南岭中段黄沙铀矿区黑云母与绿泥石的矿物化学特征及其对成岩成矿的约束

发布时间：2018-03-12 09:18

本文选题：铀成矿　切入点：黑云母　出处：《高校地质学报》2017年04期 　论文类型：期刊论文

【摘要】：黄沙铀矿区位于南岭成矿带中段龙源坝岩体中南部,区内成矿地质条件优越,铀资源找矿潜力大。本文在矿物原位分析技术(EPMA与LA-ICP-MS)的基础上,讨论了黑云母和绿泥石的矿物化学特征对成岩成矿作用过程的约束。结果显示,矿区印支期中粗粒黑云母花岗岩中黑云母为铁质黑云母,指示岩浆演化程度较高,氧逸度和结晶温度较高。黑云母是花岗质熔体中Rb、Ba、Nb、Ta、Sc、V、Co、Ni、Cr元素的主要载体,副矿物(独居石、锆石、磷钇矿等)是Th、Sr、Hf、Zr、Y的主要载体,U主要赋存于晶质铀矿和含铀副矿物中。绿泥石分黑云母假象绿泥石和脉状绿泥石两类,形成于中温、相对酸性、相对氧化性的环境下。黑云母假象绿泥石形成于成矿前期的面状蚀变,以相对富铁为特征,经历了溶解、沉淀过程,伴随晶质铀矿和含铀副矿物中铀的活化与再分配。脉状绿泥石形成于成矿期的热液蚀变,以相对富镁为特征,经历了溶解、迁移与沉淀过程,富U流体流经还原性介质时,流体中的U~(6+)被还原沉淀形成沥青铀矿。
[Abstract]:The Huangsha uranium ore area is located in the central and southern part of Longyuanba rock body in the middle section of the Nanling metallogenic belt. The ore-forming geological conditions in the area are superior and the prospecting potential of uranium resources is great. This paper is based on the in situ mineral analysis techniques such as EPMA and LA-ICP-MS. The constraints of mineralogical characteristics of biotite and chlorite on the process of diagenesis are discussed. The results show that the biotite in the coarse biotite granite of the Indosinian period is ferric biotite, indicating that the magma evolves to a higher degree. Biotite is the main carrier of the elements of RbbbBaNbCU TaNbCU / CoCoNiONK in granitic melts, and the secondary minerals (monazite, zircon, zircon, zircon, etc.) are the main carriers of the elements of the elements, such as monazite, zircon, zircon, etc. Yttrium phosphate) is the main carrier of Thsrsrsrhfhfzru Y, which mainly exists in uraniferous uranium deposits and uranium-bearing accessory minerals. Chlorite is divided into two types: biotite pseudo-chlorite and vein-like chlorite, which are formed at moderate temperature and relatively acidic. In a relatively oxidizing environment, biotite pseudo chlorite formed in the early metallogenic stage of surface alteration, characterized by relatively rich iron, experienced dissolution and precipitation process, Along with the activation and redistribution of uranium in crystalline uranium deposits and uranium-bearing accessory minerals, vein-like chlorite formed during the metallogenic period is characterized by hydrothermal alteration, characterized by relatively rich magnesium, during dissolution, migration and precipitation, and when U-rich fluids flow through reductive media. In the fluid, UHU 6) is reduced and precipitated to form asphaltene uranium deposit.
【作者单位】：东华理工大学核资源与环境国家重点实验室培养基地;核工业290研究所;
【基金】：国家自然基金项目(U1403292) 中国地质调查局项目(12120115035601) 省部共建核资源与环境国家重点实验室培育基地自主基金项目(Z1608) 江西省研究生创新项目(YC2016-B074)联合资助
【分类号】：P619.14

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