Stream-Sediment Samples Reanalyzed for Major, Rare Earth, and Trace Elements from Seven 1:250,000-Scale Quadrangles, South-Central Alaska, 2007–09

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What does this data set describe?

1. How should this data set be cited?

   Gamble, B.M., Bailey, E.A., Schmidt, J.M., Shew, N.B., Labay, K.A., Granitto, Matthew, O’Leary, R.M., and Detra, D.E., 2010, Stream-sediment samples reanalyzed for major, rare earth, and trace elements from seven 1:250,000-scale quadrangles, south-central Alaska, 2007–09: U.S. Geological Survey Data Series 532, 4 p.

   Online Links:

   • <https://pubs.usgs.gov/ds/532/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -156.000

   East_Bounding_Coordinate: -150.000

   North_Bounding_Coordinate: 63.000

   South_Bounding_Coordinate: 59.400

3. What does it look like?

   <https://pubs.usgs.gov/ds/532/pdf/plate01.pdf> (PDF (Portable Document Format))

   Map showing locations of 1,075 stream-sediment samples in seven 1:250,000-scale quadrangles in west-central Alaska, with inset enlargement of an area having a high concentrations of sample locations.

4. Does the data set describe conditions during a particular time period?

   Beginning_Date: 2007

   Ending_Date: 2009

   Currentness_Reference: years in which samples were analyzed

5. What is the general form of this data set?

   Geospatial_Data_Presentation_Form: tabular data

6. How does the data set represent geographic features?
   1. How are geographic features stored in the data set?

      This is a point data set. It contains the following vector data types (SDTS terminology):

      • Entity point

   2. What coordinate system is used to represent geographic features?

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.001 degrees. Longitudes are given to the nearest 0.001 degrees. Latitude and longitude values are specified in Decimal degrees.

      The horizontal datum used is North American Datum of 1927 (NAD27).
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
      

7. How does the data set describe geographic features?

   ds532_appendix_a.xls, ds532_appendix_a.xlsx, ds532_appendix_a.ods, ds532_appendix_a.dbf, ds532_appendix_a.csv

   This table contains analytical data for 1,075 stream-sediment samples. The fields (columns) consist of sample identification, location, and analytical information for each sample. (Source: U.S. Geological Survey)

   Map No.

   Unique identification number assigned by the authors to make reading the location figure easier. These numbers correspond to the sample location labels shown on plate1.pdf. (Source: U.S. Geological Survey, Nora B. Shew, Anchorage, AK - coauthor)

   Range of values
   Minimum:	1
   Maximum:	1,075

   New Lab No.

   Each sample submitted for analyses is assigned a unique ID number by the USGS that is integrated with the USGS laboratory information storage system (LIMS) prior to submitting to a laboratory. (Source: U.S. Geological Survey, Richard M. O'Leary, Denver, CO)

   Alphanumeric data without scientific significance. Each value is assigned by the USGS/LIMS at the time of submittal and is unique.

   Field_No.

   Field number assigned by the submitter. (Source: U.S. Geological Survey)

   Alphanumeric data without scientific significance. Each value assigned by the submitter is unique.

   Previous Job No.

   Assigned by the USGS. Samples are submitted by the USGS to a laboratory in jobs (groups) of samples. Each group of samples submitted for analyses is assigned a unique job number. (Source: U.S. Geological Survey, Richard M. O'Leary, Denver, CO)

   Alphanumeric data without scientific significance. Each value assigned by the USGS prior to submitting to a laboratory is unique to the group of samples submitted together. These values were assigned when the samples were originally submitted for preparation and analyses. The scheme used for Job No. has varied with time; some values are numeric and some values are combinations of letters and numbers.

   Latitude

   North latitude of sample site reported in decimal degrees. (NAD27, Clarke 1866) (Source: U.S. Geological Survey)

   Range of values
   Minimum:	59.415
   Maximum:	62.998
   Units:	decimal degrees

   Longitude

   West longitude of sample site reported in negative decimal degrees. (NAD27, Clarke 1866) (Source: U.S. Geological Survey)

   Range of values
   Minimum:	-155.979
   Maximum:	-150.011
   Units:	decimal degrees

   1:250,000-scale quadrangle

   Name of the 1:250,000-scale quadrangle in which the sample was collected. (Source: U.S. Geological Survey)

   Text field.

   HGAAS As_ppm

   Concentration of arsenic in stream-sediment samples; determined by hydride generation atomic absorption spectrometry (HGAAS) (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#M9>)

   Value	Definition
   <0.6	below the lower limit of detection (0.6 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.6
   Maximum:	2,520
   Units:	ppm (parts per million)

   FA/ICP_MS Au_ppb

   Concentration of gold in stream-sediment samples; determined by fire assay with inductively coupled plasma_mass spectrometry finish (FA/ICP-MS) (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m20>)

   Value	Definition
   <1	below the lower limit of detection (1 ppb)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	5,990
   Units:	ppb (parts per billion)

   FA/ICP_MS Pd_ppb

   Concentration of palladium in stream-sediment samples; determined by fire assay with inductively coupled plasma_mass spectrometry finish (FA/ICP-MS) (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m20>)

   Value	Definition
   <1	below the lower limit of detection (1 ppb)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	15
   Units:	ppb (parts per billion)

   FA/ICP_MS Pt_ppb

   Concentration of platinum in stream-sediment samples; determined by fire assay with inductively coupled plasma_mass spectrometry finish (FA/ICP-MS) (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m20>)

   Value	Definition
   <0.5	below the lower limit of detection (1 ppb)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.5
   Maximum:	28.3
   Units:	ppb (parts per billion)

   ICPAES_MS55 Al_%

   Concentration of aluminum in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.01
   Maximum:	12.1
   Units:	% (percent)

   ICPAES_MS55 Ca_%

   Concentration of calcium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, Survey, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.01	below the lower limit of detection (0.01%)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.01
   Maximum:	29.6
   Units:	% (percent)

   ICPAES_MS55 Fe_%

   Concentration of iron in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.01	below the lower limit of detection (0.01%)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.01
   Maximum:	17.9
   Units:	% (percent)

   ICPAES_MS55 K_%

   Concentration of potassium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.01	below the lower limit of detection (0.01%)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.01
   Maximum:	5.47
   Units:	% (percent)

   ICPAES_MS55 Mg_%

   Concentration of magnesium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.01	below the lower limit of detection (0.01%)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.01
   Maximum:	5.47
   Units:	% (percent)

   ICPAES_MS55 Mn_%

   Concentration of manganese in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.01	below the lower limit of detection (0.01%)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.01
   Maximum:	0.66
   Units:	% (percent)

   ICPAES_MS55 P_%

   Concentration of phosphorus in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.01	below the lower limit of detection (0.01%)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.01
   Maximum:	0.48
   Units:	% (percent)

   ICPAES_MS55 Ti_%

   Concentration of titanium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.03
   Maximum:	2.19
   Units:	% (percent)

   ICPAES_MS55 Ag_ppm

   Concentration of silver in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <1	below the lower limit of detection (1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	15
   Units:	ppm (parts per million)

   ICPAES_MS55 As_ppm

   Concentration of arsenic in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <30	below the lower limit of detection (30 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	30
   Maximum:	2,510
   Units:	ppm (parts per million)

   ICPAES_MS55 Ba_ppm

   Concentration of barium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	2
   Maximum:	9,250
   Units:	ppm (parts per million)

   ICPAES_MS55 Be_ppm

   Concentration of beryllium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <5	below the lower limit of detection (5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	5
   Maximum:	9,250
   Units:	ppm (parts per million)

   ICPAES_MS55 Bi_ppm

   Concentration of bismuth in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.1	below the lower limit of detection (0.1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.1
   Maximum:	9,250
   Units:	ppm (parts per million)

   ICPAES_MS55 Cd_ppm

   Concentration of cadmium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.2	below the lower limit of detection (0.2 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.2
   Maximum:	9,250
   Units:	ppm (parts per million)

   ICPAES_MS55 Ce_ppm

   Concentration of cerium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	8.4
   Maximum:	1,530
   Units:	ppm (parts per million)

   ICPAES_MS55 Co_ppm

   Concentration of cobalt in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.5	below the lower limit of detection (0.5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.5
   Maximum:	72.5
   Units:	ppm (parts per million)

   ICPAES_MS55 Cr_ppm

   Concentration of chromium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <10	below the lower limit of detection (10 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	10
   Maximum:	1,120
   Units:	ppm (parts per million)

   ICPAES_MS55 Cs_ppm

   Concentration of cesium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.1	below the lower limit of detection (0.1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.1
   Maximum:	39.7
   Units:	ppm (parts per million)

   ICPAES_MS55 Cu_ppm

   Concentration of copper in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <5	below the lower limit of detection (5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	5
   Maximum:	3,050
   Units:	ppm (parts per million)

   ICPAES_MS55 Dy_ppm

   Concentration of dysprosium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1.22
   Maximum:	75.8
   Units:	ppm (parts per million)

   ICPAES_MS55 Er_ppm

   Concentration of erbium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.67
   Maximum:	50.2
   Units:	ppm (parts per million)

   ICPAES_MS55 Eu_ppm

   Concentration of europium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.19
   Maximum:	6.10
   Units:	ppm (parts per million)

   ICPAES_MS55 Ga_ppm

   Concentration of gallium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	3
   Maximum:	31
   Units:	ppm (parts per million)

   ICPAES_MS55 Gd_ppm

   Concentration of gadollinium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1.00
   Maximum:	61.7
   Units:	ppm (parts per million)

   ICPAES_MS55 Ge_ppm

   Concentration of germanium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <1	below the lower limit of detection (1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	60
   Units:	ppm (parts per million)

   ICPAES_MS55 Hf_ppm

   Concentration of hafnium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.2	below the lower limit of detection (0.2 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	136
   Units:	ppm (parts per million)

   ICPAES_MS55 Ho_ppm

   Concentration of holmium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.23
   Maximum:	16.6
   Units:	ppm (parts per million)

   ICPAES_MS55 In_ppm

   Concentration of indium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.2	below the lower limit of detection (0.2 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.2
   Maximum:	1.2
   Units:	ppm (parts per million)

   ICPAES_MS55 La_ppm

   Concentration of lanthanum in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	4.1
   Maximum:	762
   Units:	ppm (parts per million)

   ICPAES_MS55 Li_ppm

   Concentration of lithium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <10	below the lower limit of detection (10 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	10
   Maximum:	180
   Units:	ppm (parts per million)

   ICPAES_MS55 Lu_ppm

   Concentration of lutetium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.06
   Maximum:	6.94
   Units:	ppm (parts per million)

   ICPAES_MS55 Mo_ppm

   Concentration of molybdenum in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <2	below the lower limit of detection (2 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	2
   Maximum:	37
   Units:	ppm (parts per million)

   ICPAES_MS55 Nb_ppm

   Concentration of niobium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <1	below the lower limit of detection (1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	101
   Units:	ppm (parts per million)

   ICPAES_MS55 Nd_ppm

   Concentration of neodymium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	5.4
   Maximum:	650
   Units:	ppm (parts per million)

   ICPAES_MS55 Ni_ppm

   Concentration of nickel in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <5	below the lower limit of detection (5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	5
   Maximum:	1,180
   Units:	ppm (parts per million)

   ICPAES_MS55 Pb_ppm

   Concentration of lead in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <5	below the lower limit of detection (5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	5
   Maximum:	683
   Units:	ppm (parts per million)

   ICPAES_MS55 Pr_ppm

   Concentration of praeseodymium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1.17
   Maximum:	179
   Units:	ppm (parts per million)

   ICPAES_MS55 Rb_ppm

   Concentration of rubidium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1.9
   Maximum:	296
   Units:	ppm (parts per million)

   ICPAES_MS55 Sb_ppm

   Concentration of anitmony in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.1	below the lower limit of detection (0.1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.1
   Maximum:	97
   Units:	ppm (parts per million)

   ICPAES_MS55 Sc_ppm

   Concentration of scandium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <5	below the lower limit of detection (5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	5
   Maximum:	32
   Units:	ppm (parts per million)

   ICPAES_MS55 Sm_ppm

   Concentration of samarium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1.0
   Maximum:	92.4
   Units:	ppm (parts per million)

   ICPAES_MS55 Sn_ppm

   Concentration of tin in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <1	below the lower limit of detection (1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	101
   Units:	ppm (parts per million)

   ICPAES_MS55 Sr_ppm

   Concentration of strontium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.4
   Maximum:	1,860
   Units:	ppm (parts per million)

   ICPAES_MS55 Ta_ppm

   Concentration of tantalum in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.5	below the lower limit of detection (0.5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.5
   Maximum:	7.2
   Units:	ppm (parts per million)

   ICPAES_MS55 Tb_ppm

   Concentration of terbium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.19
   Maximum:	11.6
   Units:	ppm (parts per million)

   ICPAES_MS55 Th_ppm

   Concentration of thorium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.4
   Maximum:	260
   Units:	ppm (parts per million)

   ICPAES_MS55 Tl_ppm

   Concentration of thallium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <0.5	below the lower limit of detection (0.5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.5
   Maximum:	2.3
   Units:	ppm (parts per million)

   ICPAES_MS55 Tm_ppm

   Concentration of thulium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.08
   Maximum:	7.59
   Units:	ppm (parts per million)

   ICPAES_MS55 U_ppm

   Concentration of uranium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.20
   Maximum:	286
   Units:	ppm (parts per million)

   ICPAES_MS55 V_ppm

   Concentration of vanadium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <5	below the lower limit of detection (5 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	5
   Maximum:	627
   Units:	ppm (parts per million)

   ICPAES_MS55 W_ppm

   Concentration of tungsten in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   <1	below the lower limit of detection (1 ppm)
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	1
   Maximum:	162
   Units:	ppm (parts per million)

   ICPAES_MS55 Y_ppm

   Concentration of yttrium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	6.9
   Maximum:	453
   Units:	ppm (parts per million)

   ICPAES_MS55 Yb_ppm

   Concentration of ytterbium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	0.6
   Maximum:	47.7
   Units:	ppm (parts per million)

   ICPAES_MS55 Zn_ppm

   Concentration of zinc in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	11
   Maximum:	2,330
   Units:	ppm (parts per million)

   ICPAES_MS55 Zr_ppm

   Concentration of zirconium in stream-sediment samples; determined by inductively coupled plasma atomic emission spectrometry or mass spectrometry (ICP-AES-MS) following sodium peroxide sinter at 450 degrees Celsius (Source: U.S. Geological Survey, Central Mineral and Environmental Resources Science Center (CMERSC) Analytical Chemistry, David E. Detra, Denver, CO and <http://minerals.cr.usgs.gov/projects/analytical_chem/references.html#m22>)

   Value	Definition
   ins	insufficient sample material for analysis

   Range of values
   Minimum:	27
   Maximum:	4,750
   Units:	ppm (parts per million)

   Entity_and_Attribute_Overview:

   This report has one entity (table) with attributes that are defined in the "Entity_and_Attribute_Information Detailed_Description" section.
   The table is as follows:
   ds532_appendix_a: sample locations, descriptions, and geochemical data for 1,075 samples from 10 1:250,000-scale quadrangle in south-central Alaska

   Entity_and_Attribute_Detail_Citation: This report

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Gamble, Bruce M.
   • Bailey, Elizabeth A.
   • Schmidt, Jeanine M.
   • Shew, Nora B.
   • Labay, Keith A.
   • Granitto, Matthew
   • O'Leary, Richard M.
   • Detra, David E.

2. Who also contributed to the data set?

   Matthew Granitto: USGS, Denver, CO, USGS National Geochemical Database (NGDB) organization and maintenance; Steven M. Smith: USGS, Denver, CO, USGS NGDB project leader; David E. Detra: USGS Denver, CO, Analytical chemistry methods information, analytical data quality assurance and control, contract chemistry manager; Richard M. O'Leary: USGS Denver, CO, Analytical chemistry methods information, analytical data quality assurance and control, sample preparation oversight; Peter Hauessler: technical reviewer; Tim Brabets: technical reviewer; Theresa Taylor: metadata reviewer

3. To whom should users address questions about the data?
   Gamble, Bruce M.
   U.S. Geological Survey, Alaska Science Center
   Research Geologist
   4210 University Drive
   Anchorage, Alaska 99508-4626
   United States of America
   

   1-907-786-7479 (voice)
   1-907-786-7401 (FAX)
   bgamble@usgs.gov
   

Why was the data set created?

In preparation for future mineral resource assessments some of those original samples (about 6 percent) were selected for reanalysis because recently developed analytical methods can detect additional elements of interest and have lower detection limits than the methods used when these samples were originally analyzed. These samples were reanalyzed to determine if the original analyses are adequate for a regional-scale mineral resource assessment, to determine if the original data are adequate to establish regional-scale baselines for elements of interest, and to incorporate additional analyses of elements, such as platinum (Pt), palladium (Pd), and rare earth elements (REE).

How was the data set created?

1. From what previous works were the data drawn?

2. How were the data generated, processed, and modified?

   Date: 06-May-2010 (process 1 of 1)

   1. One thousand seventy five stream-sediment samples that were previously collected in west-central Alaska by several USGS scientists were retrieved from the USGS sample storage archive in Building 810 at the Denver Federal Center and chemically analyzed. All samples were analyzed for As by hydride generation atomic absorption spectrometry (HGAAS), for Au, Pd, and Pt by inductively coupled plasma-mass spectrometry after fire assay separation (FA/ICP_MS), and for a suite of 55 major, rare earth, and trace elements by inductively coupled plasma-atomic emission spectrometry and inductively coupled plasma-mass spectrometry (ICP-AES-MS).
   
   2. Location and analytical data were compiled in spreadsheet form (table2.xls). Columns (fields) containing numeric data such as latitude, longitude, and analytical data were formatted as numeric fields and saved.

3. What similar or related data should the user be aware of?

   Bailey, E.A., Shew, N.B., Labay, K.A., Schmidt, J.M., O’Leary, R.M., and Detra, D.E., 2010, Stream-sediment samples reanalyzed for major, rare earth, and trace elements from ten 1:250,000-scale quadrangles, south-central Alaska, 2007–08: U.S. Geological Survey Open-File Report 2010–1147, 6 p.

   Online Links:

   • <https://pubs.usgs.gov/of/2010/1147/>

How reliable are the data; what problems remain in the data set?

1. How well have the observations been checked?

   The analytical methods used to generate the data in this report were selected by the authors. The accuracy of the data varies with the analytical methodology and with the concentration of the element being analyzed. Please see USGS Open-File Report 02-0223 (<https://pubs.usgs.gov/of/2002/ofr-02-0223/>) and the USGS Mineral Resources Program Contract Laboratory Method Summaries web site (<http://minerals.cr.usgs.gov/projects/analytical_chem/references.html>) for specific details on the sample preparation and analytical methods used for this report.

2. How accurate are the geographic locations?

   Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitude and longitude values are specified in decimal degrees. The original sample location data were recorded in a variety of formats (decimal degrees, degrees plus decimal minutes, degrees-minutes-seconds). Most of the coordinates were originally determined in the field using clear mylar graticules overlaid on a paper 1:63,360-scale topographic base maps in degrees, minutes, and seconds or in the office using a tablet digitizer. When submitters reported locations as degrees, minutes, and seconds of latitude and longitude the accuracy should be within a few seconds or about 200 feet.
   The horizontal datum used is North American Datum of 1927. The ellipsoid used is Clarke 1866.

3. How accurate are the heights or depths?

4. Where are the gaps in the data? What is missing?

   Samples to be reanalyzed were randomly selected from 10 x 10 km (6.2 x 6.2 mi) grid cells that we overlaid on the study area to ensure a relatively even sample distribution. When available, two samples were selected from each cell. Archived material sufficient for re-analysis was not available for all samples initially selected. When possible, new selections were made in an attempt to continue to have two samples from each cell.
   The selected samples were reanalyzed to determine if the original analyses are adequate for regional-scale mineral resource assessment, if the original data are adequate to determine regional-scale baselines for elements of interest, and to incorporate additional analyses such as platinum and palladium and rare earth elements (REE). Original analyses, many of which are by semiquantitative methods, may be found in the Rock Analysis and Storage System (RASS) component of the National Geochemical Database (NGDB), but are not included in this dataset.
   
   The geographic extent of this area includes the Iliamna, Lake Clark, Lime Hills, McGrath, Seldovia, Talkeetna, and Tyonek 1:250,000-scale quadrangles in Alaska. All of the 1,075 samples retrieved from the Building 810 archive at the Denver Federal Center for this report were reanalyzed for As by hydride generation atomic absorption spectrometry (HGAAS), and for a suite of 55 major, rare earth, and trace elements by inductively coupled plasma-atomic emission spectrometry and inductively coupled plasma-mass spectrometry (ICP-AES-MS). Most of these samples were also reanalyzed for Au, Pd, and Pt by inductively coupled plasma-mass spectrometry after fire assay separation (FA/ICP_MS) however several samples did not contain enough material (30 g.) to be analyzed. These samples are noted in the data table with "ins" in the fields (columns) for Au, Pd, and Pt.
   
   All sample analyses were completed in 2007-2009 at a laboratory under contract to the USGS. Contract laboratory oversight, data entry into the USGS National Geochemical Database, and analytical data QA/QC are managed by David E. Detra, David L. Fey, and Richard M. O'Leary at the USGS in Denver, CO.
   
   This report consists of 4 files. The first PDF file (ds532.pdf) contains introductory and explanatory text and a table with the upper and lower reporting limits for each element analyzed by the various analytical methods used for this data set.
   The second file is a PDF (ds532_plate01.pdf) image showing the location of the 1,075 stream-sediment samples reanalyzed for this report.
   The other two files contain the sample identification, location, and analytical data for each sample reported. This data is available in five formats: spreadsheet (ds532_appendix_a.xls, ds532_appendix_a.xlsx, ds532_appendix_a.ods), database (ds532_appendix_a.dbf), and ASCII (ds532_appendix_a.csv). The location coordinate and analytical data fields were formatted as numeric fields in MS Excel to preserve the formatting when converted to the database format.
   
   Abreviations used in the data tables (ds532_appendix_a.xls, ds532_appendix_a.csv, ds532_appendix_a.dbf, ds532_appendix_a.xlsx, ds532_appendix_a.ods):
   HGAAS: hydride genration atomic absorption spectrometry
   FA/ICP_MS: fire assay with inductively coupled plasma-mass spectrometry finish
   ICPAES_MS: inductively coupled plasma-atomic emission spectrometry or inductively coupled plasma-mass spectrometry
   ppm: parts per million
   ppb: parts per billion
   %: percent
   <: less than the indicated lower limit of detection for the element as determined by the analytical method used
   ins: insufficient sample for analysis

5. How consistent are the relationships among the observations, including topology?

   All of the location coordinate and analytical data fields have been formatted as numeric fields. Maximum and minimum values were calculated to insure that valid results were reported for each analytical value; that is all values are greater than zero (0) and not less than the element lower reporting limit for each analytical method. Latitude/Longitude coordinates were checked to insure they plotted in the correct 1:250,000-scale quadrangle.

How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints: None

Use_Constraints: None

1. Who distributes the data set? (Distributor 1 of 1)
   USGS Information Services
   Box 25286, Denver Federal Center
   Denver, CO 80225-0046
   United States
   

   1-888-ASK-USGS (1-888-275-8747) (voice) (voice)
   1-303-202-4695 (FAX) (FAX)
   infoservices@usgs.gov
   

2. What's the catalog number I need to order this data set?

   USGS Data Series 532

3. What legal disclaimers am I supposed to read?

   The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although this data has been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of this data on any other system, nor does the fact of distribution constitute or imply any such warranty. In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by the USGS

4. How can I download or order the data?
   • Availability in digital form:

     Data format:	tabular data with sample identification, location information, and chemical analyses of stream-sediment samples in format XLS, XLSX, ODS, DBF, and CSV (version MS Excel 2003; MS Excel 2007; OpenDocument Spreadsheet (OpenOffice.org Calc); dBase IV; ASCII comma separated values)
     Network links:	<https://pubs.usgs.gov/ds/532/data/ds532_metadata.zip>

     Data format:	report text and sample location plate in format PDF
     Network links:	<https://pubs.usgs.gov/ds/532/data/ds532_metadata.zip>

   • Cost to order the data: none

   • How long will it take to get the data?

     Digital downloads: less than 30 minutes for most files

5. What hardware or software do I need in order to use the data set?

   CSV (comma separated value) files can be imported and formatted with Microsoft Excel, OpenOffice.org Calc, or other spreadsheet and text editor programs; can also be imported into ArcGIS or other geographical information system (GIS) programs

Who wrote the metadata?

Dates:

Last modified: 25-Jun-2010
Last Reviewed: 15-Jun-2010

Metadata author:

Bailey, Elizabeth A.
U.S. Geological Survey, Alaska Science Center
Research Chemist
4210 University Drive
Anchorage, Alaska 99508-4626
United States

1-907-786-7442 (voice)
1-907-786-7401 (FAX)
eabailey@usgs.gov

Metadata standard:

Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)