學術資源整合系統-相關推薦
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| 作者 | Wang, Yu;Lin, Yu-nung;Ota, Yoko;Chung, Ling-Ho;Shyu, J. Bruce H.;Chiang, Hong-Wei;Chen, Yue-Gau;Hsu, Ho-Han;Shen, Chuan-Chou |
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| 出版日期 | 202209 |
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| 已接受 | 20220912 |
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| 著作名稱 | Mud Diapir or fault-related fold? On the development of an active mud-cored anticline offshore southwestern Taiwan
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| 刊名 | Tectonics |
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| 卷 | 41 |
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| 頁數 | e2022TC007234 |
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| 被收錄索引 | SCI |
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| 主題 | 地質 |
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| 關鍵字 | mobile shale; mud diapir; marine terrace; kinematic fault-related fold model; escape tectonics |
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| 摘要 | There has been a controversial debate about the roles of diapiric folding versus fault-related folding in mud-cored anticlines. This study tackles this debate by looking into the structural developments in southwestern Taiwan. Among all the structures, the Liuchiu anticline is the only active structure exposed above sea level and therefore offers a unique opportunity to integrate land and marine datasets. On Liuchiu Island, we obtained the fold core geometry at the surface and identify three terrace groups with age constraints. In the offshore area, we obtained the fold limb geometry from seismic profiles. Given the tight fold shape and the asymmetric terrace tilting, we found that a hybrid fault tip fold-fault propagation fold model can best explain the geologic and geomorphic features. In this regard, mud diapirism should be a secondary process, possibly along discrete patches of mobile shales to enhance fold amplification. Our model yields decreasing shortening rates from 0.7 mm/yr during the Plio-Pleistocene to 0.375 mm/yr since 120 ka. The uplift rate however increases since the mid-Holocene, which we tentatively attribute to larger mobile shale deformation triggered by earthquakes along the fault after the near-fault fluids are drained. At the regional scale, we further suggest that the remaining plate convergence is absorbed by a few major structures west of Liuchiu Island. |
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| 資料連結 | ![Full Text]() |
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| DOI | DOI: 10.1029/2022TC007234 |
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| 系統號 | NO000006419 |
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