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Structure and sedimentary history of Exmouth Plateau

Conference · · AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States)
OSTI ID:6120121
; ;
The large, deep-water Exmouth Plateau off northwestern Australia has been actively explored for petroleum, and a giant gas accumulation has been found. Data from industry and research institutions have established its geological framework. The plateau has a basement of continental crust that was thinned and extended in the Permian. This is overlain by 10 km of Phanerozoic strata, with an average of more than 3 km of Triassic, about 1 km of Jurassic/Cretaceous, and 0.5 km of Cenozoic strata. The plateau separated from other parts of the northern margin of Gondwanaland in the Mesozoic. Latest Triassic and Jurassic rifting formed large north-northeast-trending fault blocks; in the Oxfordian a microcontinent drifted away to the northwest, forming the plateau's northern margin. The other margins developed in the Neocomian as Greater India separated from Australia - the western margin by rifting and the southern by shearing. Terrigenous input declined greatly at that time. This old continental margin, with its relatively thin Mesozoic and Cenozoic sediments, was selected by the Ocean Drilling Program (ODP) for comprehensive and fully integrated sedimentologic, biostratigraphic, paleobathymetric, and subsidence studies.
Research Organization:
Bureau of Mineral Resources, Canberra (Australia)
OSTI ID:
6120121
Report Number(s):
CONF-890404-
Conference Information:
Journal Name: AAPG (Am. Assoc. Pet. Geol.) Bull.; (United States) Journal Volume: 73:3
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
AUSTRALASIA
AUSTRALIA
CRETACEOUS PERIOD
EXPLORATION
GEOLOGIC AGES
GEOLOGIC DEPOSITS
JURASSIC PERIOD
MESOZOIC ERA
MINERAL RESOURCES
NATURAL GAS DEPOSITS
PALEOZOIC ERA
PERMIAN PERIOD
PETROLEUM DEPOSITS
RESOURCES
TRIASSIC PERIOD