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|Title: ||A deep-crust study of the southern Ryukyu subduction system|
|Authors: ||Lee C.;Wang L.|
|Contributors: ||NTOU:Institute of Applied Geosciences|
|Issue Date: ||2012-06-15T07:43:41Z
|Publisher: ||American Geophysical Union Fall Meeting|
|Abstract: ||abstract:In 2009, the TAIGER experiment produced several OBS profiles around Taiwan to aim at a better understanding the tectonics of young orogenic belts. Our study area is in the offshore of east Taiwan. Several major features are presented here, which includes the Ryukyu subduction zone ( Ryukyu Arc, Hoping Basin, Nanao Basin, East Nanao Basin, Yaeyama Ridge and Ryukyu Trench), Huatung Basin, Gagua Ridge and West Philippine Basin. There are 3 reversed OBS profiles (T4A, T5E and T6E) for this research, as well as 3 major MCS lines (consist of MGL0906_16, MGL0906_20 and MGL0906_23). In this study, we have used 30 Taiwanese OBSs and 12 American OBSs to build the P-wave velocity models. As a result, the P-wave velocity models of these E-W profiles suggest the collision and subduction between the Eurosian and Philippine Sea plates and the sequences of these tectonic processes. They show that the crust thickness under the profiles is about 12-18 km, and all belong to the oceanic crust. These 3 lines represent the different stages of collision and subduction, before, present and after. In addition, we also propose that an initial subduction at the eastern side of Gagua Ridge. With the different linear direction of the marine magnetic anomaly, it indicates that the West Philippine Basin is in a counter-clockwise rotation and subduction. The counter-clockwise rotation seems to be one of the major tectonic forces in the evolutional history of West Philippine Basin. The formation of the east Taiwan as well as the mountain building processes of Taiwan can be better explained in this tectonic regime.|
|Appears in Collections:||[應用地球科學研究所] 演講及研討會|
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