| 内蒙古喀喇沁旗地区萤石矿床地质特征及成因探讨 |
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| 作者姓名： | 张成信 商朋强 焦森 魏龙飞 赵寒 姜振宁 曹光远 代晓光 王艳超 |
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| 作者单位： | 1.中化地质矿山总局地质研究院,北京 100101;2.中化地质矿山总局,北京 100101 |
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| 基金项目： | 中国地质调查局“东部地区硼磷萤石等重要非金属矿产调查(编号: DD20160057)”“江西赣南—福建浦城地区战略性萤石硼资源调查(编号: DD20190816)”“内蒙古喀喇沁旗大西沟一带萤石矿资源调查项目(编号: DD20160057-07)”项目联合资助 |
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| 摘 要： | 为进一步明确内蒙古喀喇沁旗地区萤石矿床的成因,为该区下一步萤石矿找矿勘查工作提供参考,在系统总结研究区萤石矿床地质特征及分布规律的基础上,通过分析典型萤石矿床围岩和萤石的微量元素及稀土元素地球化学特征,探讨萤石矿床的成因及成矿物质来源。结果表明,喀喇沁旗地区萤石矿中萤石的Cu、Pb和Zn含量较低,轻稀土元素略富集,稀土元素总量相对较低,说明该区萤石矿成矿流体为岩浆期后热液成因的可能性较小; 萤石矿与赋矿围岩的球粒陨石标准化稀土元素配分曲线相似且同步,当围岩为黑云母二长花岗岩时,萤石及围岩与华南黑云母的球粒陨石标准化稀土元素配分曲线一致,表明萤石中的稀土元素可能主要来源于被破坏了的黑云母,说明这类萤石成矿物质主要来源于地下热水流体对围岩的淋滤和萃取。结合研究区北部林西地区萤石矿床H-O、S同位素研究成果,认为喀喇沁旗地区萤石矿属于有大气降水参与的热液脉状充填型成因类型。
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| 关 键 词： | 萤石矿 地质特征 成因 大气降水 喀喇沁旗地区 |
| 收稿时间： | 2019-06-28 |
Geological characteristics and genesis analysis of fluorite deposits in Harqin Banner area of Inner Mongolia |
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| Authors: | ZHANG Chengxin SHANG Pengqiang JIAO Sen WEI Longfei ZHAO Han JIANG Zhenning CAO Guangyuan DAI Xiaoguang WANG Yanchao |
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| Institution: | 1. Geology Institute of China Chemical Geology and Mine Bureau, Beijing 100101, China;2. China Chemical Geology and Mine Bureau, Beijing 100013, China |
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| Abstract: | In order to further clarify the genesis of the fluorite deposit in Harqin Banner of Inner Mongolia, and to provide theoretical guidance for the exploration of regional fluorite deposits, the authors discussed the genesis and metallogenic source of fluorite deposits by analyzing the geochemical characters of trace and rare earth elements of fluorite ores and surrounding rocks in typical fluorite deposits, on the basis of systematically summing up the geological characteristics and distribution regulars of fluorite deposits. The content of Cu, Pb and Zn in fluorite is relatively low, and the light rare earth elements(LREEs) are slightly-enriched, with relatively low content of rare earth elements(REEs). It indicates that the fluorite ore-forming fluid in this area is less likely to be of post-magmatic hydrothermal origin. The chondrite-normalized REE distribution patterns of fluorite ores and ore-bearing surrounding rock are similar and synchronous. When the surrounding rock is biotite-monzonitic granite, the REE distribution curves of fluorite and surrounding rock ore in good agreement with these of biotite in South China, indicating that the REEs in fluorite may mainly come from the destroyed biotite. It indicates that this kind of fluorite ore-forming material mainly comes from leaching and extraction of surrounding rock by geothermal water fluid. Combining with the research results of H-O and S isotopes of fluorite deposits in Linxi area in the northern part of the study area, the authors think that the genetic type of fluorite deposits in Harqin Banner area is a hydrothermal vein filling type with atmospheric rainfall. |
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| Keywords: | fluorite ore geological characteristics genesis atmospheric rainfall Harqin Banner area |
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