中国陆架海MIS5(74~128 ka)以来地层及其沉积环境  

The stratigraphy and depositional environments of China’s sea shelves sinceMIS5(74-128)ka

作　　者：王中波[1,2] 张江勇 梅西[1,2] 陈晓辉[1,2] 赵利 张勇[1,2] 张志珣 李学杰[3] 李日辉[1,2] 陆凯 孙荣涛[4] 杨守业 WANG Zhongbo;ZHANG Jiangyong;MEI Xi;CHEN Xiaohui;ZHAO Li;ZHANG Yong;ZHANG Zhixun;LI Xuejie;LI Rihui;LU Kai;SUN Rongtao;YANG Shouye(Key Laboratory of Gas Hydrate,Ministry of Natural Resources,Qingdao Institute of Marine Geology,Qingdao 266071,Shandong,China;Laboratory for Marine Mineral Resources,Qingdao National Laboratory for Marine Science and Technology,Qingdao 266071,Shandong,China;Guangzhou Marine Geological Survey,Guangzhou 510075,Guangdong,China;School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255049,Shandong,China;State Key Laboratory of Marine Geology,Tongji University,Shanghai 200092,China)

机构地区：[1]自然资源部天然气水合物重点实验室,青岛海洋地质研究所,山东青岛266071 [2]青岛海洋科学与技术试点国家实验室海洋矿产资源评价与探测技术功能实验室,山东青岛266071 [3]自然资源部海底矿产资源重点实验室,广州海洋地质调查局,广东广州510760 [4]资源与环境工程学院,山东理工大学,山东淄博255049 [5]海洋地质国家重点实验室,同济大学,上海200092

出　　处：《中国地质》2020年第5期1370-1394,共25页Geology in China

基　　金：中国地质调查局海洋区域地质调查项目(DD20160137,DD20160138,DD20190208,GZH201400201);国家自然科学基金项目(41876059,41706069)联合资助。

摘　　要：基于中国海陆架28个晚第四纪钻孔实测数据和典型高分辨率地震剖面的综合地层分析,对比区内已有46个钻孔的研究成果,系统地开展晚第四纪地层特征识别和沉积环境重建。研究表明,MIS5以来中国海陆架沉积记录了3次明显的海侵过程,发育了3个相对完整的海相地层。其中,渤海和东海MIS3和MIS1相对较薄,而黄海海相地层较厚。渤海和黄海末次冰期的地层保存较少,东海外陆架末次冰期地层发育完整,较完整地记录10万年以来的沉积记录。南海晚更新世内陆架以滨岸和陆相沉积为主,外陆架为滨岸和浅海沉积;全新世发育浅海沉积。总体上,中国海陆架晚第四纪以来沉积环境演变依次是MIS5(74~128 ka)的浅海-滨海海相沉积,MIS4(60~74 ka)陆相潟湖-河流-滨海河口相沉积,MIS3(24~60 ka)浅海相-滨海潮坪沉积,MIS2(12~24 ka)/LGM时期陆相-河流相沉积,MIS1(现在~12 ka)/全新世海侵潮流砂和浅海泥质沉积。此外,新构造运动和区域沉降作用对地层的发育和保存具有一定的影响。上述认识为深入研究中国晚第四纪沉积与全球气候变化对比提供直接依据。Based on the comprehensive analysis of 28 boreholes of late Quaternary sedimentation and the high-resolution seismic profiles,the authors studied the stratigraphic characteristics identification and sedimentary environment rebuilding by comparing the results of other 46 boreholes as references in China’s sea shelves.Three distinct transgression processes were discovered in the shelves of China’s sea areas,with 3 marine strata well preserved.The strata of MIS1 and MIS3 are relatively thin in the Bohai Sea and the East China Sea,but thick in the Yellow Sea.There exists little sedimentation of Last Glacial period in the Bohai Sea and the Yellow Sea,but there have been quite integrated sedimentation units without obvious hiatus in the East China Sea since 100 ka B.P..There were coastal and continental deposits in the inner shelf and nearshore and neritic deposition in the outer shelf of the South China Sea during late Pleistocene,with neritic sedimentation in Holocene.As a whole,the sedimentary environment changes of China’s sea shelves since MIS5 in turn primarily were neritic and offshore deposits in MIS5(74-128 ka),continental sedimentation of lagoon-fuvial-coast in MIS4(60-74 ka),neritic and tidal flat deposits in MIS3(24-60 ka),terrestrial or fluvial sedimentation in MIS2(12-24 ka),and tidal sand ridge and neritic deposition in Holocene.Furthermore;the neotectonic movement and regional subsidence also influenced the late Quaternary stratigraphic development and their preservation in China seas.The results will provide direct evidence for the study of China’s Quaternary sedimentation and global climate changes.

关 键 词：中国海 MIS5 陆架 全球气候变化 海平面变化 沉积地层 沉积环境 海洋地质调查工程 

分 类 号：P736.223[天文地球—海洋地质]