Fault-controlled genesis of the Chilung Sea Valley (northern Taiwan) revealed by topographic lineaments
Resource
Marine Geology 169 (3-4): 305-325
Journal
Marine Geology
Journal Volume
169
Journal Issue
3-4
Pages
305-325
Date Issued
2000
Author(s)
Abstract
The Chilung Sea Valley lies parallel to the coastline off northern Taiwan. It connects the coastal area to the Chilung Shelf through a descending rugged surface. This valley is about 65 km in length, 7-15 km in width, and ends, once across the shelf break, off the Santiaochiao coast in northeastern Taiwan. The descending gradient of the Chilung Valley floor is approximately 1/500, being very close to that of the Chilung Shelf. This implies that the valley might have originated from a solely tectonic event that acted on the shelf surface. On the basis of a well-controlled bathymetric data set collected in the study area, some topographic lineaments were extracted. Tracing these topographic lineaments that connect to a series of the NE-SW orientated faults extending from on-land Taiwan into the ocean, we identified three right-lateral strike-slip faults truncating these lineaments. The occurrence of these right-lateral strike-slip faults is suggested to result from compressive shearing under the orogeny of the convergence between the Philippine Sea plate and the Eurasian plate. The shearing upon the fault plane has been inhomogeneous along the path of the Chilung Valley, and has affected the shape of the valley. (C) 2000 Elsevier Science B.V.
SDGs
Type
journal article
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