柿竹园矽卡岩型钨锡钼铋矿床主要造岩矿物中REE的分布特征及成岩意义

REE DlSTRIBUTION PATTERN AND THEIR IMPLICATIONS OF ROCK-FORMING MINERALS FROM SHIZHUYUAN SKARN-TYPE W,Sn,Mo AND Bi DEPOSIT,SOUTH CHINA

通过对柿竹园矽卡岩型钨锡钼铋矿床中主要造岩矿物、矿化围岩和成矿母岩中稀土元素分布特征的分析对比，得出该矽卡岩的形成是以轻稀土富集为特征的佘田桥组含泥质条带灰岩与富含重稀土且强烈亏损铕的千里山花岗岩流体相互作用的产物。稀土元素在矽卡岩中的分布和分配明显地受到被交代原岩中的稀士含量、流体中的稀土组成和矽卡岩矿物本身容纳稀土的能力等因素控制。

The Shizhuyuan W-,Sn-,Mo- and Bi-bearing skarn occurs in the contact metamorphic zone of the Qianlishan two-mica granite which intrudes into the Upper Devonian Shetianqiao Formation carbonate rocks.The REE abundance distribution pattern of the skarn-forming minerals indicates that this skarn deposit formed by the interaction of the carbonate rocks and shales,which have relatively high LREE contents and a slightly negative Eu anomaly,with the fluids mainly derived from magma characterized by a slight HREE enrichment and strongly negative Eu anomaly.The ore-forming elements,W,Sn,Bi and Mo,may have been introduced by the hydrothermal solutions derived from granite.