福建兴化湾表层沉积物中重矿物组分及其分布特征

对兴化湾17个站位表层沉积物中63～125μm粒级重矿物组分、含量、组合及分布特征进行了分析研究,并探讨了泥沙物质来源及重矿物与沉积环境的关系.结果表明,兴化湾重矿物平均含量(质量分数)为12.08%,高出其邻近的湄州湾(5.67%)6个百分点;重矿物共计37种,以磁铁矿、角闪石、绿帘石、钛铁矿、赤铁矿、褐铁矿、锆石为主.矿物种类揭示该海湾的泥沙主要来源于湾顶河流输入和周边陆域及湾内岛屿基岩风化侵蚀产物,而湾口以外海域的输入物质较少;依据主要重矿物含量和分布特征,将兴化湾划分为4个矿物组合区,各区重矿物组合类型不仅与物质来源有关,而且受水动力条件和沉积环境制约.

The characteristics of heavy minerals composition and distribution in surface sediment from the Xinghua Bay of Fujian

The composition,assemblage and distribution characteristics of heavy minerals from 63 to 125 μm grainsizes in surface sediment from the Xinghua Bay (17 stations) are studied.And then,matter source of silt and relationship of heavy minerals with sedimentary environment are discussed.The results show that there are 37 kinds of heavy minerals and the average content of them is 12.08% which exceeds 6% compared with the Meizhou Bay (5.67%).The dominant minerals are magnetite,hornblende,epidote,ilmenite,hematite,limonite,zircon and so on.Mineral kinds reveal that silt in this bay mainly comes from fluvial input and eroded products of bedrock in circumjacent land and islands of the Xinghua Bay,however,the matter origin from outside area of this bay is less.The Xinghua Bay can be divided into 4 mineral assemblage zones based on heavy mineral contents and distribution characteristics,which are not only related to matter source,but also controlled by hydrodynamic condition and sedimentary environment in the Xinghua Bay.