Motion and evolution of the Chaochou Fault, Southern Taiwan

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Title: Motion and evolution of the Chaochou Fault, Southern Taiwan
Author: Hassler, Lauren E.
Abstract: The Chaochou Fault (CCF ) is both an important lithologic boundary and a significant topographic feature in the Taiwan orogenic belt . It is the geologic boundary between the Slate Belt to the east , and the Western Foothills to the west . Although the fault is known to be a high angle oblique sinistral thrust fault in places , both its kinematic history and its current role in the development of the orogen are poorly understood . Field fabric data suggest that structural orientations vary along strike , particularly in the middle segment , the suspected location of the intersection of the on -land Eurasian continent -ocean boundary and the Luzon Island Arc . Foliation /solution cleavage is oriented NE -SW and in the northern and southern sections , but ESE -WNW in the middle segment . Slip lineations also reveal a change in fault motion from dip -parallel in the north to a more scattered pattern in the south . This correlates somewhat with recent GPS results , which indicate that the direction of current horizontal surface motion changes along strike from nearly perpendicular to the fault in the northern field area , to oblique and nearly parallel to the fault in the southern field area . The magnitude of vertical surface motion vectors , relative to Lanyu Island , decreases to the south . Surface morphology parameters , including mountain front sinuosity and valley floor width /valley height ratio indicate higher activity and uplift in the north . These observations correlate well with published apatite /zircon fission track data that indicate un -reset ages in the south , and reset ages in the northern segment . Geodetic and geomorphic data indicate that the northern segment of the CCF and Slate Belt are currently undergoing rapid uplift related to oblique arc -continent collision between the Eurasian continent and the Luzon arc . The southern segment is significantly less active perhaps because the orogen is not yet involved in direct arc -continent collision .
URI: http : / /hdl .handle .net /1969 .1 /2697
Date: 2005-11-01


Motion and evolution of the Chaochou Fault, Southern Taiwan. Available electronically from http : / /hdl .handle .net /1969 .1 /2697 .

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