台湾海峡晚更新世以来的高分辨率地震地层学研究

周勐佳; 吴自银; 马胜中; 尚继宏; 梁裕杨; 周洁琼; 李守军; 赵荻能

doi:10.3969/j.issn.0253-4193.2016.09.008

台湾海峡晚更新世以来的高分辨率地震地层学研究

doi: 10.3969/j.issn.0253-4193.2016.09.008

1.
国家海洋局第二海洋研究所, 浙江杭州 310012;国家海洋局海底科学重点实验室, 浙江杭州 310012;国家海洋局东海海洋环境调查勘察中心, 上海 200137
2.
国家海洋局第二海洋研究所, 浙江杭州 310012;国家海洋局海底科学重点实验室, 浙江杭州 310012
3.
广州海洋地质调查局, 广东广州 510075
4.
浙江大学地球科学学院, 浙江杭州 310027

基金项目: 国家自然科学基金（41476049，41206046，41576099，41374043）；海洋地质调查（GZ201400207，GZ201400208）；科技基础性工作专项（2013FY112900）；海洋公益项目（201105001）；国家海洋局第二海洋研究所基本科研业务专项（JT1403）。

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出版历程
- 收稿日期: 2015-11-16
- 修回日期: 2016-04-05

High resolution seismic stratigraphy research in the Taiwan Strait since late Pleistocene

1.
The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China;East Sea Marine Environmental Investigating & Surveying Center, State Oceanic Administration, Shanghai 200137, China
2.
The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Key Laboratory of Submarine Geosciences, State Oceanic Administration, Hangzhou 310012, China
3.
Guangzhou Marine Geological Survey, Guangzhou 510075, China
4.
Department of Earth Sciences, Zhejiang University, Hangzhou 310027, China

摘要

摘要: 基于4 530 km高分辨率单道地震数据和钻孔资料，采用高分辨率地震地层学的方法，对台湾海峡晚更新世以来的地层进行了划分，自上而下共识别出R₀、R₁、R₂、R₃、R₄等5个主要反射界面，分别对应海底、3 ka BP前后高海平面、最大海泛面、海侵面和 Ⅰ 型层序界面，并以此划分出4个地层单元：晚全新世浅海-滨海沉积A，中全新世浅海沉积B，早全新世海侵沉积C，晚更新世陆相河流沉积D。在海平面变化的作用下，海峡地区先后发育低水位沉积D（低位体系域），海侵沉积C （海侵体系域）、高水位沉积B和A（高位体系域）。研究了台湾海峡的典型地震相，提出了关于台中浅滩（云彰隆起）处的楔状沉积体的新观点，认为该楔状体为全新世中期以来形成的三角洲沉积受波浪和潮流作用改造而形成的潮流沙脊，其物质主要来源于台湾。识别出了晚更新世和早全新世古河道沉积，海平面变化和地势高低是其形成时间差异的主要因素。
- 高分辨率地震地层学 /
- 地震相 /
- 海平面 /
- 晚更新世 /
- 台湾海峡
Abstract: Based on 4 530 km high resolution seismic data and core data, we divide the sequence stratigraphy in the Taiwan Strait since late Pleistocene, using the method of high resolution seismic stratigraphy. The main reflective interfaces R₀,R₁,R₂,R₃ and R₄ correspond to the seafloor, the high sea level at 3 ka BP, the maximum flooding surface, the transgressive surface and the type I sequence boundary, respectively. And the depositional sequence includes four stratigraphic units: the late Holocene neritic-littoral deposits A, the middle Holocene shallow sea deposits B, the early Holocene transgression sediments C, and the late Pleistocene continental fluvial deposits D. In response to the sea level changes, the strait formed low-stand deposits (LST), transgression deposits (TST), and high-stand deposits (HST) in turn. Furthermore, typical seismic facies are studied, and a new viewpoint about the wedge at the Taichung shoal (Yun-chang Rise) is proposed: the wedge is delta deposition, of which the sediments mainly come from Taiwan, formed since mid-Holocene, and transformed into a tidal sand ridge by combined waves and tidal currents. Besides, we identify the late Pleistocene and the early Holocene paleo-channel depositions, of which the forming time difference is mainly caused by sea level change and its topography.
- highresolution seismic stratigraphy /
- seismic facies /
- sea level /
- late Pleistocene /
- Taiwan Strait

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