渤海海峡西南部海底沉积物重矿物组成与物源  

Composition and provenance of heavy minerals in surface sediments in the southwestern Bohai Strait

作　　者：王庆同 赵吉圆 王海根 杨鹏 宇星辰 张家浩 毛方松 刘金庆 WANG Qingtong;ZHAO Jiyuan;WANG Haigen;YANG Peng;YU Xingchen;ZHANG Jiahao;MAO Fangsong;LIU Jinqing(Yantai Center of Coastal Zone Geological Survey,China Geological Survey,Yantai 264000,China;College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao 266590,China)

机构地区：[1]中国地质调查局烟台海岸带地质调查中心,烟台264000 [2]山东科技大学地球科学与工程学院,青岛266579

出　　处：《海洋地质前沿》2023年第6期22-31,共10页Marine Geology Frontiers

基　　金：中国地质调查局项目“渤海海峡南部海岸带1:5万综合地质调查”(DD20211578);国家自然科学基金(41706074)。

摘　　要：渤海海峡是黄渤海交接地带,周边岛屿散布,地形条件复杂,沉积物类型丰富,是研究海洋动力系统的热点地区之一。通过对32个表层沉积物的重矿物分析,研究了渤海海峡西南部海域的重矿物组成、分布和物质来源。结果表明,研究区矿物组合为普通角闪石-绿帘石-黑云母-褐帘石,可将其划分成3个矿物分区。庙岛群岛矿物区(Ⅰ区)为普通角闪石-绿帘石-钛铁矿-石榴子石矿物组合,物质主要来自庙岛群岛岛屿冲刷物;中部矿物区(Ⅱ区)为普通角闪石-绿帘石-黑云母矿物组合,主要来源于黄河物质;西部矿物区(Ⅲ区)为普通角闪石-绿帘石-黑云母-褐帘石矿物组合,是黄河物质、山东半岛及庙岛群岛岛屿冲刷物的混合物。不同来源的物质在海洋动力综合作用下进行搬运、沉积,最终导致了矿物组合分区之间的物质差异。The Bohai Strait is the channel connecting the Bohai Sea to the Yellow Sea for material and energy exchange,which has complex topographical conditions and abundant sediment types.It is one of the hotspots to study the marine dynamic systems.Thirty-two surface sediments collected in 2021 from the southwestern Bohai Strait were analyzed on the heavy minerals in terms of their composition,distribution,and provenance.Results show that the mineral assemblages were characterized by hornblende-epidote-biotite-orthite and they were from three mineral assemblages/provinces:the Miaodao Islands(I)has a hornblende-epidote-ilmenite-garnet assemblage derived mainly from the scours of the Miaodao Islands,the Central Zone(II)has a hornblende-epidote-biotite assemblage largely attributed to the Yellow River materials,and the Western Zone(III)has a hornblende-epidote-biotite-orthite assemblage that is a mixture of the Yellow River sediments and scours from the Shandong Peninsula and Miaodao Islands.Materials from different sources were transported and deposited under overall marine forces,which eventually resulted in the differences in mineral assemblages of the area.

关 键 词：渤海海峡 重矿物分布 组合分区 物源 

分 类 号：P736[天文地球—海洋地质]