| 南海北部陆丰凹陷LF14井中新世古水深变化及沉降特征* |
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| 引用本文： | 薛力园,丁旋,裴人傑,万晓樵.南海北部陆丰凹陷LF14井中新世古水深变化及沉降特征*[J].热带海洋学报,2018,37(2):72-83. |
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| 作者姓名： | 薛力园 丁旋 裴人傑 万晓樵 |
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| 作者单位： | 1. 中国地质大学(北京)海洋学院, 北京 1000832. 中国地质大学(北京)地球科学与资源学院, 北京 100083 |
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| 基金项目： | 国家自然科学基金重点项目(91328201) |
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| 摘 要： | 南海北部陆丰凹陷内LF14井记录了早中新世至早上新世的海相沉积地层。古水深重建结果显示研究井位在早中新世突然发生海侵, 水深迅速上升至最大值275m, 随后经数次波动, 整体处于中—外陆架环境, 共记录了5个完整的海侵—海退层序。回剥分析方法重建的LF14井沉降史揭示了研究井位在中中新世(17.5—10Ma)处于快速沉降期, 快速沉降导致的凹陷内沉积物的可容纳空间发育速率高和陆源物质供给充足是造成该阶段沉积速率高的两个重要因素; 晚中新世—早上新世(10—4.53Ma)处于弱沉降期, 推测东沙运动导致凹陷内的沉积物可容纳空间发育速率变小和陆源物质供给减少, 造成该时期内研究井位沉积速率低。最后, 依据定量重建的古水深变化在研究层段识别出一系列短暂存在的构造上升事件。
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| 关 键 词： | 有孔虫 古水深 构造沉降 中新世 南海北部 |
| 收稿时间： | 2017-05-22 |
| 修稿时间： | 2017-09-06 |
Miocene evolution of paleo-water depth and subsidence revealed in Well LF14 from Lufeng Sag,northern South China Sea |
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| Liyuan XUE,Xuan DING,Renjie PEI,Xiaoqiao WAN.Miocene evolution of paleo-water depth and subsidence revealed in Well LF14 from Lufeng Sag,northern South China Sea[J].Journal of Tropical Oceanography,2018,37(2):72-83. |
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| Authors: | Liyuan XUE Xuan DING Renjie PEI Xiaoqiao WAN |
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| Institution: | 1. School of Ocean Sciences, China University of Geosciences, Beijing 100083, China2. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | Well LF14, drilled in the Lufeng Sag of the northern South China Sea, discloses marine sediment archives ranging from the mid-to-late period of the early Miocene to the early Pliocene. An abrupt rise in paleo-water depth up to 275 m during the early Miocene is recorded at the lowermost part of the well, followed by several fluctuations thereafter. The early Miocene to early Pliocene deposits are interpreted as formed under middle-to-outer shelf environment, and five complete transgressive-regressive sea-level cycles are identified. The results of backstripping calculations indicate a rapid subsidence in the study area during 17.5-10 Ma. The high sedimentation rate in this period may be caused by rapid tectonic subsidence and high terrigenous input. The subsidence rate was low from 10 to 4.53 Ma, characterized by a low sedimentation rate mainly due to less supply of terrigenous materials and less accommodation space caused by the Dongsha Movement. Finally, several short-lived uplift events were identified in the well based on quantitative reconstruction of paleo-water depth. |
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| Keywords: | foraminifera paleo-water depth tectonic subsidence Miocene northern South China Sea |
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