Seismic Recognition and Origin of Miocene Meishan Formation Contourite Deposits in the Southern Qiongdongnan Basin,Northern South China Sea

查看全文 作　　者：FENG [1,2,3,4]Yangwei;REN [1]Yan;LYU [5]Chengfu;ZHANG [1]Peng;CHEN [6]Ying;JIN [4]Li

机构地区：[1]School of Geographical Science and Tourism,Nanyang Normal University,Nanyang,Henan 473061,China;[2]Shandong Key Laboratory of Depositional Mineralization&Sedimentary Mineral,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;[3]School of Earth Sciences,East China University of Technology,Nanchang 330013,China;[4]PetroJindian(Beijing)Sci-Tech Co.,Ltd,Beijing 100000,China;[5]Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;[6]CNOOC Research Institute Co.,Ltd.,Beijing 100028,China

出　　处：《Acta Geologica Sinica(English Edition)》索引2021年第95卷第1期,共11页

基　　金：supported by the National Natural Science Foundation of China(grant no.41972155);the Jiangxi Provincial Natural Science Foundtion(grant no.2020BABL211019);the National Science and Technology Major Profect(grant no.2016ZX05026007)。 摘　　要：Research into the contourite deposits in the Upper Meishan Formation of the southern Qiongdongnan Basin in South China Sea is weak;their characteristics,distribution and original geological conditions are not clear.Using geologic al and geophysical methods including seismic and drilling data,based on seismic reflection characteristics,geometrical configuration description,and wave impedance inversion,two types of contourite deposits are recognized.Contourite deposits have blurred boundaries between each deposit and disordered internal seismic reflections;They are mound-shaped only in transverse section,and banded in the longitudinal direction.TypeⅠcontourite deposits are conical,with mediumhigh amplitude,low-continuity,low-frequency mound-shaped seismic facies,and subparallel-chaotic reflections internally.These deposits are conical with sharp tops,the canal between mounds is V-shaped and deep.The western wing is gentle and the eastern wing is steep,with the slope toe mostly between 10°and 20°,and width height ratio about 1-2.TypeⅡcontourite deposits are flat,exhibiting medium-amplitude,medium-continuity,low-frequency mound-shaped seismic facies,with subparallel weak reflections internally.Their mounds are flat with gently arced tops,with shallow canals between.The slope toe is between 5°and 10°,with a width height ratio of about 2-5.The wave impedance value of these contourite deposits is 4.6 kg/m^(3)×m/s to 6.8 kg/m^(3)×m/s,about 5.8 kg/m^(3)×m/s on average,which is presumed to represent marlycalcareous clastic sediments.The contourite deposits mainly develop beneath the slope break at the margin of the faultcontrolled platform in the Southern Uplift zone of the basin.In plane view,they are distributed approaching a west-to-east direction,and in section,lie in low-lying areas near the faults at fault-controlled terraces of the Southern Uplift zone,with a paleo-current direction nearly west-to-east.The paleotectonic setting of the gentle monoclinic platform was favorable for the development of such contourite deposits.The intensification of the Mid-Miocene deepest bottom current gave rise to the contourite-forming currents around the Southern Uplift zone in the northern South China Sea,which flow from Hainan Island to the Xisha Trough in a nearly west-to-east direction leading to the contourite deposits developing in the late MidMiocene transgressive environment,with multiple slow sea-level fall cycles. 关键词：CONTOURITES seismic reflection characteristics MIOCENE Qiongdongnan basin South China

相关文献

参考文献（52）
引证文献（1）
耦合文献（722）

参考文献(52)

引证文献(1)

耦合文献(722)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Seismic Recognition and Origin of Miocene Meishan Formation Contourite Deposits in the Southern Qiongdongnan Basin,Northern South China Sea

参考文献(52)

引证文献(1)

耦合文献(722)

用户提示