琼东南盆地中央峡谷上新世块体搬运沉积的地震特征与分布:琼东南盆地中央峡谷上新世块体搬运沉积的地震特征与分布

海洋地质与第四纪地质 Pub Date : 2014-03-06 DOI:10.3724/SP.J.1140.2013.02009

W. Li, Shiguo Wu, Xiujuan Wang, Dawei Wang, F. Zhao

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引用次数: 2

摘要

琼东南盆地深水区二维/三维地震资料及三维地震资料相干性揭示了盆地中央峡谷多期块体搬运矿床的赋存特征。该地区的MTDs由三个单元组成，即顶壁域、平动域和趾部域，具有不同的地震特征。大尺度MTDs是新近纪以来琼东南盆地中央峡谷深水沉积的重要组成部分，对深水盆地沉积物的空间分布具有重要影响。上新世MTDs分布面积为300 km2，厚度可达240 m，呈扇形平面分布。快速的沉积流量和活跃的构造运动可能是琼东南盆地中央峡谷MTDs发育的主要原因，此外，地震和海平面波动对MTDs的形成也有重要影响。

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SEISMIC CHARACTERISTICS AND DISTRIBUTION OF PLIOCENE MASS TRANSPORT DEPOSITS IN CENTRAL CANYON OF QIONGDONGNAN BASIN: SEISMIC CHARACTERISTICS AND DISTRIBUTION OF PLIOCENE MASS TRANSPORT DEPOSITS IN CENTRAL CANYON OF QIONGDONGNAN BASIN

2D/3D seismic data and coherence of 3D seismic data in the deepwater area of Qiongdongnan Basin reveal the occurrence of multi-stage mass transport deposits(MTDs) in the Central Canyon of the basin.The MTDs of this region consist of three units,namely the headwall domain,the translational domain and the toe domain characterized by different seismic characteristics.Being regarded as an important part of deepwater deposition in the Central Canyon of Qiongdongnan Basin since Neogene,the large-scale MTDs have an important effect on the spatial distribution of sediment in the deepwater basin.The Pliocene MTDs are distributed in an area of 300 km2,with a thickness up to 240 m in a fan shape in planar distribution.The rapid sedimentary discharge and active tectonic movement may be the main reasons for the development of the MTDs in Central Canyon of Qiongdongnan Basin..In addition,earthquakes and fluctuation of sea level have a significant effect on the formation of the MTDs.

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来源期刊

海洋地质与第四纪地质

CiteScore

0.10

自引率

0.00%

发文量

4176

期刊介绍： Marine Geology and Quaternary Geology launched in 1981 is a bimonthly academic journal sponsored by Qingdao Institute of Marine Geology, China Geological Survey, and published by the Science Press, China.The journal aims to publish original, cutting-edge, and explorative scientific results in the field of marine geology and sea-land Quaternary geology. The journal focus on reporting the latest research achievements supported by National Natural Science Foundation Project, National Key Project and International Cooperation Project, with priority to the results in China seas, global ocean and three poles, and the comparative study results between offshore and land, regional and global scientific issues.