The topographical characteristics in the area off eastern Taiwan Island and their tectonic implication

LIU Bao-hua; ZHENG Yan-peng; WU Jin-long; HAN Guo-zhong

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LIU Bao-hua, ZHENG Yan-peng, WU Jin-long, HAN Guo-zhong. The topographical characteristics in the area off eastern Taiwan Island and their tectonic implication[J]. Haiyang Xuebao, 2005, 27(5): 82-91.

Citation:

LIU Bao-hua, ZHENG Yan-peng, WU Jin-long, HAN Guo-zhong. The topographical characteristics in the area off eastern Taiwan Island and their tectonic implication[J]. Haiyang Xuebao, 2005, 27(5): 82-91.

LIU Bao-hua, ZHENG Yan-peng, WU Jin-long, HAN Guo-zhong. The topographical characteristics in the area off eastern Taiwan Island and their tectonic implication[J]. Haiyang Xuebao, 2005, 27(5): 82-91.

Citation:

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The topographical characteristics in the area off eastern Taiwan Island and their tectonic implication

First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;Key Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, Qingdao 266061, China

Received Date: 2004-07-15
Rev Recd Date: 2004-12-27

Abstract

Abstract

On the basis of bathymetric data and other geological and geophysical data obtained during first survey in the area off eastern Taiwan Island from May to June in 2000,the topogr aphical features of the region,the tectonic control to the seafloor topography and their tectonic implication were studied and discussed.The results have revealed that both the slope zone of the Ryūkyū arc and the Ryūkyū Trench presenta typical morphot ectonic characteristics controlled by the trench-arc system in the West Pacific Ocean.At the slope of eastern Taiwan Island the isobathic lines parallel the coast line and distribute densely in nearly N-S direction and the slope gradient of topog raphy is large.Such a unique feature is at tributed to the collision of the Luzon arc and Eurasia continent.In the Huadong(Huatung) Basin,turbidity fans and submarine canyons are well developed,its form ations are mainly related to the steep topo graphy of the slope of the Luzon arc and the abundant supply of sediments.These submarine canyons are controlled by basement highs and strike-slip faults.On the eastern side and western side of the Gagua Ridge,both the water depth and morpho logical features are different,but the basement of Gagua Ridge belongs to the Huadong Basin.The eastern side of the Gagua Ridge(123°12'E) corresponds to the boundary of two plates with different ages.In the West Philippine Basin,linear ridges and troughs in a N W trending are identified,which are dissected by a N-E trending transform fault.According to the seafloor topography features,the direction of the transform fault and the magnetic anomaly lineations,the seaflo or of this region was formed during 60~45 Ma B.P.when the West Philippine Basin was spreading along NE-SW relative to present orientation.
- Taiwan Island,
- topographical characteristics,
- tectonic implication

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References(21)

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