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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 II, 1975
Pages 1-36

Tertiary Basins of Southeast Asia*

Richard W. Murphy

Abstract

Tertiary to Recent basins of four main types underlie 75% of Southeast Asia’s 10 million. sq. km.

Shelfal basins have continental crust on all flanks. They develop basement-controlled tectonic patterns except where sedimentary diapirism overprints flowage structures at shallow levels in deep-basin areas.

Continental margin basins have continental crust on one flank and oceanic on the other. They fill from the continental side and prograde toward the ocean. Asymmetric in profile, their infill consists of continent-derived clastics, andesitic pyroclastics, and reefal or platform carbonate buildups. Deformation results from an interplay between compressional and transcurrent forces.

Archipelagic basins are intraoceanic arc-basin complexes which form between subparallel arc-trench systems. Andesitic volcanoclastics together with reefal limestone characterize the margins of these basins, whereas basin centers contain thick pyroclastic turbidite sequences with intercalated submarine mudflow deposits. Structural style is exceedingly complex.

Marginal seas are small ocean basins which form by interarc spreading or by trapping of oceanic crust between continental margins and newly-risen island arcs.


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