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Mineral Resources On-Line Spatial Data

Generalized thermal maturity map of Alaska

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Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 1997

Title: Generalized thermal maturity map of Alaska

Geospatial_Data_Presentation_Form: map

Publication_Information:

Publication_Place: Anchorage, AK
Publisher: U.S. Geological Survey

Online_Linkage: <http://agdc.usgs.gov/data/usgs/geology/>

Larger_Work_Citation:

Citation_Information:

Originator: Johnsson, M.J. (ed.)

Originator: Howell, D.G. (ed.)

Publication_Date: 1996

Title: Thermal evolution of sedimentary basins in Alaska

Series_Information:

Series_Name: U.S. Geological Survey Bulletin
Issue_Identification: B-2142

Description:

Abstract:: This dataset consists of a polygon coverage and associated attribute data derived from the onshore portion of the 1996 "Generalized Thermal Maturity Map of Alaska" compiled by M.J. Johnsson and D.G. Howell, which was published as Plate 1 in US Geological Survey Bulletin 2142: "Thermal Evolution of Sedimentary Basins in Alaska". The published map summarizes vitrinite reflectance and conodont alteration index data (both measure the thermal maturity of rocks) into generalized units that can be shown cartographically at 1:2,500,000. This digital dataset includes the 8 map units indicated on the original map. (5 thermal maturity levels; 2 rock or sediment type; 1 "no data"). The data quality of the generalized information is retained, with an attribute value for "certainty" whose value choices are "questioned" or "certain". Additional data retained in a look-up table are the maximum and minimum vitrinite reflectance and conodont alteration index values assigned to each thermal maturity level. This coverage is not intended to be a complete representation of the printed map. It does NOT include the following features: locations of individual vitrinite or conodont sample data points (these data are available in: Johnsson and others, 1992, USGS Open File Report 409, 3 diskettes); faults; offshore maturity data (from dredge and well samples); cities, glaciers, wells; inset maps and subsurface contours for the Colville basin and Cook Inlet; the correlation chart, text or references printed on the map.
Purpose:: This coverage is intended to provide digital features (polygons) representing generalized thermal maturity units in Alaska for use in small-scale spatial analysis (statewide) with similar coverages such as geologic units,vegetation types, soils, etc. Johnsson, M.J., Pawlewica, M.J., Harris, A.G., and Valin, Z.C., 1992, Vitrinite reflectance and conodont color alteration index data from Alaska: Data to accompany the Thermal Maturity Map of Alaska: U.S. Geological Survey Open File Report 92-409, 3 Macintosh-formatted 3 1/2" high density (1.44 Mb) diskettes.

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1997

Currentness_Reference: Publication date = 1996

Status:

Progress: Complete
Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -176.0
East_Bounding_Coordinate: -130.0
North_Bounding_Coordinate: 72.0
South_Bounding_Coordinate: 51.0

Keywords:

Theme:

Theme_Keyword_Thesaurus: None
Theme_Keyword: Geology
Theme_Keyword: Thermal
Theme_Keyword: Maturity
Theme_Keyword: Temperature
Theme_Keyword: Vitrinite
Theme_Keyword: Conodont

Place:

Place_Keyword_Thesaurus: None
Place_Keyword: Alaska

Stratum:

Stratum_Keyword_Thesaurus: None
Stratum_Keyword: None

Temporal:

Temporal_Keyword_Thesaurus: None
Temporal_Keyword: None

Access_Constraints: none

Use_Constraints:

This coverage should not be copied or distributed without its associated metadata file. Intended use is at small scales (e.g. statewide, 1:2,500,000 etc.) only; enlargements of this data to scales greater than that at which they were originally compiled can lead to misinterpretation of data. The U.S. Geological Survey (Dept. of Interior) should be acknowledged as the data source in products derived from these data. Use of these data is not restricted; however, organizations, agencies, units of government or other users are responsible for its appropriate application.

Point_of_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization:: U.S. Geological Survey Alaska Section, Mineral Resource Surveys Program, Geologic Division

Contact_Position: GIS Support Staff

Contact_Address:

Address_Type: mailing and physical address
Address: 4200 University Dr.
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4667

Contact_Voice_Telephone: (907)-786-7495

Browse_Graphic:

Browse_Graphic_File_Name: <http://agdc.usgs.gov/data/usgs/geology/images/maturity.gif>
Browse_Graphic_File_Description:: Reduced-size image of the entire map extent, 712x563 pixels, 18k bytes.
Browse_Graphic_File_Type: GIF

Data_Set_Credit: D. C. Pray, J. M. Schmidt

Native_Data_Set_Environment: SunOS, 5.5.1, sun4u UNIX, ARC/INFO version 7.1.2

Data_Quality_Information:

Attribute_Accuracy:

Attribute_Accuracy_Report:: The completeness and quality of the generalized maturity data in the digital coverage is that of the published 1996 map, which itself summarized data released in 1992 and collected prior to that date (mainly since 1980). No recent data have been added. The geographic accuracy of the published map has been slightly degraded by the rubber-sheet operation.

Completeness_Report:

The following map features are not included in the digital representation: Offshore data, faults, glaciers,subsurface contours, cities, wells, inset maps, correlation chart, text and references.

Lineage:

Source_Information:

Source_Citation:

Citation_Information:

Originator: U.S. Geological Survey

Publication_Date: 1996

Title: Generalized Thermal Maturity Map of Alaska

Series_Information:

Series_Name: U.S. Geological Survey Miscellaneous Investigations Series Map
Issue_Identification: I-2494

Publication_Information:

Publication_Place: Washington, D.C.
Publisher: U.S. Government Printing Office

Source_Scale_Denominator: 2500000

Type_of_Source_Media: Paper map

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1996

Source_Currentness_Reference: publication date

Source_Information:

Source_Citation:

Citation_Information:

Originator: Johnsson, M.J.

Originator: Pawlewica, M.J.

Originator: Harris, A.G.

Originator: Valin, Z.C.

Publication_Date: 1992

Title:

Vitrinite reflectance and conodont color alteration index data from Alaska: Data to accompany the Thermal Maturity Map of Alaska

Series_Information:

Series_Name: U.S. Geological Survey Open File Report
Issue_Identification: 92-409

Source_Scale_Denominator: 2500000

Type_of_Source_Media: floppy disk

Source_Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1992

Source_Currentness_Reference: publication date

Process_Step:

Process_Description:: The linework was digitized in 1997 from a paper copy of the 1996 map at the U.S. Geological Survey's Alaska Section (Geologic Division) facilities in Anchorge, AK. The original Transverse Mercator projection of the map (Central Meridian: 100*W; Scale factor: 0.926; Reference ellipsoid:(6371204m, 63712004m)) was converted to an Albersequal-area coverage in ARC/INFO (version 7.1.2). The resulting coverage did not align exactly with an Albers equal-area coverage of the Alaskan coastline, so a rubber-sheeting operation was performed using points along the coastline and major rivers to match an Albers equal area projection. Map unit (polygon) locations and attributes were checked by the person responsible for the digitizing, and spot-checked by one reviewer reviewer, by comparing a printed copy of the coverage to the published map.
Process_Date: 1997

Spatial_Data_Organization_Information:

Direct_Spatial_Reference_Method: Vector

Point_and_Vector_Object_Information:

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 1575

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: String
Point_and_Vector_Object_Count: 3453

SDTS_Terms_Description:

SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 1576

Spatial_Reference_Information:

Horizontal_Coordinate_System_Definition:

Planar:

Map_Projection:

Map_Projection_Name: Albers Conical Equal Area

Albers_Conical_Equal_Area:

Standard_Parallel: 55
Standard_Parallel: 65
Longitude_of_Central_Meridian: -154
Latitude_of_Projection_Origin: 50
False_Easting: 0.00000
False_Northing: 0.00000

Planar_Coordinate_Information:

Planar_Coordinate_Encoding_Method: coordinate pair

Coordinate_Representation:

Abscissa_Resolution: 1.0
Ordinate_Resolution: 1.0

Planar_Distance_Units: meters

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.4
Denominator_of_Flattening_Ratio: 294.98

Entity_and_Attribute_Information:

Detailed_Description:

Entity_Type:

Entity_Type_Label: MATURITY.PAT
Entity_Type_Definition: Attribute table of Maturity

Attribute:

Attribute_Label: MATURITY

Attribute_Definition: Thermal-maturity units

Attribute_Definition_Source: Generalized Thermal Maturity Map of Alaska, 1996.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: U
Enumerated_Domain_Value_Definition: Undermature

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: M1
Enumerated_Domain_Value_Definition: Mature I

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: M2
Enumerated_Domain_Value_Definition: Mature II

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: O
Enumerated_Domain_Value_Definition: Overmature

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: S
Enumerated_Domain_Value_Definition: Supermature

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Ig-M
Enumerated_Domain_Value_Definition: Igneous-Metamorphic

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Qs
Enumerated_Domain_Value_Definition: Quaternary sediments (unconsolidated)

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: ND
Enumerated_Domain_Value_Definition: No data

Attribute:

Attribute_Label: CERTAINTY

Attribute_Definition: Confidence of thermal-maturity unit

Attribute_Definition_Source: Generalized Thermal Maturity Map of Alaska, 1996.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: C
Enumerated_Domain_Value_Definition: Certain

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Q
Enumerated_Domain_Value_Definition: Questioned

Detailed_Description:

Entity_Type:

Entity_Type_Label: MATURITY.DAT
Entity_Type_Definition:: Explanation of thermal-maturity units in terms of vitrinite reflectance and conodont alteration index values used to define them.
Entity_Type_Definition_Source: U.S. Geological Survey Bulletin 2142

Attribute:

Attribute_Label: MATURITY

Attribute_Definition: Thermal-maturity units

Attribute_Definition_Source: Generalized Thermal Maturity Map of Alaska, 1996.

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: U
Enumerated_Domain_Value_Definition: Undermature

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: M1
Enumerated_Domain_Value_Definition: Mature I

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: M2
Enumerated_Domain_Value_Definition: Mature II

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: O
Enumerated_Domain_Value_Definition: Overmature

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: S
Enumerated_Domain_Value_Definition: Supermature

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Ig-M
Enumerated_Domain_Value_Definition: Igneous-Metamorphic

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: Qs
Enumerated_Domain_Value_Definition: Quaternary sediments (unconsolidated)

Attribute_Domain_Values:

Enumerated_Domain:

Enumerated_Domain_Value: ND
Enumerated_Domain_Value_Definition: No data

Attribute:

Attribute_Label: RO-MIN

Attribute_Definition:

Minimum vitrinite reflectance value occurring in a thermal maturity unit.

Attribute_Definition_Source: U.S. Geological Survey Bulletin 2142

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 5.01
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: RO-MAX

Attribute_Definition:

Maximum vitrinite reflectance value occurring in a thermal maturity unit.

Attribute_Definition_Source: U.S. Geological Survey Bulletin 2142

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.01
Range_Domain_Maximum: 8
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CAI-MIN

Attribute_Definition:

Minimum conodont alteration index value occurring in a thermal maturity unit.

Attribute_Definition_Source: U.S. Geological Survey Bulletin 2142

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0
Range_Domain_Maximum: 5
Attribute_Measurement_Resolution: 0.01

Attribute:

Attribute_Label: CAI-MAX

Attribute_Definition:

Maximum conodont alteration index value occurring in a thermal maturity unit.

Attribute_Definition_Source: U.S. Geological Survey Bulletin 2142

Attribute_Domain_Values:

Range_Domain:

Range_Domain_Minimum: 0.1
Range_Domain_Maximum: 8
Attribute_Measurement_Resolution: 0.01

Distribution_Information:

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Alaska Geographic Data Committee

Contact_Address:

Address_Type: mailing and physical
Address: 4230 University Drive
City: Anchorage
State_or_Province: AK
Postal_Code: 99508-4664

Contact_Electronic_Mail_Address: agdcweb@usgs.gov

Distribution_Liability:

Although these data have been processed successfully on a computer system at the U.S. Geological Survey, U.S. Department of the Interior, no warranty expressed or implied is made by the Geological Survey regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. The U.S. Dept. of Interior, nor any of its agencies are liable for misuse of the data, nor for any damage, transmission of viruses or computer contamination caused through transmission of these data sets.

Standard_Order_Process: