Structural control of the Gagua “Wedge” Zone east of Taiwan Island on the southern Okinawa Trough
Structural control of the Gagua “Wedge” Zone east of Taiwan Island on the southern Okinawa Trough
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DOI：
10.1360/03yd0246
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Yanpeng Zheng;Baohua Liu;Jinlong Wu;Ruicai Liang;Chenguang Liu;Zhengmin Zhang
中科院分区：
文献类型：
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作者：
Yanpeng Zheng;Baohua Liu;Jinlong Wu;Ruicai Liang;Chenguang Liu;Zhengmin Zhang
通过对实测资料和历史资料的综合分析和解释，研究了台湾岛以东海域加瓜“楔”带的地球物理场特征和构造特征，以及冲绳海槽南部弧后扩张的主构造应力方向及其变化。研究结果表明，加瓜“楔形”带与加瓜海隆及其两侧的两个断陷盆地构造一致，调整了西菲律宾海板块的运动方向和距离，使其东侧板块的北西运动转变为西侧板块的北俯冲，冲绳海槽由NW-SE向近N-S方向转变，为冲绳海槽进入第二次扩张阶段提供了应力源。
Based on compositive analysis and interpretation of the observed and historical data, the geophysical field characters and structural properties of the Gagua “Wedge” Zone of the sea area east of Taiwan Island and the primary tectonic stress direction and its variabilities of backarc spreading in the southern Okinawa Trough are studied. It is concluded from the study results that the Gagua “Wedge” Zone is structurally consistent with the Gagua ridge and two fault basins on both sides of the Gagua ridge, and adjusts the moving direction and distance of the western Philippine Sea plate to make the northwestward motion of the plate on its east side change to the northward subduction of the plate on its west side so that the primary tectonic stress direction of the Okinawa Trough changed from NW-SE to nearly N-S, which provided the stress source for the Okinawa Trough to enter the second spreading stage.