【摘要】 对2008年采自杭州湾内的232个表层沉积物进行了碎屑矿物研究。结果表明,杭州湾沉积物中重矿物质量分数较低,平均为3.39%,重矿物以普通角闪石、绿帘石为主,富含云母类片状矿物,稳定矿物如钛铁矿、石榴子石、锆石、榍石等质量分数较低。轻矿物以石英、长石为主,绢云母为特征矿物,物源指示意义大。重矿物中优势矿物(普通角闪石,绿帘石)、赤铁矿和褐铁矿以及特征片状矿物可以作为沉积物输送和扩散的指标,碎屑矿物分布特征表明杭州湾表层沉积物以长江输入为主,湾内南部沉积物中混有钱塘江及周边河流的输入物质,岛屿侵蚀产物对沉积物碎屑矿物组成影响有限。更多还原

【Abstract】 A total of 232 surface samples collected from the hangzhou bay in 2008 were analyzed for detrital minerals.The results show that the content of heavy minerals is low with an average of 3.39%.The dominant heavy minerals are hornblende and epidote.mica is rich in the sediments.Some stable minerals such as ilmenite,garnet,zircon and sphene have lower content than others.The dominant light minerals are quartz and feldspar,and characteristic mineral is sericite,which is of great significance for the indication of material sources.The dominant heavy minerals,the ferric oxide minerals and the schistose mineral can be used as an indicator for tracing the transporting and diffusing direction of the sediment.According to the distribution pattern of detrital minerals,it is concluded that the sediments in the Hangzhou Bay are mainly derived from the Changjiang River,but in the southern Hangzhou Bay the sediments are immingled with material from the qiantang river and other local rivers.The sediments eroded from the islands play a limited role for the detrital mineral composition in the Hangzhou bay.更多还原