晓天卢镇关岩群斜长角闪岩类地球化学特征及其与金矿的成因关系

GEOCHEMICAL FEATURES OF AMPHIBOLITES OF THE LUZHENGUAN GROUP COMPLEX AND THEIR RELATIONSHIP WITH ORIGIN OF GOLD DEPOSIT IN XIAOTIAN

通过斜长角闪岩类岩石学特征,岩石地球化学特征、微量元素、稀土元素数据进行计算与分析,探讨了其成因类型及变质岩原岩恢复,属于中基性—中酸性火山岩。晓天火山沉积洼地中火山岩、火山碎屑岩在稀土元素特征曲线的相似性确定火山岩物源来源于基底岩系卢镇关岩群中基性—中酸性火山岩。根据斜长角闪岩、火山岩、火山碎屑岩含金丰度的研究,认为区内金矿床的成矿物质与卢镇关岩群中斜长角闪岩类岩石存在密切关系,其物源主要为卢镇关岩群中斜长角闪岩类。

Based on calculation and analysis of petrological features, petrogeochemical features, trace elements, REE data of amphibolites, this paper discussed the genetic type and parent rock reconstruction of metamorphic rock, and classified it into intermediate-basic to intermediate-acid volcanic rock. Due to similarity in REE characteristic curve, volcanic rock and volcaniclastic rock in the Xiaotian sedimentary depression are thought to have been sourced from basement rock series of the Luzhenguan group complex intermediate-basic to intermediate-acid rock. Based on study of gold abundance in amphibolite, volcanic rock and volcaniclastic rock, it is suggested that ore-forming material of gold deposit is closely related to amphibolites in the Luzhenguan group complex, with amphibolites as the major source material.