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Abstract: Cenozoic Plate Reconstruction and Implied Stress Pattern in Southeast Asia

Tung-Yi Lee

Analysis of available data were used to produce a detailed Cenozoic plate reconstruction of the southeast Asia region. A 3-D computer graphics system was used to manipulate the data, and to test published models of the Cenozoic tectonic evolution of southeast Asia to determine their consistency with the known geology and the recorded geophysical data. The results from plate reconstruction were further used to estimate the relative motion along plate boundaries. This information can be applied to derive the stress conditions around plate boundaries.

For instance, because of the left-lateral motion of the Red River fault, northern Indochina was under east-west compression and north-south extension in late Paleogene. At the same time, eastern Indochina was under sinistral shear, and southern Indochina was under, possibly, northeast-southwest extension. From early Oligocene to early Miocene, northern Indochina was still under the same stress condition as in late Paleogene. Southern and eastern Indochina changed to dextral shear. From middle Miocene to Holocene, northern Indochina has been under dextral shear. Eastern Indochina is under east-west extension, and southern Indochina is under northeast-southwest extension.

AAPG Search and Discovery Article #90982©1994 AAPG International Conference and Exhibition, Kuala Lumpur, Malaysia, August 21-24, 1994