九龙江口沉积物中重矿物组成及其分布特征

Characteristics of Heavy Minerals Composition and Distribution in Sediment from Jiulong River Estuary

利用 1994 年海岛调查和 1999 年执行福建省自然科学基金项目所采集的底质样品，分析研究了九龙江口表层沉积物中 0.063～0.125 mm 粒级的重矿物组分、组合及其分布特征。结果表明，该粒级重矿物计有 49 种，其优势和特征矿物为磁铁矿、赤铁矿、绿帘石、钛铁矿、褐铁矿、角闪石、锆石、红柱石、黑云母等；重矿物的平均含量为 9.38 %；依据主要重矿物的含量和分布特征，将九龙江口划分为 4 个矿物组合区 (Ⅰ. 河道口门矿物区；Ⅱ. 河口北部矿物区； Ⅲ. 河口南部矿物区；Ⅳ. 湾口东部矿物区)，各区的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的控制。

:The bottom sediment samples were gathered during the island investigation in 1994 and in carrying out the natural science fund project of Fujian in 1999. The composition, distribution and assemblage characteristics of heavy minerals which granularity distribute from 0.063 to 0.125 mm in sediment from Jiulong River estuary are studied in the paper. The results show that there are 49 kinds of heavy minerals and the average content of them is 9.38 %. The dominant and characteristic minerals are magnetite, hematite, epidote, ilmenite, limonite, hornblende, zircon, andalusite, biotite and so on. Four mineral assemblage zones (Ⅰ.The watercourse gateway of Jiulong River mineral zone, Ⅱ. The northern estuary of Jiulong River mineral zone, Ⅲ. The southern estuary mineral zone, and Ⅳ. The eastern estuary of Jiulong River mineral zone) can be divided based on the heavy mineral contents and the distribution characteristics, which not only relate to the mineral resources but also are controlled by the hydrodynamic conditions and the sediment environment in Jiulong River estuary.