贵州紫云方解石矿床地球化学特征及成因研究

发布时间：2018-06-11 12:17

  本文选题：地球化学特征 + 碳、氧同位素　； 参考：《现代地质》2017年04期

【摘要】：贵州紫云方解石矿床是在贵州西南部新发现的非金属矿床,方解石矿体呈脉状、透镜状和似层状产出。对紫云火山关、达则等方解石矿床开展同位素地球化学及微量元素、稀土元素研究,结果表明碳、氧同位素显示成矿物质来源于海相碳酸盐岩,成矿流体以富含HCO_3~-为主,大气水参与成矿,与岩浆作用关系不大。其中达则矿段相对于围岩,成矿物质具有较高的Sr、Zn和Ni含量,稀土元素配分曲线明显区别于围岩,δEu显示正异常等特征,暗示可能有深部流体参与成矿。火山关、打劳等其他矿段,矿体和围岩具有相似的稀土配分模式和∑REE变化规律,表明成矿物质来源于碳酸盐岩围岩。通过区域成矿作用比较,认为成矿时代可能属于印支—燕山期。
[Abstract]:Ziyun calcite deposit is a newly discovered nonmetallic deposit in southwestern Guizhou. The calcite orebody is vein-like, lenticular and stratiform. The isotopic geochemistry, trace elements and rare earth elements of calcite deposits such as Ziyun volcano and Daze are studied. The results show that the carbon and oxygen isotopes are derived from marine carbonate rocks, and the ore-forming fluids are mainly rich in HCO _ 3-. Atmospheric water is involved in mineralization and has little to do with magmatism. Compared with the surrounding rock, the ore-forming material in the Dazi section has a higher content of Sr-Zn and Ni, the distribution curve of rare earth elements is obviously different from the surrounding rock, and 未 EU shows positive anomalies, suggesting that deep fluids may be involved in the mineralization. The orebody and surrounding rock have similar REE distribution model and 鈭，

本文编号：2005218