内蒙古白音查干锡多金属矿床成矿作用研究Ⅰ:金属矿物组合及其成因机制

刘新; 王京彬; 祝新友; 孙雅琳; 蒋昊原; 蒋斌斌; 王海; 程细音

文章摘要

刘新,王京彬,祝新友,孙雅琳,蒋昊原,蒋斌斌,王海,程细音.内蒙古白音查干锡多金属矿床成矿作用研究Ⅰ:金属矿物组合及其成因机制[J].矿产勘查,2017,8(6):967-980

内蒙古白音查干锡多金属矿床成矿作用研究Ⅰ:金属矿物组合及其成因机制

Mineralization process of the Baiyinchagan tin polymetallic depositin Inner MongoliaⅠ:Metallic mineral assemblage and metallogenic mechanism

投稿时间：2017-09-13

DOI：

中文关键词: 白音查干锡多金属矿床大兴安岭南段金属矿物组合成因机制

英文关键词: tin polymetallic deposit, metallic mineral assemblage, metallogenic mechanism, Baiyinchagan, southern section of the Da Hinggan Mountains

基金项目:中国地质调查局国家二级项目内蒙古赤峰有色金属基地综合地质调查(编号:DD20160072)及博士后科学基金项目(编号:2016M600930)联合资助。

作者	单位
刘新	北京矿产地质研究院,北京 100012 中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳 550002
王京彬	北京矿产地质研究院,北京 100012
祝新友	北京矿产地质研究院,北京 100012
孙雅琳	北京矿产地质研究院,北京 100012 中国地质大学北京,北京 100083
蒋昊原	北京矿产地质研究院,北京 100012 中国地质大学北京,北京 100083
蒋斌斌	北京矿产地质研究院,北京 100012
王海	北京矿产地质研究院,北京 100012 昆明理工大学国土资源工程学院,昆明 650093
程细音	北京矿产地质研究院,北京 100012

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中文摘要:

白音查干具有岩浆岩自蚀变阶段(Ⅰ)、隐爆角砾岩阶段(Ⅱ)、锡石硫化物阶段(Ⅲ)、锑矿化阶段(Ⅳ)4个成矿阶段,其中Ⅲ为主成矿阶段。闪锌矿为贯通型矿物,成分随成矿温度、压力改变发生系统性变化。Ag主要以银黝铜矿存在,少量Ag进入黄铜矿、方铅矿晶格形成类质同象银,晚阶段可能存在含银Pb-Sb(Bi)硫盐类矿物。成矿早阶段体系温度和氧逸度较高,Sn⁴⁺和Zn²⁺、Cu²⁺、Pb²⁺、Ag⁺等分别以SnO2-₃和氟络合物形式迁移。隐爆作用发生后,体系压力降低、pH值升高,金属元素以HS-络合物形式迁移。成矿流体与大气降水混合后,还原性增强,HS-络合物分解,黄铁矿、毒砂、黄铜矿、闪锌矿、方铅矿、辉锑矿、白铁矿依次沉淀。此后体系中阴离子以SbS2-₃为主,形成黝铜矿族矿物、车轮矿、脆硫锑铅矿等。

英文摘要:

The mineralization of Baiyinchagan tin polymetallic deposit has been divided into four mineralization stages, i.e., magmatic stage, cryptoexplosion breccias stage, cassiterite-sulfide stage, which is the major mineralization stage, and antimony mineralization stage. Sphalerite occurs in all of these stages, and its Fe content systemically changes with P and T. Sliver-bearing minerals mainly consist of freibergite and lattice silver, which were formed by isomorphic replacement of Ag with Cu and Pb. At the early high temperature oxidizing environment, Sn is transported as SnO2-₃, while Zn²⁺,Cu²⁺,Pb²⁺ and Ag⁺ are transported as fluorine complexes. When the crypto explosion took place, the formation of HS- complex and another precipitation of metal minerals were resulted from the release of pressure and leak of CO₂ accompanied with increasing pH. At the later mineralization stage, due to mixture of magmatic water with ore-forming fluid, the mineral of pyrite, arsenopyrite, chalcopyrite, sphalerite, galena, stibnite and marcasite was sequentially formed after the decrease of temperature , increase of reducibility and breaking down of HS-1 complex. At last, SbS2-₃ is the main anion in the meteoric water, and the tetrahedrite group minerals, such as bournonite and jamesonite were formed in quick succession.

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