Compilation of Stratigraphic Thicknesses for Caldera-Related Tertiary Volcanic Rocks, East-Central Nevada and West-Central Utah

Metadata also available as

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Sweetkind, D.S.

Originator: du Bray, E. A.

Publication_Date: 2007

Title:

Compilation of Stratigraphic Thicknesses for Caldera-Related Tertiary Volcanic Rocks, East-Central Nevada and West-Central Utah

Edition: 1.0

Geospatial_Data_Presentation_Form: raster digital data

Series_Information:

Series_Name: Data Series
Issue_Identification: 271

Publication_Information:

Publication_Place: Denver, Colorado
Publisher: U.S. Geological Survey

Online_Linkage: <https://pubs.usgs.gov/ds/271>

Description:

Abstract:: Published isopach maps for most of the major, regionally distributed ash-flow tuffs of east-central Nevada and west-central Utah were obtained. Paper maps at a variety of scales were scanned and geo-referenced in a Geographic Information System (GIS) and the location and thickness values as measured at outcrops of individual tuffs were digitized from these published maps. In order to preserve the original author's interpreted contour patterns, additional thickness data were created by digitizing a regular series of points along each contour line of the isopach maps. For each tuff, these thickness data were gridded as 2500-m square cells within the GIS to produce a digital thickness grid as raster data sets. Thickness was gridded using either inverse distance or simple kriging algorithms; the gridding methodology was chosen on the basis of how closely the digital grid resembled the original published contour map. Grids were locally hand-edited in order to recreate abrupt thickness changes at known or inferred caldera boundaries. Using this approach, digital thickness grids were created for the following ash-flow tuffs; the geologic unit name is followed by the feature data set name in the geodatabase: the Kalamazoo Tuff (kalam_ipach), the Windous Butte Formation (windous_ipach), the Monotony Tuff (monot_ipach), the Shingle Pass Tuff (shingle_ipach), the Cottonwood Wash Tuff (cotton_ipach), the Wah Wah Springs Formation (wahwah_ipach), the Lund Formation (lund_ipach), the Isom Formation (isom_ipach), the Leach Canyon Formation (leach_ipach), the Condor Canyon Formation (condor_ipach), and the Harmony Hills Tuff (harmony_ipach). The thickness values from these individual isopach maps were summed using grid addition to produce a composite isopach that combines the gridded thickness for all of the above units (ipach_volcs).
Purpose:: These data were developed provide a general understanding of the distribution and thickness of Tertiary ash-flow tuffs within intermontane basins in east-central Nevada and western Utah. Proposed ground-water development in White Pine County, Nevada, and adjacent areas in Nevada and Utah could impact water accumulations in three general types of aquifer materials: consolidated Paleozoic carbonate bedrock, and basin-filling Cenozoic volcanic rocks and unconsolidated Quaternary sediments. At present, the full impact of extracting ground-water from any or all of these potential, valley graben reservoirs is not fully understood. A thorough understanding of intermontane basin stratigraphy, mostly concealed by the youngest unconsolidated deposits that blanket the surface in these valleys, is critical to an understanding of the regional hydrology in this area. This data set is a literature-based compilation of geologic data, especially thicknesses and lithologic characteristics, for Tertiary volcanic rocks that are presumably present in the subsurface of the intermontane valleys that are prominent features of this area.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 2007

Currentness_Reference: publication date

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -117.020538
East_Bounding_Coordinate: -111.603986
North_Bounding_Coordinate: 40.121566
South_Bounding_Coordinate: 36.742625

Keywords:

Theme:

Theme_Keyword_Thesaurus: American Geological Institute Thesarus
Theme_Keyword: Isopach
Theme_Keyword: Ash-flow tuff
Theme_Keyword: Tertiary

Place:

Place_Keyword_Thesaurus: Geographic Names Inventory System
Place_Keyword: Nevada
Place_Keyword: Utah
Place_Keyword: USA

Access_Constraints: None

Use_Constraints:

Acknowlegment of the U.S. Geological Survey would be appropriate in products derived from these data.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: U.S. Geological Survey
Contact_Person: Donald Sweetkind

Contact_Position: Research Geologist

Contact_Address:

Address_Type: mailing and physical address
Address: Box 25046, MS 973, U.S Geological Survey
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA

Contact_Voice_Telephone: 303-236-1828

Contact_Facsimile_Telephone: 303-236-3200

Contact_Electronic_Mail_Address: dsweetkind@usgs.gov

Security_Information:

Security_Classification_System: None
Security_Classification: Unclassified
Security_Handling_Description: None

Native_Data_Set_Environment:

Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350

Data_Quality_Information:

Logical_Consistency_Report:

No tests for logical consistency have been performed on this rster catalog dataset.

Completeness_Report:

The raster data set was computer-generated by Sweetkind and others (2006). The data set is complete and is not anticipated to change.

Lineage:

Process_Step:

Process_Description:

Published isopach maps for most of the major, regionally distributed ash-flow tuffs of east-central Nevada and west-central Utah were obtained. Paper maps at a variety of scales were scanned and geo-referenced in a Geographic Information System (GIS) and the location and thickness values as measured at outcrops of individual tuffs were digitized from these published maps. In order to preserve the original author's interpreted contour patterns, additional thickness data were created by digitizing a regular series of points along each contour line of the isopach maps. For each tuff, these thickness data were gridded as 2500-m square cells within the GIS to produce a digital thickness grid as raster data sets. Thickness was gridded using either inverse distance or simple kriging algorithms; the gridding methodology was chosen on the basis of how closely the digital grid resembled the original published contour map. Grids were locally hand-edited in order to recreate abrupt thickness changes at known or inferred caldera boundaries. Using this approach, digital thickness grids were created for the following ash-flow tuffs; the geologic unit name is followed by the feature data set name in the geodatabase: the Kalamazoo Tuff (kalam_ipach), the Windous Butte Formation (windous_ipach), the Monotony Tuff (monot_ipach), the Shingle Pass Tuff (shingle_ipach), the Cottonwood Wash Tuff (cotton_ipach), the Wah Wah Springs Formation (wahwah_ipach), the Lund Formation (lund_ipach), the Isom Formation (isom_ipach), the Leach Canyon Formation (leach_ipach), the Condor Canyon Formation (condor_ipach), and the Harmony Hills Tuff (harmony_ipach). The thickness values from these individual isopach maps were summed using grid addition to produce a composite isopach that combines the gridded thickness for all of the above units (ipach_volcs).

Process_Date: 2007

Process_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Donald Sweetkind
Contact_Organization: U.S. Geological Survey

Contact_Position: Research Geologist

Contact_Address:

Address_Type: mailing address
Address: Box 25046, MS 973, U.S Geological Survey
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: USA

Contact_Voice_Telephone: 303-236-1828

Contact_Facsimile_Telephone: 303-236-3200

Contact_Electronic_Mail_Address: dsweetkind@usgs.gov

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Raster

Raster_Object_Information:

Raster_Object_Type: Grid Cell
Row_Count: 145
Column_Count: 185

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Grid_Coordinate_System:

Grid_Coordinate_System_Name: Universal Transverse Mercator

Universal_Transverse_Mercator:

UTM_Zone_Number: 11

Transverse_Mercator:

Scale_Factor_at_Central_Meridian: 0.999600
Longitude_of_Central_Meridian: -117.000000
Latitude_of_Projection_Origin: 0.000000
False_Easting: 500000.000000
False_Northing: 0.000000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 0.000215
Ordinate_Resolution: 0.000215

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983
Ellipsoid_Name: Geodetic Reference System 80
Semi-major_Axis: 6378137.000000
Denominator_of_Flattening_Ratio: 298.257222

Vertical_Coordinate_System_Definition:

Altitude_System_Definition:

Altitude_Datum_Name: North American Vertical Datum of 1988
Altitude_Resolution: 0.000001
Altitude_Distance_Units: meters
Altitude_Encoding_Method:: Explicit elevation coordinate included with horizontal coordinates

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: Isopach
Entity_Type_Definition:: Estimated stratigraphic thicknesses of Tertiary ash-flow tuffs of east-central Nevada and western Utah derived from published thickness (isopach) maps for individual ash-flow tuffs
Entity_Type_Definition_Source: ESRI ARCGIS 9.1

Attribute:

Attribute_Label: OBJECTID

Attribute_Definition: Internal feature number.

Attribute_Definition_Source: ESRI