--> Abstract: Neogene-Quaternary Eustasy and Collision Tectonism in Western Taiwan, by L. S. Teng; #91004 (1991)

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Neogene-Quaternary Eustasy and Collision Tectonism in Western Taiwan

TENG, LOUIS S., National Taiwan University, Taiwan, Republic of China

Taiwan is an active orogen formed by the collision between the Luzon arc and the Asian continent. Thick late Cenozoic coastal to shallow marine deposits exposed in the western foothills of western Taiwan preserved the sedimentary record of both tectonic and eustatic influences. Relating to the arc-continent collision, the Oligocene-Miocene deposits can be regarded as the pre-collisional continental margin sequence and the Pliocene-Quaternary deposits as the post-collisional foreland basin sequence. Geohistory analysis shows that the rates of sediment accumulation and basin subsidence remained low during the Miocene but increased dramatically during the Pliocene-Quaternary, reflecting the effects of exacerbated loading and unroofing of the growing orogen. In spite of the intense tecton c influence, facies variations in both the continental margin sequence and the foreland basin sequence are chronostratigraphically consistent with global eustatic fluctuations. It appears that eustatic fluctuations were able to leave a distinct signature in stratigraphic records regardless of the effects of collision tectonics.

 

AAPG Search and Discovery Article #91004 © 1991 AAPG Annual Convention Dallas, Texas, April 7-10, 1991 (2009)