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通过本海区156个表层沉积样品和主要河流自然重砂的鉴定分析,掌握了本区重矿物的分布规律。主要矿物有角闪石、绿帘石、金属矿物;标志性矿物有屑石、石榴石、辉石和自生黄铁矿。根据主要矿物和标志诖矿物含量变化及分布特征,划分五个矿物组合区,各组合区矿物组合特征指明了海区物质来源及泥沙运移趋势。海区物质主要来源于河流,除此,少量的物质来源于岛岸海蚀物质和特殊海区的化学或生物化学沉积。
Through the analysis of 156 surface sediment samples in the sea area and the natural heavy sand of the major rivers, the distribution rules of heavy minerals in this area were mastered. Major minerals include amphibole, epidote, metallic minerals; signature minerals such as crumb, garnet, pyroxene and authigenic pyrite. According to the changes of mineral content and distribution characteristics of main minerals and signs, five mineral assemblages are divided. The characteristics of mineral assemblages in each assemblage indicate the source of materials and the tendency of sediment transport. In addition, a small amount of material comes from chemical or biochemical sedimentation of sea-island substances and special sea areas on the island.