Morphological characteristics in the area off eastern Taiwan Island and their tectonic implications

作     者：LIUBaohua ZHENGYanpeng WUJinlong HANGuozhong ZHANGDeyu LIU Baohua, ZHENG Yanpeng, WU Jinlong, HAN Guozhong, ZHANG DeyuFirst Institute of Oceanography, State Oceanic Administration, Qingdao 266061, ChinaKey Laboratory of Marine Sedimentology and Environmental Geology of State Oceanic Administration, Qingdao 2660061, China

作者机构：FirstInstituteofOceanographyStateOceanicAdministrationQingdao266061China KeyLaboratoryofMarineSedimentologyandEnvironmentalGeologyofStateOceanicAdministrationQingdao2660061China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2004年第23卷第3期

页      面：449-461页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

主　　题：Taiwan Island morphological characteristics tectonic implications 

摘      要：On the basis of bathymetric data and other geological and geophysical data obtained during the first survey conducted by Chinese Mainland in the area off eastern Taiwan Island from May to June in 2000, the morphological features of the region, the tectonic control to the seafloor topography and their tectonic implication are studied and discussed. The results have revealed that both the slope zone of the Ryukyu arc and the Ryukyu Trench present a typical morphotectonic characteristics controlled by the trench-arc system in the West Pacific Ocean. At the slope of eastern Taiwan Island the isobathic lines parallel to the coastline and distribute densely in nearly N-S direction and the slope gradient of topography is large. Such a unique feature is attributed to the collision of the Luzon arc and Eurasia continent. In the Huatung Basin, turbidity fans and submarine canyons are well developed, the formations of which are mainly related to the steep topography 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 eastern side and western side of the Gagua Ridge, both the water depth and morphological features are different, but the basement of Gagua Ridge belongs to the Huatung 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 NW trending are identified, which are dissected by a NE trending transform fault. According to the seafloor topography features, the direction of the transform fault and the magnetic anomaly lineations, the seafloor of this region was formed during 60-45 Ma B. P. when the West Philippine Basin was spreading along NE-SW relative to the present orientation.