Difference in full-filled time and its controlling factors in the central canyon of the Qiongdongnan Basin
Difference in full-filled time and its controlling factors in the central canyon of the Qiongdongnan Basin
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琼东南盆地中央峡谷充盈时间差异及其控制因素
DOI：
10.1007/s13131-015-0717-5
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发表时间：
2015-08
影响因子：
1.4
通讯作者：
Cui Mingzhe
中科院分区：
文献类型：
--
作者：
Shang Zhilei;Xie Xinong;Li Xushen;Zhang Daojun;He Yunlong;Yang Xing;Cui Mingzhe
基于高分辨率2D/3D地震资料解释，对南海西北琼东南盆地中央峡谷不同段段沉积充填特征及充填时间进行了研究。研究结果表明，中央峡谷的初始形成年龄可追溯到11.6 Ma（T40），此时峡谷因自西向东浊流的冲刷而开始发育。 11.6~8.2Ma（T40~T31）期间，重力流发生强烈下切，形成峡谷。峡谷充填物自8.2 Ma（T31）开始形成，以浊积岩沉积为主，在8.2~5.5 Ma期间由浊流通道的横向迁移和垂直叠加构成。浊流沉积物和物质输送沉积物（MTDs）互层发育于5.5~3.8 Ma（T30~T28）时期。此后，峡谷充填物主要由大规模的 MTD 组成，中间被小规模的浊流通道和薄层中上层泥岩所中断。中央峡谷按主要控制因素可分为地貌控制型、断层控制型和侵入改造型峡谷三种类型。其中，地貌控制峡谷发育于乐东、陵水、松南和宝岛凹陷西部，位于中央凹陷带北坡与南部隆起带之间的承压盆地中心。断控峡谷主要沿长昌凹陷和宝岛凹陷东部深部断裂发育。侵入改造峡谷仅发生在松南低隆起，仍主要受地貌控制，侵入改造只是改变了海底形态。中央峡谷满水时间自西向东差异较大，呈现先后向东晚的趋势。地貌控制型峡谷在3.8 Ma（T28）之前就被完全充填，而入侵改造型峡谷则因南缘峡谷壁隆起而推迟到2.4 Ma（T27）。至长昌坳陷，完全充填时间先后向东推迟，长昌坳陷东部峡谷至今仍未完全充填。中央峡谷充盈时间的差异主要受多种沉积物供给和区域构造活动的影响。由于来自西部和北部的浊流和MTD供应充足，中央峡谷西段较早被完全填满。由于输沙速度较慢，加上深部断裂的差异性沉降，峡谷充满的时间逐渐向东推迟。
Based on the interpretation of high resolution 2D/3D seismic data, sedimentary filling characteristics and fullfilled time of the Central Canyon in different segments in the Qiongdongnan Basin of northwestern South China Sea have been studied. The research results indicate that the initial formation age of the Central Canyon is traced back to 11.6 Ma (T40), at which the canyon began to develop due to the scouring of turbidity currents from west to east. During the period of 11.6–8.2 Ma (T40–T31), strong downcutting by gravity flow occurred, which led to the formation of the canyon. The canyon fillings began to form since 8.2 Ma (T31) and were dominated by turbidite deposits, which constituted of lateral migration and vertical superposition of turbidity channels during the time of 8.2–5.5 Ma. The interbeds of turbidity currents deposits and mass transport deposits (MTDs) were developed in the period of 5.5–3.8 Ma (T30–T28). After then, the canyon fillings were primarily made up of large scale MTDs, interrupted by small scale turbidity channels and thin pelagic mudstones. The Central Canyon can be divided into three types according to the main controlling factors, geomorphology-controlled, fault-controlled and intrusionmodified canyons. Among them, the geomorphology-controlled canyon is developed at the Ledong, Lingshui, Songnan and western Baodao Depressions, situated in a confined basin center between the northern slope and the South Uplift Belt along the Central Depression Belt. The fault-controlled canyon is developed mainly along the deep-seated faults in the Changchang Depression and eastern Baodao Depression. Intrusion-modified canyon is only occurred in the Songnan Low Uplift, which is still mainly controlled by geomorphology, the intrusion just modified seabed morphology. The full-filled time of the Central Canyon differs from west to east, displaying a tendency of being successively late eastward. The geomorphology-controlled canyon was completely filled before 3.8 Ma (T28), but that in intrusion-modified canyon was delayed to 2.4 Ma (T27) because of the uplifted southern canyon wall. To the Changchang Depression, the complete filling time was successively late eastward, and the canyon in eastern Changchang Depression is still not fully filled up to today. Difference in full-filled time in the Central Canyon is mainly governed by multiple sediment supplies and regional tectonic activities. Due to sufficient supply of turbidity currents and MTDs from west and north respectively, western segment of the Central Canyon is entirely filled up earlier. Owing to slower sediment supply rate, together with differential subsidence by deep-seated faults, the full-filled time of the canyon is put off eastwards gradually.
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影响因子：
1.8
作者：
Wei Xi;Jia Cheng;Menghan Wei
通讯作者：
Wei Xi;Jia Cheng;Menghan Wei
影响因子：
2.3
作者：
C. Ross;W. Gardner;M. J. Richardson;V. Asper
通讯作者：
C. Ross;W. Gardner;M. J. Richardson;V. Asper
影响因子：
--
作者：
Zhengtang Guo;Xiao-jun Yao;Xitao Zhao;Lanying Wei
通讯作者：
Zhengtang Guo;Xiao-jun Yao;Xitao Zhao;Lanying Wei
影响因子：
4.2
作者：
M. Deptuck;Z. Sylvester;C. Pirmez;C. O’Byrne
通讯作者：
M. Deptuck;Z. Sylvester;C. Pirmez;C. O’Byrne
DOI：
10.1016/s1251-8050(01)01557-9
发表时间：
2001-04
期刊：
Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule A-sciences De La Terre Et Des Planetes
影响因子：
--
作者：
P. Cirac;Jean-François Bourillet;R. Griboulard;A. Normand
通讯作者：
P. Cirac;Jean-François Bourillet;R. Griboulard;A. Normand