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The AAPG/Datapages Combined Publications Database

Southeast Asia Petroleum Exploration Society (SEAPEX)

Abstract


Proceedings of the South East Asia Petroleum Exploration Society Volume VI, 1983
Pages 58-65

Obduction in Sabah

John McManus, R. B. Tate

Abstract

After a summary of the early Tertiary sedimentary deposits of Sabah attention is drawn to the existence of similar facies distributions in the Sulu Sea today. Proven change of ocean floor spreading from northwards to northeastwards about 32 million years ago is invoked to permit obduction of a slice of sea floor onto the Borneo micro-continent. The nature of the obducted material, the production of collapse induced slump breccias and the development and filling of crustal depressions with destruction products from the transported mass are examined. It is concluded that whereas the older onshore sedimentary sequences are unlikely to be rich in hydrocarbons, the Miocene and later basins, which escaped the disruption should provide much better prospects.


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