连云港海州湾近海碎屑沉积物矿物组成及特征分析  

Mineral compositions and characteristics of the offshore clastic sediments in Haizhou Bay,Lianyungang City

作　　者：汤倩 闫玉茹 周欣 池野 欧阳凯 窦传伟 平利姣 TANG Qian;YAN Yuru;ZHOU Xin;CHI Ye;OUYANG Kai;DOU Chuanwei;PING Lijiao(Institute of Geochemical Exploration and Marine Geological Survey, Jiangsu Non-ferrous Metals East China Geological Exploration Bureau, Nanjing 210007, Jiangsu, China)

机构地区：[1]江苏省有色金属华东地质勘查局地球化学勘查与海洋地质调查研究院,江苏南京210007

出　　处：《华东地质》2021年第2期239-245,共7页East China Geology

基　　金：江苏省国土资源厅“江苏省连云港市海州湾近海海砂资源潜力调查(编号:苏财建[2014]278号)”;江苏省海洋科技创新专项“江苏重大海洋工程环境影响后评估及指标体系研究(编号:Hy2019-4)”项目联合资助。

摘　　要：稳定重矿物的特征指数可较好地反映沉积物的物源信息。在连云港海州湾地区入海河流及海域中采集碎屑沉积物,分析海州湾近海碎屑沉积物的矿物组成及特征。海州湾地区近海沉积物中的轻矿物主要由石英和长石组成,重矿物主要由锆石、钛铁矿、绿帘石、角闪石、榍石和石榴石组成。重矿物特征指数分析表明:海州湾近海海砂沉积物是河口浅海环境的产物,砂矿主要来源于连云港地区花岗岩、片麻岩和榴辉岩,属于河海作用成因的滨海沉积型矿床。The characteristic indexes of stable heavy minerals can well reflect the provenance informations of sediments.The clastic sediments are collected from the rivers flowing into sea and sea areas in Haizhou Bay of Lianyungang City to analyze the mineral compositions and characteristics of offshore clastic sediments.The light minerals in the offshore sediments are mainly composed of quartz and feldspar,while the heavy minerals consist of zircon,ilmenite,epidote,hornblende,sphene and garnet.The analysis of heavy mineral characteristic indexes shows that the offshore seasand sediments are the products of estuarine-neritic environment,with the placers mainly from the granite,gneiss and eclogite of Lianyungang area,belonging to the littoral sedimentary type of river-sea interaction.

关 键 词：海州湾 重矿物特征指数 物质来源 海砂成因 滨海沉积型矿床 

分 类 号：P722.5[天文地球—海洋科学] P736.2