Generalized Thermal Maturity Map of AlaskaEntry ID: USGS_mapi-2494
Abstract: The files in this directory are those that were used to create the Generalized
Thermal Maturity Map of Alaska (USGS Miscellaneous Investigations Map I-2494),
published in 1996. These files are necessary for importing the map in digital
form into a Geographical Information System. Output files in several formats
also are included in this directory; these can be used any time a digital
version of ... the complete map is needed.
The map is based, in large part, on the vitrinite-reflectance (VR) and
conodont color-alteration-index (CAI) data in USGS Open-File Report 92-409, an
updated version of which also is included on this CD-ROM.
Alaska is a complex amalgamation of tectonic blocks with diverse histories.
Sedimentary basins that are formed on these blocks both before amalgamation and
as a result of collisions between them record the tectonic history of this
complex region. Thermal-maturity data-indicators of maximum burial
temperatures-provide important constraints both on basin evolution and on
terrane amalgamation. To help elucidate these relations, and to provide
constraints for hydrocarbon assessments, the U.S. Geological survey (USGS) has
compiled thermal-maturity data from Alaska for many decades. This report is a
digital release of our current understanding of thermal-maturity patters in
The 10 ARC/INFO coverages used to construct the map, together with the
directory "INFO" (needed by ARC/INFO to support the coverages), are found in
the "coverages" subdirectory. These coverages can be used by any GIS capable of
importing files in ARC/INFO format.
Export version of these coverages are found in the subdirectory "export files."
These files can be imported into ARC/INFO with the "import" command.
Shapefile versions of 9 of the ARC/INFO coverages are found in the subdirectory
"shapefiles." Each shapefile actually consists of three files, with extensions
.shp, .shx., and .dbf; all are needed for importation into a GIS supporting the
Inset figures and text, as well as the map title, headers, and
latitude-longitude ticks, were created as a separate file. This file is
available in Adobe Illustrator 6.0 format (insets.ill) and in Encapsulated
PostScript format (insets.eps) in the subdirectory "insetfigures."
The subdirectory "miscfiles" contains many important files needed to use these
coverages in ARC/INFO or another GIS.
Data Set Citation
Dataset Originator/Creator: Mark J. Johnsson; Kevin R. Evans, Heather A. Marshall
Dataset Title: Thermal Maturity of Sedimentary Rocks in Alaska
Dataset Series Name: U.S. Geological Survey Miscellaneous Investigations Series Map I-2494
Dataset Release Date: 1999
Dataset Release Place: Menlo Park, CA
Dataset Publisher: U.S. Geological Survey
Data Presentation Form: mapOnline Resource: http://pubs.usgs.gov/dds/dds-54/
Start Date: 1996-01-01Stop Date: 1996-12-31
Latitude Resolution: 0.025956 meters
Longitude Resolution: 0.025956 meters
LAND SURFACE > GEOMORPHOLOGY > TECTONIC LANDFORMS/PROCESSES
LAND SURFACE > SURFACE RADIATIVE PROPERTIES > REFLECTANCE
LAND SURFACE > SURFACE RADIATIVE PROPERTIES > THERMAL PROPERTIES
SOLID EARTH > GEOTHERMAL DYNAMICS > GEOTHERMAL TEMPERATURE
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > AGE DETERMINATIONS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > BEDROCK LITHOLOGY
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > IGNEOUS ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > METAMORPHIC ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > MINERALS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTARY ROCKS
SOLID EARTH > ROCKS/MINERALS/CRYSTALS > SEDIMENTS
SOLID EARTH > TECTONICS > PLATE TECTONICS > FAULT MOVEMENT
SOLID EARTH > TECTONICS > PLATE TECTONICS > FOLDS
SOLID EARTH > TECTONICS > PLATE TECTONICS > STRATIGRAPHIC SEQUENCE
Data Set Progress
Distribution Media: online, CD-ROM
Distribution Size: All files <1 megabyte each
Distribution Format: ARC/INFO export format, Coverages, and Shapefiles
Email: johnsson at brynmawr.edu
Bryn Mawr College
City: Bryn Mawr
Province or State: PA
Postal Code: 19010
Role: DIF AUTHOR
Email: pschweitzer at usgs.gov
U.S. Geological Survey 12201 Sunrise Valley Drive, Mail Stop 918
Province or State: VA
Postal Code: 20192
Johnson, Mark J. , Evans, Kevin R. , and Marshall, Heather A. , 1999, Thermal Maturity of Sedimentary Rocks in Alaska: Digital Resources: U.S. Geological Survey Digital Data Series DDS-54, U.S. Geological Survey, Menlo Park, CA.
Johnsson, Mark J. , and Howell, David G. , 1996, Thermal Evolution of
Sedimentary Basins in Alaska: U.S. Geological Survey Bulletin 2142, U.S.
Geological Survey, Denver, CO.
Creation and Review Dates
DIF Creation Date: 2000-07-27
Last DIF Revision Date: 2006-06-13