辽东湾周边河流沉积物碎屑矿物组成及其物源意义

对辽东湾周边七条河流下游段河漫滩沉积物的碎屑矿物进行了鉴定，分析了轻重矿物组分的差异、流域基岩类型和沉积物粒度对碎屑矿物组成的影响。轻矿物组成以石英和长石占绝对优势。由于辽东湾西侧河流（六股河、小凌河和大凌河）和东侧河流（双台子河、大辽河、复州河）位于两个构造块体之上，不同的基岩类型导致重矿物组合差别很大。湾西河流普通角闪石含量低、金属矿物含量高，湾东河流则相反，这两种组分能有效区分辽东湾东西两侧的河流，同时也可将滦河与上述河流区分开。石榴子石和普通辉石含量特征可区分湾西三条河流，特征为大凌河前者含量高，小凌河后者含量高，六股河两者含量都很低。绿帘石和阳起石的含量在湾东河流沉积物中差别较大，特征为双台子河前者含量高，大辽河后者含量高，复州河两者含量都很低。七条河流片状矿物和碳酸盐矿物含量低的特征有别于黄河沉积物。

Detrital Minerals in the Surrounding River Sediments, Liaodong Bay,Bohai Sea: Composition and its Geological Significance

According to the characteristics of detrital minerals in downstream floodplain sediments from seven rivers around Liaodong Bay, detrital mineral assemblages among the rivers, and impacts of rocks in drainage basin and sediment grain size on detrital mineral assemblages were analyzed. Light mineral assemblages are mainly Quartz, Plagioclase and Potassium Feldspar. Because rivers flowing in western Liaodong Bay (Liuguhe, Xiaolinhe, Dalinghe) and rivers flowing in eastern Liaodong Bay (Shuangtaizihe, Daliaohe, Fuzhouhe) are located on two tectonic blocks separately, different rock types in drainage basin lead to prominent discrepancies of heavy mineral assemblage in river sediments. The western rivers are characterized by low hornblende and high metal minerals, but the eastern rivers are reverse, so that these two compositions can identify rivers flowing in western and eastern Liaodong Bay effectively, and they can also separate Luanhe sediment from rivers in Liaoning. The garnet and augite can distinguish the three rivers flowing in western Liaodong Bay, because content of the garnet is high in Dalinghe, the augite is high in Xiaolinghe, and both are low in Liuguhe. The epidote and actinolite can differentiate the three rivers flowing in eastern Liaodong Bay, because content of the epidote is high in Shuangtaizihe, the actinolite is high in Daliaohe, and both are low in Fuzhouhe. Low contents characteristics of schistose minerals and carbonate minerals of these seven rivers are different from Huanghe sediments.