Structural expressions of flexural extension in the arc-continent collisional foredeep of western Taiwan
Structural expressions of flexural extension in the arc-continent collisional foredeep of western Taiwan
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DOI：
10.1130/0-8137-2358-2.1
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Yin-Wei Chou;Hongzhou Yu
中科院分区：
文献类型：
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作者：
Yin-Wei Chou;Hongzhou Yu
台湾西部前渊发育于上新世-第四纪台湾造山带形成时期。前渊内的沉积序列被上新世-第四纪的一些正断层所抵消。这些年轻的正断层的存在和意义被忽视了，或者被错误地解释为裂谷特征。工业多道地震剖面和钻孔信息已被用于这项研究中，以检查这些正断层的背景下，弯曲延伸模型和文件的结构表达和时空变化。与同裂谷成因的早第三纪正断层不同，台湾海峡上新世-第四纪正断层的资料表明与邻近的褶皱冲断带有着密切的关系。这些观测结果和地震反射剖面的解释支持了台湾西部前渊下的地壳已经被岩石圈弯曲而弯曲下翘和变形的观点。
The western Taiwan foredeep developed in the Pliocene–Quaternary during the formation of the Taiwan orogen. The sedimentary sequences within the foredeep are offset by a number of normal faults dated as Pliocene–Quaternary. The presence and significance of these young normal faults have been neglected, or they have mistakenly been interpreted as rifting features. Industrial multichannel seismic profiles and borehole information have been used in this study to examine these normal faults in the context of the model of flexural extension and to document their structural expressions and spatial and temporal variations. Unlike the early Tertiary normal faults of synrift origin, data from Pliocene–Quaternary normal faults in the Taiwan Strait indicate a close relationship to the adjacent fold-and-thrust belt. The results of these observations and interpretations of seismic reflection profiles support the idea that the crust underlying the western Taiwan foredeep has been flexurally downwarped and deformed by lithospheric bending.