东山湾重矿物组合规律、物质来源及环境意义

THE COMPOSITION AND MATERIAL SOURCES OF HEAVY MINERALS IN DONGSHAN BAY AND THEIR ENVIRONMENT MEANING

阐明了东山湾重矿物组合规律、物质来源、自生黄铁矿的富集与形成 环境。研究表明，湾内重矿物含量＜１％，来自漳江及周边水系。东山湾西部的 沉积环境有利于自生黄铁矿的形成。

The average content of heavy minerals in the Dongshan Bay is 0. 98%. It is lower than in other bays on the Fujian Coast. Main heavy minerals are magnetite, epidote, ardalusite, arthigenic pyrite. It hails from Zhangjiang River and adjacent small river. Composition of heavy minerals is controlled by peripheral rock types. There is not regression of coast erosion in Dongshan my. It is advantageous to keep the fine habit environment. Content of authigenic pyrite in west part of Dongshan Bay is higher than in east part and mouth of the bay. its sediment is silty mud. Content of organic carbon > 1 %,pH>7%,Eh＜O mV, and environment is of low energy.