Identification_Information:
Citation:
Citation_Information:
Originator: P.K. Sims
Originator: Karen Lund
Originator: E. Anderson
Publication_Date: 2005
Title: Precambrian crystalline basement map of Idaho--An interpretation of
aeromagnetic anomalies
Edition: version 1.0
Geospatial_Data_Presentation_Form: map
Series_Information:
Series_Name: USGS Scientific Investigations Map
Issue_Identification: Scientific Investigations Map 2884
Publication_Information:
Publication_Place: Denver, Colorado, U.S.A.
Publisher: United States Geological Survey
Online_Linkage: http://pubs.usgs.gov/sim/2005/2884
Description:
Abstract:
Idaho lies within the northern sector of the U.S. Cordillera astride the
boundary between the Proterozoic continent (Laurentia) to the east and
the Permian to Jurassic accreted terranes to the west. The continental
basement is mostly covered by relatively undeformed Mesoproterozoic
metasedimentary rocks and intruded or covered by Phanerozoic igneous
rocks; accordingly, knowledge of the basement geology is poorly
constrained. Incremental knowledge gained since the pioneering studies
by W. Lindgren, C.P. Ross, A.L. Anderson, A. Hietanen, and others during
the early- and mid-1900's has greatly advanced our understanding of the
general geology of Idaho. However, knowledge of the basement geology
remains relatively poor, partly because of the remoteness of much of the
region plus the lack of a stimulus to decipher the complex assemblage of
high-grade gneisses and migmatite of central Idaho. The availability of
an updated aeromagnetic anomaly map of Idaho (North American Magnetic
Anomaly Group, 2002) provides a means to determine the regional
Precambrian geologic framework of the State. The combined geologic and
aeromagnetic data permit identification of previously unrecognized
crystalline basement terranes, assigned to Archean and Paleoproterozoic
ages, and the delineation of major shear zones, which are expressed in
the aeromagnetic data as linear negative anomalies (Finn and Sims,
2004). Limited geochronologic data on exposed crystalline basement
aided by isotopic studies of zircon inheritance, particularly Bickford
and others (1981) and Mueller and others (1995), provide much of the
geologic background for our interpretation of the basement geology. In
northwestern United States, inhomogeneities in the basement inherited
from Precambrian tectogenesis controlled many large-scale tectonic
features that developed during the Phanerozoic. Two basement
structures, in particular, provided zones of weakness that were
repeatedly rejuvenated: (1) northeast-trending ductile shear zones
developed on the northwest margin of the Archean Wyoming province during
the Paleoproterozoic Trans-Montana orogeny (Sims and others, 2004), and
(2) northwest-trending intra-continental faults of the Mesoproterozoic
Trans-Rocky Mountain strike-slip fault system (Sims, unpub. data, 2003).
In this report, geologic ages are reported in millions of years (Ma) and
generalized ages are given in billions of years (Ga). The subdivision
of Precambrian rocks used herein is the time classification recommended
by the International Union of Geological Sciences (Plumb, 1991).
Purpose:
This ARC/INFO dataset was developed to provide a geologic map GIS database
of the Precambrian basement of Idaho for use in spatial analysis by a
variety of users.
Supplemental_Information:
Shapefiles included in this geospatial database:
id_contacts: line shapefile of geologic contacts
id_faults: line shapefile of geologic faults
id_rocks: polygon shapefile of geologic units
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 2005
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: none currently planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -117.487884
East_Bounding_Coordinate: -110.703864
North_Bounding_Coordinate: 49.033439
South_Bounding_Coordinate: 41.949861
Keywords:
Theme:
Theme_Keyword_Thesaurus: American Geological Institute Glossary of
Geology
Theme_Keyword: aeromagnetic anomalies
Theme_Keyword: Archean
Theme_Keyword: basement
Theme_Keyword: batholiths
Theme_Keyword: intrusions
Theme_Keyword: mapping
Theme_Keyword: tectonics
Place:
Place_Keyword_Thesaurus: Board of Geographic Names
Place_Keyword: Idaho
Place_Keyword: Snake River
Place_Keyword: Salmon River
Place_Keyword: Rocky Mountains
Access_Constraints: None
Use_Constraints: None. Acknowledgment of the U.S. Geological Survey would
be appreciated in products derived from these data.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Eric Anderson
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: MS 964, Box 25046 DFC
City: Denver
State_or_Province: CO
Postal_Code: 80225-0046
Country: USA
Contact_Voice_Telephone: 303-236-5652
Contact_Facsimile_Telephone: 303-236-1425
Contact_Electronic_Mail_Address: ericanderson@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
http://pubs.usgs.gov/sim/2884/2884.pdf
Browse_Graphic_File_Description: graphic representation of map layout
Browse_Graphic_File_Type: PDF
Data_Set_Credit: Eric Anderson, U.S. Geological Survey, served as GIS
coordinator in the creation of the GIS database. Alex J. Donatich, U.S.
Geological Survey, assisted in proofing the geology and correcting the GIS
database.
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 1
ESRI ArcCatalog 9.0.0.535
Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
The database consists of newly generated data that were compiled on mylar
and then digitized in ARC/INFO. This map was thoroughly reviewed for
conformity with U.S. Geological Survey editorial standards and
stratigraphic nomenclature.
Logical_Consistency_Report:
Map elements were visually checked by the authors and editor for overshoots,
undershoots, duplicate features, polygon attributes, and other errors.
Automated (ARC/INFO) routines were also used to check the databases for
polygon label errors and dangling arcs. The coverages were cleaned in
ARC/INFO to ensure logical consistency that is topologically clean. The map
was reviewed by other geologists for consistency with basic geologic
principles and general conformity to USGS mapping standards.
Completeness_Report:
This dataset is complete and includes the spatial coverages pertaining to
the geologic map.
Lineage:
Process_Step:
Process_Description: Paul Sims compiled the geology. Eric Anderson
digitized the geology. The digital database was quality checked by Alex
J. Donatich. The layout of the finished paper map was prepared by Alex
J. Donatich and checked by Paul Sims and Karen Lund.
Process_Date: 2004-2005
Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Planar:
Map_Projection:
Map_Projection_Name: Lambert Conformal Conic
Lambert_Conformal_Conic:
Standard_Parallel: 33.000000
Standard_Parallel: 45.000000
Longitude_of_Central_Meridian: -114.000000
Latitude_of_Projection_Origin: 39.000000
False_Easting: 0.000000
False_Northing: 0.000000
Planar_Coordinate_Information:
Planar_Coordinate_Encoding_Method: coordinate pair
Coordinate_Representation:
Abscissa_Resolution: 0.002048
Ordinate_Resolution: 0.002048
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
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
The data are supplied in ArcView shapefile format.
>Attribution of user-defined item ARC_TYPE in id_contacts.aat:
>contact coincident with fault
>contact, certain
>contact, uncertain
>map boundary
>Attribution of user-defined item FAULT_TYPE in id_faults.aat:
>strike-slip fault, certain
>strike-slip fault, inferred
>thrust fault, certain
>thrust fault, inferred
>Attribution of user-defined item UNIT in id_rocks.pat:
>Aggn
>Agn
>Ap
>Apg
>JP
>PzY
>XAg
>XAr
>Xa
>Xw
>Xwv
Entity_and_Attribute_Detail_Citation: none
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Central Publications Group
Address: MS 902, Box 25046
Address: Denver Federal Center
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: (888)ASK-USGS
Contact_Electronic_Mail_Address: webmaster@geology.cr.usgs.gov
Distribution_Liability:
The U.S. Geological Survey (USGS) provides these geographic data "as is".
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 these data have been processed
successfully on computers at the USGS, no warranty, expressed or implied, is
made by the USGS regarding the use of these data on any other system, nor
does the fact of distribution constitute or imply any such warranty.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ArcView shapefile formats
Format_Version_Number: ArcInfo version 9.0
File_Decompression_Technique:
.tar.gz - UNIX gzip-compressed TAR file - use GNU zip and TAR to
extract
.ZIP - Windows ZIP archive - use Winzip, PKZip, or similar to extract
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
Fees: None
Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U.S.Geological Survey
Contact_Address:
Address_Type: mailing address
Address: USGS Information Services
Address: Box 25286
City: Denver
State_or_Province: CO
Postal_Code: 80225
Country: United States
Contact_Voice_Telephone: 1-888-ASK-USGS
Resource_Description: Scientific Investigations Map 2884 (plot-on-demand)
Distribution_Liability: none
Standard_Order_Process:
Non-digital_Form:
Available as one printed sheet. Order from USGS at the address listed
above or see for more
ordering information.
Fees:
For current prices please see
Metadata_Reference_Information:
Metadata_Date: 20050418
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Eric Anderson
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: Denver Federal Center, MS 964
Address: Box 25046
City: Denver
State_or_Province: Colorado
Postal_Code: 80225
Country: USA
Contact_Voice_Telephone: (303) 236-5652
Contact_Electronic_Mail_Address: ericanderson@usgs.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: None
Metadata_Use_Constraints: None