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Title: Geologic maps of Pacific basin and rim

Abstract

A major component of the Circum-Pacific Map Project is to compile five regional geologic maps at a scale of 1:10 million and a final map of the Pacific Ocean basin at a scale of 1:17 million. The Geologic Map of the Northeast Quadrant was published in 1983, and the Geologic Map of the Southeast Quadrant in 1985. The Geologic Maps of the Northwest Quadrant, the Southwest Quadrant, and the Antarctic Region are expected to reach publication during 1986. The Geologic Map of the Pacific Basin, with energy and mineral resources, is scheduled for publication in 1989. Each geologic map is a synthesis of a large amount of information. The land areas portray rock types by patterns and ages by colors; major faults are shown if they form the boundaries for map units. The oceanic areas include bathymetric contours, 13 sea-floor sediment types, all Deep Sea Drilling Program (DSDP) sites, selected DSDP columns, and selected sites of pre-Quaternary bedrock or sediment recovery. A correlation diagram on each map shows stratigraphic columns for the five regional maps, map units, geologic ages, and a time scale. An inset map shows presently active tectonic plates. The principal information sources for each sheet are givenmore » in a reference list, and each map is accompanied by explanatory notes. This map series represents the first integrated set of geologic maps of the entire Pacific Ocean basin and rim, including the Antarctic continent- altogether more than half the surface area of planet Earth.« less

Authors:
Publication Date:
Research Org.:
Univ. of Wisconsin, Madison
OSTI Identifier:
7247688
Report Number(s):
CONF-8608105-
Journal ID: CODEN: AAPGB
Resource Type:
Conference
Resource Relation:
Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States); Journal Volume: 70:7; Conference: 4. circum-Pacific energy and mineral resource conference, Singapore, China, 17 Aug 1986
Country of Publication:
United States
Language:
English
Subject:
02 PETROLEUM; 58 GEOSCIENCES; PACIFIC OCEAN; GEOLOGY; MAPS; GEOLOGIC FAULTS; RESEARCH PROGRAMS; SEDIMENTARY BASINS; TECTONICS; WELL DRILLING; DRILLING; GEOLOGIC FRACTURES; GEOLOGIC STRUCTURES; SEAS; SURFACE WATERS 020200* -- Petroleum-- Reserves, Geology, & Exploration; 580100 -- Geology & Hydrology-- (-1989)

Citation Formats

Craddock, C. Geologic maps of Pacific basin and rim. United States: N. p., 1986. Web.
Craddock, C. Geologic maps of Pacific basin and rim. United States.
Craddock, C. 1986. "Geologic maps of Pacific basin and rim". United States. doi:.
@article{osti_7247688,
title = {Geologic maps of Pacific basin and rim},
author = {Craddock, C.},
abstractNote = {A major component of the Circum-Pacific Map Project is to compile five regional geologic maps at a scale of 1:10 million and a final map of the Pacific Ocean basin at a scale of 1:17 million. The Geologic Map of the Northeast Quadrant was published in 1983, and the Geologic Map of the Southeast Quadrant in 1985. The Geologic Maps of the Northwest Quadrant, the Southwest Quadrant, and the Antarctic Region are expected to reach publication during 1986. The Geologic Map of the Pacific Basin, with energy and mineral resources, is scheduled for publication in 1989. Each geologic map is a synthesis of a large amount of information. The land areas portray rock types by patterns and ages by colors; major faults are shown if they form the boundaries for map units. The oceanic areas include bathymetric contours, 13 sea-floor sediment types, all Deep Sea Drilling Program (DSDP) sites, selected DSDP columns, and selected sites of pre-Quaternary bedrock or sediment recovery. A correlation diagram on each map shows stratigraphic columns for the five regional maps, map units, geologic ages, and a time scale. An inset map shows presently active tectonic plates. The principal information sources for each sheet are given in a reference list, and each map is accompanied by explanatory notes. This map series represents the first integrated set of geologic maps of the entire Pacific Ocean basin and rim, including the Antarctic continent- altogether more than half the surface area of planet Earth.},
doi = {},
journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 70:7,
place = {United States},
year = 1986,
month = 7
}

Conference:
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  • Seven new maps of the Circum-Pacific Region will be available in 1990 and an additional seven color proofs are to be exhibited at the Fifth Circum-Pacific Conference in Honolulu. The printed maps include the Antarctic Geologic Map, the Base, Geographic, and Geodynamic Maps of the recently added Arctic region, a Southwest Quadrant Tectonic Map, and a map with typical geologic cross sections depicting the Andean-Subandean basins of South America, all at a scale of 1:10,000,000. The seventh, the Natural Hazards Map of the Pacific Basin, at a scale of 1:17,000,000, includes information on geologic hazards such as earthquakes, landslides, volcanoes,more » and historical faulting as well as other natural hazards such as cyclonic storms (frequency and tracks), sea ice, icing of superstructures, wave heights, and tsunamis. Maps in proof stage include energy and resource maps of the Northwest, Southwest, and Southeast Quadrants of the Circum-Pacific region, and the new Geologic Map of the Arctic region, all at a scale of 1:10,000,000. The Circum-Pacific Map Project was initiated in 1973 by the Circum-Pacific Council for Energy and Mineral Resources. Overall supervision and production of the maps is by the US Geological Survey, and distribution is by the American Association of Petroleum Geologists. A sixth region, the Arctic, was added in 1988, and two new themes, natural hazards and typical cross sections of petroleum basins, were added recently to the existing eight basic map themes. The Circum-Pacific Map Project will have produced 40 maps by the time of the Conference, and 20 more maps are in various stages of compilation and production.« less
  • Digital cartography is the new technology for thematic mapping. This process can achieve the same results as conventional processes faster and easier, and it also allows us to extract data for derivative maps. The system used to prepare the Geologic and Tectonic Maps of the circum-Pacific Region consists of an electronic color separation scanner with variable resolution. It transforms freehand designs and other artwork into computer signals. The system also includes a color design console for map editing and an electronic laser plotter that produces full-size color separation films ready for printing.
  • The Lau basin is an actively spreading back-arc basin located west of the Tonga subduction zone and Tofua volcanic arc in the southwest Pacific Ocean. In the southern part of the basin is Valu Fa Ridge, a north-northeast-trending ridge located approximately 40 km west of the Tofua volcanic arc axis. There, spreading is occurring at a rate of 7 cm/year. Seven multichannel seismic reflection profiles over Valu Fa Ridge show a strong reflection 3.5 km beneath the sea floor. The inverted polarity of the reflection indicates that it is from a low-velocity zone, which is interpreted as the top ofmore » a flat, 2 to 3-km wide, axial magma chamber. The reflection coefficient indicates a large acoustic impedance contrast between the material above and below the reflector, possibly because a thin gas-rich layer is present at the top of the chamber. Two dredge hauls from the crest of Valu Fa Ridge recovered highly vesicular andesites that are relatively homogeneous, both mineralogically and chemically. Chemical data indicate a small but significant subduction-zone effect on the Valu Fa andesites. The presence of hydrothermal manganese crusts as much as 10 mm thick and nontronite in the dredge hauls, elevated concentrations of particulate and total dissolvable manganese in the water column above Valu Fa Ridge, and small bottom-water temperature anomalies indicate that hydrothermal circulation is occurring at the ridge.« less
  • The US Department of Energy Oak Ridge Reservation (ORR) is a 143 km[sup 2] area in the western part of the southern Appalachian foreland fold-thrust belt. As a result of activities at the site, nonhazardous, hazardous, radioactive, and mixed wastes have been stored, treated, and disposed of at various locations. Restoration plans for both known and potential areas of groundwater contamination require an understanding of groundwater flow pathways, flow rates, and discharge points. The area has thus been the focus of numerous geologic, geophysical, and hydrologic studies designed to characterize the groundwater flow system. Here the authors present results andmore » some applications of geologic mapping and an airborne geophysical survey of the ORR.« less
  • Surface-generating software is being used to construct geologic contour maps of aquifers in the San Juan basin. The maps are being prepared for the US Geological Survey's San Juan Basin Regional Aquifer-System Analysis. Geologic tops picked from geophysical logs are selected primarily from a data base of approximately 24,000 oil and gas test wells, supplemented with data from water wells and outcrops. A program was developed to eliminate suspected inaccurate data points intersecting the geographic information system coverage of control points with a polygon coverage of a fine-mesh grid. Points are collected by grid cell, and a mean value ismore » determined for tops and map-unit coordinates. Points whose tops deviate significantly from the mean are deleted if incorrect. Geologic tops and map-unit coordinates of remaining control points in the same grid cell are reaveraged to reduce (1) small discrepancies at specific points and (2) the number of points used. Formatted data are gridded by the surface-generating software, and a contour map is produced. If the map is satisfactory, the grid is smoothed to reduce abrupt meandering of contours. The map is redrawn using an option that produces a contour-output file containing map-unit coordinates and numerical-attribute values of contours. This file is used to create a geographic information system coverage. When a satisfactory contour map is produced and converted to a line coverage, the geographic information system edits, annotates, and clips contours with another line coverage consisting of the basinward part of the outcrop.« less