摘要
大风山天青石矿床位于柴达木盆地西北缘,由Ⅰ、Ⅱ、Ⅲ、Ⅳ四个矿区组成,赋矿地层为第三系上新统狮子沟组,矿体多呈薄层状、扁豆状或透镜状产于含炭钙质泥岩中,矿石主要为天青石、菱锶矿等。天青石与含矿岩石的ΣREE值较低,LREE/HREE=5.11～7.48,平均为6.58,为轻稀土富集型,Eu具显著正异常,容矿围岩Ce略显弱亏损性特征,显示成矿物质主要来源于深部热卤水;另外,柴达木盆地周缘富含有益元素流体通过化学、渗滤交代等作用后,将有益组分运移至盆地适宜部位富集成矿。由上所述,大风山地区天青石矿成矿物源主要来自于深部热卤水,盆地周缘陆缘碎屑含矿流体也有补给,反映成矿物源具多来源性特征。
Dafengshan celestine deposit is located in the northwestern Qaidam Basin, composed of four mining areas, named as Ⅰ、Ⅱ、Ⅲ and Ⅳ The ore - bearing strata is the Tertiary Pliocene calcareous shale formation of Shizigou group. The orebedies are mostly thin - bedded and lenticular occurring in carbonaceous calcareous shale. The main ore minerals are celes- tite and strontianite. Celestite and ore - bearing rocks are characteristed by the lower contents of ~ REE , LREE/HREE = 5.11 -7.48,with an average value of 6.58, exhibiting a light REE enrichment and a significant Eu positive anomaly. The weak cerium negative in the host rock suggests that the mineralizing materials mainly come from deep hot brine. In addition, rich beneficial element fluid in surrounding areas of Qaidam Basin migrated to appropriate locations through chemical, infiltration metasomatism and was mineralized.
出处
《稀土》
EI
CAS
CSCD
北大核心
2013年第1期41-48,共8页
Chinese Rare Earths
基金
青海三稀金属资源战略调查项目(2012000100630144)
973计划前期研究专项课题(2010CB434808)
关键词
大风山
天青石
稀土元素
地球化学特征
成矿物源
Dafengshan area
celestine
REE elements
geochemistry
oreforming material source
