滇西保山地块金厂河Fe-Cu-Pb-Zn多金属矿床黑柱石成因及地质意义
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1.昆明理工大学国土资源工程学院;2.云南黄金矿业集团股份有限公司

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国家自然科学基金项目(41862009)、云南黄金集团校企合作项目(KKF0202121297)、云南省基础研究计划项目(2019FB062、2019FA018)、云南省万人计划“青年拔尖人才”专项(20190028)联合资助的成果。


Genesis and Geological Significance of ilvaite in Jinchanghe Fe-Cu-Pb-Zn polymetallic deposit, Baoshan Block, Western Yunnan
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1.Kunming University of Science and Technology;2.Yunnan Gold Mining Group Co. Ltd

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    摘要:

    黑柱石是一种矽卡岩型Pb-Zn矿床、Fe矿床中常见的矿物,与铅锌矿体、磁铁矿体关系密切。为查明黑柱石成矿过程中与铅锌铁铜多金属成矿作用的关系,本文对金厂河Fe-Cu-Pb-Zn多金属矿床中的黑柱石产状、矿物共生组合、化学成分、分带性等开展了研究。根据电子探针数据计算可得,其化学式为:Ca0.95-1.08(Fe0.87-1.97Mn0.08-0.36Mg0.01-0.06)1.89-2.032+(Fe0.82-1.04Al0.01-0.03)0.88-1.153+[Si1.94-2.08O7]O(OH)。结合矿物组合类型、产状、分带特征等,推测矿床内矽卡岩由内带逐渐向外带交代的趋势。金厂河矿区主要有3种矿物共生组合:I、黑柱石+磁铁矿组合,II、黑柱石+磁铁矿+黄铁矿+黄铜矿组合,III、黑柱石+方铅矿+闪锌矿+黄铜矿组合,分别对应三个不同的蚀变阶段:晚期矽卡岩阶段(代表组合I),以石榴子石的分解为主,形成大量的黑柱石;退蚀变阶段(代表组合II),以阳起石、黄铜矿、黄铁矿发育为主;石英-硫化物阶段(代表组合III),黑柱石进一步的分解,形成石英、方解石、磁铁矿等。此外,黑柱石的稀土元素配分模式与石榴子石的十分相似,具有一定的继承性。研究认为:黑柱石是早期石榴子石退化分解的产物,矿床自内向外逐渐交代,形成了铅锌铜矿体中以锰质黑柱石为主、磁铁矿体中以含锰黑柱石为主的分带特性。锰质黑柱石有利于铅锌矿的形成,而对于磁铁矿有贫化的影响,同时也可为矿区揭露中酸性岩体和深部找矿提供重要科学意义。

    Abstract:

    Ilvaite is a common mineral in skarn-type Pb-Zn deposits and Fe deposits, and is closely related to lead-zinc ore bodies and magnetite ore bodies. In order to find out the relationship between the ore-forming process of ilvaite and Pb-Zn-Fe-Cu polymetallic mineralization, this paper investigated the production environment, mineral symbiotic assemblage, chemical chemistry of ilvaite in the Jinchanghe Fe-Cu-Pb-Zn polymetallic deposit. The composition and zonality were studied. Calculated according to the EMPA data, its chemical formula is: Ca0.95-1.08(Fe0.87-1.97Mn0.08-0.36Mg0.01-0.06)1.89-2.032+(Fe0.82-1.04Al0.01-0.03)0.88-1.153+(Si1.94-2.08O7)O(OH). Combined with the type of mineral assemblage, occurrence, zoning characteristics, etc., it was inferred that the skarn in the deposit will gradually metasomatize from the inner zone to the outer zone. There are mainly 3 mineral symbiotic combinations in Jinchanghe mining area: I、Ilvaite + magnetite combination, II、Ilvaite + magnetite + pyrite + chalcopyrite combination, III、Ilvaite + galena + sphalerite + chalcopyrite combination, corresponds to three different alteration stages: the later skarn stage (representative assemblage I), which is dominated by the decomposition of garnet, forming a large number of ilvaites; the retro-alteration stage(representative assemblage II), mainly actinolite, chalcopyrite, and pyrite developed; at the quartz-sulfide stage (representative assemblage III), ilvaite was further decomposed to form quartz, calcite, magnetite, etc. In addition, the distribution pattern of rare earth elements of ilvaite is very similar to that of garnet, which has certain inheritance. The research believes that the ilvaite is the product of the degradation and decomposition of the early garnet, and the ore deposit is gradually metasomatized from the inside to the outside, forming a Mn-rich ilvaite in the lead-zinc-copper ore body and manganese ilvaite in the magnetite ore body banding feature. Mn-rich ilvaite is conducive to the formation of lead-zinc ore, and has an influence on the depletion of magnetite. Meanwhile, it can also provide important scientific significance for the mining area to expose the neutral acid rock and deep prospecting.

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  • 收稿日期:2022-08-06
  • 最后修改日期:2022-09-24
  • 录用日期:2022-10-27
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