重庆玉峡锶矿床中分散元素锶的超常富集机制

The Extraordinary Enrichment of Strontium Element in the Yuxia Large Strontium Deposit, Chongqing

重庆玉峡锶矿床位于华蓥山构造带的南段。含矿岩系为下三叠统嘉陵江组二段一亚段的含藻含膏白云岩，含矿层位自下而上有三个矿层。矿层呈似层状、透镜状赋存于西山背斜北段的背斜转折端及相邻两翼的层间虚脱部位。矿石矿物有天青石、菱锶矿、钡天青石，脉石矿物为白云石、...

The Yuxia strontium deposit is the largest strontium deposit in China. It is situated in the easpatern part of Sichuan basin This paper discusses the mechanism the extraordinary enrichment of dispersed strontium element in the Yuxia strontium deposit from the angle of mineralization by basin fluids. Based on the study of geological characteristics, fluid inclusions and stable isotopes of the Yuxia strontium deposit, the paper indicated that the extraordinary enrichment of strontium was the corresponding result of tectonic evolution of Sichuan basin and multiple superimposed mineralizations The enrichment of strontium in the Yuxia strontium deposit was divided into four stages:sedimentary diagenetic incipient enrichment stage, hot brine mineralization stage, hot brine dynamic mineralization stage and supergene enrichment stage.