Mineralization of Yangshan Fluorite Deposit in Luanchuan County, Henan Province: Constraints from H-O Isotopes and Element Geochemistry
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摘要: 杨山萤石矿床萤石储量居河南省首位，规模已达超大型，为典型的热液萤石矿床。萤石矿物流体包裹体水中δ18O介于-8.9‰~-5.5‰，平均值为-7.4‰，δD介于-88.6‰~-76.1‰，平均值为-83.27‰；石英矿物流体包裹体水中的δ18O介于-3.8‰~-2.8‰，平均值为-3.3‰，δD介于-94.5‰~-94‰，平均值为-94.25‰，表现出明显的岩浆热液和大气降水混合特征，与同区域马丢萤石矿、石门寨萤石矿床石英的H、O同位素特征虽有差异，但基本一致。说明该区萤石矿床与燕山期花岗岩关系密切，且成矿后期成矿流体中明显混入了大气降水；围岩和矿石的稀土元素特征显示该矿床矿化蚀变过程中没有外来成分的加入，成矿物质来源为幔源或下地壳，且其沉淀时成矿流体为温度较低的还原环境。Abstract: The Yangshan fluorite deposit has been found to be the first fluorite mineral reserve in Henan Province, and its scale has reached a super large scale. Its metallogenic geological background and deposit geological characteristics show typical hydrothermal fluorite deposit characteristics. The results show that the δ 18O in the fluid inclusion water of the Yangshan fluorite deposit is between-8.9 ‰ and-5.5 ‰, with an average of-7.4‰; δ D is between-88.6 ‰ and-76.1 ‰, with an average of-83.27‰; the δ18O in the fluid inclusion water is between-3.8 ‰ and-2.8 ‰, with an average of-3.3 ‰, and δ D is between-94.5 ‰ and-94.25 ‰, showing obvious magmatic hydrothermal and hydrothermal characteristics The mixing characteristics of gas and precipitation are different from the H and O isotopic characteristics of quartz in madui fluorite deposit and shimenzhai fluorite deposit in the same area, but basically consistent, suggesting that the fluorite deposit in this area is closely related to Yanshanian granite, and meteoric water is obviously mixed into the ore-forming fluid in the later stage of mineralization; the REE characteristics of wall rock and ore show that there is no external change in the mineralization and alteration process of the deposit In addition, the ore-forming materials are derived from mantle or lower crust, and the ore-forming fluid is in a lower temperature reduction environment.
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Key words:
- Yangshan /
- fluorite deposit /
- H-O isotopes /
- element geochemistry
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