Sedimentary characteristics and genetic mechanism of the giant ancient pockmarks in the Qiongdongnan Basin,northern South China Sea  

作　　者：Pengfei Xiong Cong Cheng Zenggui Kuang Jinfeng Ren Jinqiang Liang Hongfei Lai Zigui Chen Jiang Lu Xiaoyu Fang Tao Jiang 

机构地区：[1]Hubei Key Laboratory of Marine Geological Resources,China University of Geosciences,Wuhan,430074,China [2]Guangzhou Marine Geological Survey,Ministry of Natural Resources,Guangzhou,510075,China [3]Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang),Zhanjiang,524088,China

出　　处：《Acta Oceanologica Sinica》2023年第2期120-133,共14页海洋学报（英文版）

基　　金：The National Natural Science Foundation of China under contract No.41976073;the Guangdong Major Project of Basic and Applied Basic Research under contract No.2020B0301030003;the Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang)Project under contract No.ZJW-2019-03;the China Geological Survey Project under contract No.DD20190230.

摘　　要：In the late Miocene,giant ancient pockmarks,which are fairly rare globally,developed in the Qiongdongnan Basin.In this paper,to determine the sedimentary characteristics and genetic mechanism of these giant ancient pockmarks in the Yinggehai Formation of the Qiongdongnan Basin,based on high-resolution 3D seismic data and multiattribute fusion technologies,we analyzed the planar distribution and seismic facies of the ancient pockmarks and compared the characteristics of the ancient pockmarks with those of channels,craters,and hydrate pits.Moreover,we also discussed the implications of the fluid escape system and paleo-bottom current activity in the ancient pockmark development area and analyzed the influence of the ancient pockmarks on the paleoclimate in this region.Finally,an evolutionary model was proposed for the giant ancient pockmarks.This model shows that the giant ancient pockmarks in the southern Qiongdongnan Basin were affected by both deep fluid escape and lateral transformation of paleobottom currents.In addition,the giant ancient pockmarks contributed to the atmospheric CO_(2)concentration in the late Miocene and played a great role in the contemporary evaluation of deepwater petroleum exploration.

关 键 词：giant ancient pockmark bottom current fluid escape Yinggehai Formation Qiongdongnan Basin 

分 类 号：P736[天文地球—海洋地质]