Circum-pacific tectonic maps as aids to energy and mineral exploration
Conference
·
· Am. Assoc. Pet. Geol., Bull.; (United States)
OSTI ID:5187564
Each Circum-Pacific Tectonic Map sheet gives a tectonic synopsis of one-eighth of the earth's surface and contains enough detail to illustrate specifics of individual regions. The maps show the active plate margins and the contrasting oceanic and continental crustal domains. Crustal domains are further subdivided into cover rocks and basement complexes. In the oceanic crustal domain, successive episodes of sea-floor spreading are color coded. These episodes seem to correlate between distant oceanic regions and may reflect worldwide changes in plate kinematics. Oceanic plateau, seamount, and island volcanic rocks are shown by patterns; their ages are color coded. Sedimentary cover is indicated by isopachs. At convergent plate margins, where allochthonous microcontinents represent older basement complexes, three main types of units are shown: magmatic arcs, forearc sediments, and accretionary prism rocks. The continental crustal domain is divided into basement rocks, transitional and reactivation sequences, and cover rocks. Basement includes metamorphic, intrusive, and deformed sedimentary and volcanic rocks. Color coding indicates age of metamorphism, emplacement, and deformation. Transitional sequences are defined as deposits directly succeeding major deformation in orogenic regions and preceding platform-strata deformation. Igneous rocks include most felsic volcanics, bimodal volcanics in rifts, and postkinematic granites and associated volcanics. Sedimentary rocks include molasselike deposits, commonly in foreland basins, foredeeps or intradeeps, and grabens. Reactivation sequences comprise deposits unrelated to preceding tectonism, except for inherited structural control. These sequences are related to plate collisions exemplified by basin related to collision of the Indian plate with the Asian plate.
- Research Organization:
- New South Wales Geological Survey, Sydney, Australia
- OSTI ID:
- 5187564
- Report Number(s):
- CONF-8608105-
- Conference Information:
- Journal Name: Am. Assoc. Pet. Geol., Bull.; (United States) Journal Volume: 70:7
- Country of Publication:
- United States
- Language:
- English
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