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首页> 外文期刊>Journal of Asian earth sciences >Shifting submarine canyons and development of a foreland basin in SW Taiwan: controls of foreland sedimentation and longitudinal sediment transport
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Shifting submarine canyons and development of a foreland basin in SW Taiwan: controls of foreland sedimentation and longitudinal sediment transport

机译：台湾西南部海底峡谷的移动和前陆盆地的发展：前陆沉积和纵向泥沙输送的控制

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The modern Penghu Submarine Canyon is a sea floor expression of the convergent boundary between the frontal Taiwan orogenic wedge and the Chinese cratonic margin. The canyon is about 180 km long and trends N-S, parallel to the strike of the Taiwan mountain belt. It is ～240 m deep at the head increasing to ～3200 m deep at its mouth before merging gradually into the Manila Trench. The Penghu Canyon is considered a tectonically controlled canyon rather than a slope canyon dominated by down-slope processes. Tectonic controls prevail over sedimentary processes. Tectonics controls the orientation and location of the Penghu Canyon while sedimentary processes contribute to its excavation and enlargement. The axis of the deep-water, underfilled basin off SW Taiwan dips southward and parallels the strike of the Taiwan orogen with a characteristic longitudinal sediment transport route. Hence, the Penghu Canyon developed under the gravitational mass movement with its main course along the N-S basin axis, not in a SW or SE downslope direction of both margins. The initial Penghu Canyon began at the intersection of the upper slopes of the South China Sea and Kaoping Slopes. Sediment flows cut into the slope sediments following regional dip toward the south, and excavated along the deepest part of the sea floor, forming the present Penghu Canyon. Shifting of axes of Late Pliocene-Pleistocene canyons from onshore SW Taiwan to the present-day position of the Penghu Canyon reflects the evolving foreland basins with a longitudinal canyon transport system progressively migrating southwestward. The linkage of canyon migration and evolution of the foreland basin may have significant implications for the overall sedimentation and tectonics of the SW Taiwan region.
机译：现代的澎湖海底峡谷是台湾造山带前缘与中国克拉通边缘交汇处边界的海底表现。峡谷长约180公里，呈N-S趋势，与台湾山地带的走向平行。头部深度约240 m，其口部深度约3200 m，然后逐渐与马尼拉海沟合并。澎湖峡谷被认为是构造控制的峡谷，而不是由下坡过程主导的斜坡峡谷。构造控制胜过沉积过程。构造控制着澎湖峡谷的方向和位置，而沉积过程则有助于澎湖峡谷的发掘和扩大。台湾西南部的深水，未充满盆地的轴线向南倾斜，并与台湾造山带的走向平行，具有独特的纵向沉积物输送路径。因此，澎湖峡谷是在重力运动的推动下发展的，其主要走向是沿着南北向盆地轴线，而不是在两个边缘的西南向或东南向下坡方向。最初的澎湖峡谷始于南中国海上坡与高平坡的交汇处。随着区域向南倾斜，泥沙流切入斜坡沉积物中，并沿着海床最深的部分开挖，形成了目前的澎湖峡谷。上新世至更新世峡谷的轴线从台湾西南陆上移动到澎湖峡谷的现今位置，反映了不断发展的前陆盆地，纵向峡谷运输系统逐渐向西南迁移。峡谷迁移与前陆盆地演化的联系可能对台湾西南地区的整体沉积和构造产生重大影响。

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