Basement domain map of the conterminous U.S.A. and Alaska

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Frequently anticipated questions:


What does this data set describe?

Title: Basement domain map of the conterminous U.S.A. and Alaska
Abstract:
The basement-domain map is a compilation of basement domains in the conterminous United States and Alaska designed to be used at 1:5,000,000-scale, particularly as a base layer for national-scale mineral resource assessments. Seventy-seven basement domains are represented as eighty-three polygons on the map. The domains are based on interpretations of basement composition, origin, and architecture and developed from a variety of sources. Analysis of previously published basement, lithotectonic, and terrane maps as well as models of planetary development were used to formulate the concept of basement and the methodology of defining domains that spanned the ages of Archean to the present but formed through different processes. The preliminary compilations for the study areas utilized these maps, national-scale gravity and aeromagnetic data, published and limited new age and isotopic data, limited new field investigations, and conventional geologic maps. Citation of the relevant source data for compilations and the source and types of original interpretation, as derived from different types of data, are provided in supporting descriptive text and tables.

The tectonic settings for crustal types represented in the basement domains are subdivided into constituent geologic environments and the types of primary metals endowments and deposits in them are documented. The compositions, architecture, and original metals endowments are potentially important to assessments of primary mineral deposits and to the residence and recycling of metals in the crust of the United States portion of the North American continent. The databases can be configured to demonstrate the construction of the United States through time, to identify specific types of crust, or to identify domains potentially containing metal endowments of specific genetic types or endowed with specific metals. The databases can also be configured to illustrate other purposes chosen by users.
Supplemental_Information:
Datasets in this geospatial database include "Bsmnt_CONUS_AK", the polygon feature class of basement domains, and "tbl2_Environs_Deposits", tabular data for additional geologic and deposit information. The tabular data can be joined to the polygon features using the field “Crust_Type”. The “Reference” field in both layers lists abbreviated citations; complete bibliographic citations are provided in the accompanying report, as well as a general overview of the work performed by study area.

Please note: attribute field names are truncated to 10-characters in the “shapefile” version of the geodatabase.
  1. How might this data set be cited?
    Lund, K., Box, S.E., Holm-Denoma, C.S., San Juan, C.A., Blakely, R.J., Saltus, R.W., Anderson, E.D., and DeWitt, E.H., 2014, Basement domain map of the conterminous U.S.A. and Alaska: Data Series DS-898, U.S. Geological Survey, Denver, CO.

    Online Links:

  2. What geographic area does the data set cover?
    West_Bounding_Coordinate: -169.175856663
    East_Bounding_Coordinate: -53.8303861254
    North_Bounding_Coordinate: 71.3708469789
    South_Bounding_Coordinate: 24.1423634468
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
    Calendar_Date: 2014
    Currentness_Reference:
    publication date
  5. What is the general form of this data set?
    Geospatial_Data_Presentation_Form: Vector Digital Data Set (Polygon)
  6. How does the data set represent geographic features?
    1. How are geographic features stored in the data set?
      This is a Vector data set. It contains the following vector data types (SDTS terminology):
      • G-polygon (82)
    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 0.0197137099. Longitudes are given to the nearest 0.0291450447. Latitude and longitude values are specified in Decimal seconds. The horizontal datum used is D_WGS_1984.
      The ellipsoid used is WGS_1984.
      The semi-major axis of the ellipsoid used is 6378137.0.
      The flattening of the ellipsoid used is 1/298.257223563.
  7. How does the data set describe geographic features?
    basement
    Table containing attribute information associated with the data set. (Source: Producer defined)
    region
    Names assigned to regions studied in project (Source: Authors) Generally recognized geographic regions in the U.S.A. used to designate areas for study of basement characteristics. Designation of areas based both on available data and characteristics of underlying basement.
    domain
    Name of basement domain (Source: Authors) Unique name for each identified basement domain.
    alternate
    Alternate name for basement domain (Source: Authors) Alternate name used for an identified basement domain in some published sources.
    crust_type
    Tectonic setting and type of the crust that formed the basement domain (Source: Authors) Generally accepted tectonic settings are identified as responsible for the types of crust. Descriptions for tectonic settings and types of crust are presented in text.
    crust_age
    Age of formation of crust that formed the basement domain in millions of years (Ma) or billions of years (Ga). (Source: Authors) Ages are presented for domains where specific dates represent formation events. Age ranges are presented where dating demonstrates a span of formation events. Geologic ages are presented where the time of formation is more generalized.
    accr_type
    Tectonic setting and style of growth of continental basement (Source: Authors) Descriptions for the geometry and style of accretion for individual basement domains onto previously formed or amalgamated basement are presented in text.
    accr_age
    Age of addition of new basement to previously formed continental basement in millions of years (Ma) or billions of years (Ga). (Source: Authors) Ages are presented for crustal growth where single dates represent specific events. Age ranges are presented where dating demonstrates a span of crustal growth events. Geologic ages are presented where the time of crustal growth is more generalized.
    reflinks
    Abbreviated references to supporting published information (Source: Authors) Abbreviated citation of reference material used to support interpretion of basement domains. Full citations are provided in the accompanying report.
    notes
    Ages are presented for crustal growth where single dates represent specific events. Age ranges are presented where dating demonstrates a span of crustal growth events. Geologic ages are presented where the time of crustal growth is more generalized. (Source: Authors) Information presented on relations between domains, questions about unknown aspects of basement origin or development, and vergence of structures.
    Entity_and_Attribute_Overview:
    The tabular data can be joined to the polygon features using the field “Crust_Type”.
    Entity_and_Attribute_Detail_Citation:
    Datasets in this geospatial database include "Bsmnt_CONUS_AK", the polygon feature class of basement domains, and "tbl2_Environs_Deposits", tabular data for additional geologic and deposit information. Attributes for the polygon feature class “Bsmnt_CONUS_AK” are described under the “Attribute” section of this metadata. The tabular data "tbl2_Environs_Deposits” contains the following attribute fields: Crust_Type: Tectonic setting for the type of crust in each basement domain. Generally accepted tectonic settings are identified as the origin for each type of crust. Descriptions for tectonic settings and types of crust are presented in text. Geologic_Environments: Geologic environment represented in each identified tectonic setting. Generally accepted geologic environments that form in the tectonic settings that formed basement in each domain. Descriptions for geologic environments are presented in text. Primary_Metals_Deposits: Metal enrichments that may form in an identified geologic environment. Types of metals accumulations that form in specific geologic environments during original construction of crust and that may have resulted in enrichments of suites of metals or in ore deposits of specific types. Descriptions of the settings and genesis of original metal accumulations in each geologic environment are presented in text. References: Abbreviated citations; complete bibliographic citations are provided in the accompanying report.

Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
    • Lund, K.
    • Box, S.E.
    • Holm-Denoma, C.S.
    • San Juan, C.A.
    • Blakely, R.J.
    • Saltus, R.W.
    • Anderson, E.D.
    • DeWitt, E.H.
  2. Who also contributed to the data set?
    Spatial data supporting the Basement tectonic framework of the U.S. Project were developed by the U.S. Geological Survey Mineral Resources Program (MRP).
  3. To whom should users address questions about the data?
    Lund, Karen
    U.S. Geological Survey
    Research Geologist
    Box 25046
    Lakewood, CO
    USA

    (303) 236-5600 (voice)
    (303) 236-3200 (FAX)
    klund@usgs.gov

Why was the data set created?

This map of basement domains of the conterminous U.S. and Alaska is intended for use as a base layer for national-scale mineral resource assessments. The compositions, architecture, and original metals endowments are potentially important to assessments of primary mineral deposits and to the residence and recycling of metals in the crust of the U.S. parts of the North American continent. The database can be used to demonstrate the construction of the U.S. through time, to identify specific types of crust, and to identify domains potentially containing metal endowments of specific genetic types or endowed with specific metals.

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: 2013 (process 1 of 1)
    Polygons in this dataset represent interpretations of basement composition, origin, and architecture developed from a broad variety of sources. Analysis of previously published basement, lithotectonic, and terrane maps as well as models of planetary development were used to formulate the concept of basement and the methodology of defining domains that spanned the ages of Archean to Present but formed through different processes. The preliminary compilations for the study areas utilized these maps, national-scale gravity and aeromagnetic data, published and limited new age and isotopic data, limited new field investigations, and conventional geologic maps. Citations for sources of data used to construct the polygons are provided in attribute tables and the accompanying report.
  3. What similar or related data should the user be aware of?

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

  1. How well have the observations been checked?
    The accuracy of attribute values varies by field. Values within descriptive fields represent new terminology developed by the report authors (for example, Crust_Type), or are modified from published geologic maps and reports (for example, Crust_Formation_Age) and therefore dependent on the accuracy of the source.
  2. How accurate are the geographic locations?
    The positional accuracy of basement domain boundaries is dependent on the source, scale, and accuracy of the base materials. In general, positional accuracy is approximate, highly variable, and not accurate at scales larger than 1:5,000,000.
  3. How accurate are the heights or depths?
  4. Where are the gaps in the data? What is missing?
    Dataset coverage includes the continental U.S. and Alaska.
  5. How consistent are the relationships among the observations, including topology?
    Polygons in this dataset were checked for topological consistency (polygonal gaps and overlaps were corrected). Attribute fields containing dates were visually inspected for logical consistency (e.g. the age of crustal formation was greater than the age of crustal accretion).

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:
These data are intended for use at 1:5,000,000 scale. Data have been checked to ensure the accuracy. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. Acknowledgement of the U.S. Geological Survey would be appreciated in products derived from these data. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the data set in nonproprietary form, as well as in ArcGIS format, this metadata file may include some ArcGIS-specific terminology.
  1. Who distributes the data set? (Distributor 1 of 1)
    U.S. Geological Survey
    USGS Information Services
    Box 25286, DFC
    Denver, CO
    USA

    1-888-ASK-USGS (voice)
    ask@usgs.gov
  2. What's the catalog number I need to order this data set?
  3. What legal disclaimers am I supposed to read?
    Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this information product, for the most part, is in the public domain, it also contains copyrighted materials as noted in the text. Permission to reproduce copyrighted items must be secured from the copyright owner. This database, identified as DS 898, has been approved for release and publication by the U.S. Geological Survey (USGS). Although this database has been subjected to rigorous review and is substantially complete, the USGS reserves the right to revise the data pursuant to further analysis and review. Furthermore, it is released on condition that neither the USGS nor the U.S. Government may be held liable for any damages resulting from its authorized or unauthorized use. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system, or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. The USGS shall not be held liable for improper or incorrect use of the data described and/or contained herein.
  4. How can I download or order the data?

Who wrote the metadata?

Dates:
Last modified: 07-Dec-2016
Metadata author:
Carma San Juan
U.S. Geological Survey
Physical Scientist
Box 25046, DFC
Denver, CO
USA

303-236-2450 (voice)
(303) 236-3200 (FAX)
Metadata standard:
Content Standard for Digital Geospatial Metadata (FGDC-STD-001-1998)

This page is <https://mrdata.usgs.gov/metadata/ds-898.faq.html>
Generated by mp version 2.9.47 on Mon Mar 26 17:20:48 2018