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| T25: | From Subduction to Collision, with Recent TAIGER and Other Results |
| Sponsor: |
Tectonophysics
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| CoSponsor: |
Seismology |
| Convener: |
Francis Wu Dept of Geol. Sci., State University of New York Vestal Parkway East Binghamton, NY, USA 607-777-2512 wu@binghamton.edu Liu Char-Shine Inst. of Oceanography, National Taiwan University Taipei, TWN csliu@ntu.edu.tw Serge Lallemand Geosciences, Universite Montpellier 2 Géosciences Montpellier Place E. Bataille Montpellier, FRA lallem@gm.univ-montp2.fr Timothy Byrne Marine Sciences, University of Connecticut USA tim.byrne@uconn.edu |
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8108 8164 8170 8180 7230 .
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| Description: |
Tectonic processes of orogeny and the roles of subduction and collision in orogeny need further elucidation. In this special session we would like to solicit papers on the analysis of new results from active orogens relating to these problems. Works based on or integrating new, detailed land or marine geophysical observations, GPS, structural geology, thermo-chronology and surficial processes are particularly welcome as well as insights into orogeny arising from geodynamic modeling. Recent intense geophysical data acquisition in a number of orogenic belts around the world and, in particular, in and around the young and active Taiwan orogen have produced a wealth of relevant data. New images and studies of the transition from subduction to collision are emerging. Research based on geological observations have prompted new thinking. At this time continuous discussion among research groups working on young orogens can be mutually beneficial. This special session provides a venue for such discussions and we invite papers on similar studies focused on young collisions elsewhere in the world. In its fifth year, the TAIGER project, aiming at the arc-continent collision of Taiwan, has culminated in enhanced marine multichannel and sea-land seismic experiments that spans April to July, 2009. The marine survey covered a wide area including the northeastern South China Sea, the Luzon subduction system, the Gagua Ridge, the West Philippine Sea Basin, and the Ryukyu subduction and backarc extension system. Preliminary results from MCS profiles processed onboard the R/V Langseth and the preliminary land recordings of the airguns show many tectonically significant features. Also TAIGER land broadband and the broadband OBS data have enabled a wide range of seismic analyses to be carried out. For example, the joint passive and active land and ocean-bottom data have yielded a 3-D image of the Taiwan orogen and its surrounding areas down to 200 km based totally on TAIGER and two local permanent broadband network data; these images provide a concise view of the transition from subduction in southern Taiwan to collision in central Taiwan. These new results will help answer fundamental questions regarding the Taiwan orogeny. |