攀西红格钒钛磁铁矿矿田富钴硫化物中钴的地球化学特征及其地质意义
Geochemical Characteristics and Geological Significance of Cobalt in Cobalt-Rich Sulfide of Hongge V-Ti Magnetite Ore Field,Panxi
查看参考文献38篇
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文摘
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攀西红格钒钛磁铁矿矿田白草矿区发育富钴硫化物矿物,关于其成因和形成环境方面的研究较为薄弱。本文采用矿物学、矿物化学、地球化学等方法对其进行系统研究。矿石中主要富钴硫化物为磁黄铁矿(Po)、黄铁矿(Py)、镍黄铁矿(Pn)、硫钴镍矿(Se)。磁黄铁矿Co、Ni平均质量分数分别为0.21%、 0.42%,Co/Ni平均值为1.10;黄铁矿Co、Ni平均质量分数分别为0.18%、0.29%,Co/Ni平均值为0.77;镍黄铁矿Co、Ni平均质量分数分别为2.67%、34.30%,Ni/Fe平均值为1.08、S/Fe平均值为1.91、M/S #平均值为1.13;硫钴镍矿Co、Ni平均质量分数分别为24.30%、22.90%,Co/Ni平均值为1.06。根据Po-Py矿物温度计,白草矿区富钴硫化物结晶温度在267~490℃之间,表明其形成于中高温的条件。通过与地幔包体镍黄铁矿S/Fe、M/S #特征值的对比,结合磁黄铁矿具有陨硫铁(Tr)同质多象晶体的特征,认为白草矿区硫化物具有地幔源的特征,说明成矿物质来源于地幔。白草矿区钴地球化学特征研究表明,在硫化物熔体分离过程中,钴迁移至单硫化物固溶体形成Po-Py固溶体,再由Po-Py固溶体中迁移至Pn、Se,形成了Se、Pn、Po-Py、Ccp(黄铜矿)中Co质量分数依次递减的现象。 |
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其他语种文摘
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Cobalt rich sulfide minerals are developed in Baicao mining area of Hongge ore field in Panxi.The research on their genesis and formation environment is relatively weak.In this paper,the mineralogy and mineral chemistry are used for a systematic study.The results show that the main cobalt-rich sulfides in the ore are pyrrhotite,pyrite,pentlandite,and siegenite.The average contents of Co and Ni in pyrrhotite are 0.21%and 0.42%respectively,and the average value of Co/Ni is 1.10;The average contents of Co and Ni in pyrite are 0.18%and 0.29%respectively,and the average value of Co/ Ni is 0.77;The average contents of Co and Ni in pentlandite are 2.67%and 34.30%respectively,and the average value of Ni/Fe,S/Fe and M/S#are 1.08,1.91and 1.13respectively;The average contents of Co and Ni in siegenite are 24.30% and 22.90% respectively,and the average value of Co/Ni is 1.06. According to the pyrrhotite-pyrite mineral thermometer,the crystallization temperature of the Baicao cobalt rich sulfide is about 267-490℃,which indicates that it was formed at medium high temperature. Compared with the characteristic values of S/Fe and M/S# of the mantle xenolith pentlandite,the pyrrhotite has the characteristics of troilite(Tr)homomorphic polycrystal,which reflects that the oreforming materials were derived from the mantle.The geochemical characteristics of cobalt in Baicao mining area show that in the process of sulfide melt separation,cobalt migrated to mono-sulfide solid solution to form Po-Py solid solution,and then migrated further to form Pn and Se solid solution, forming the phenomenon that the content of Co in Se,Pn,Po-Py and Ccp decreases gradually. |
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来源
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吉林大学学报. 地球科学版
,2021,51(6):1740-1752 【核心库】
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DOI
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10.13278/j.cnki.jjuese.20210027
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关键词
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富钴硫化物
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钴
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电子探针
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地球化学
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白草矿区
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红格钒钛磁铁矿矿田
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地址
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1.
长安大学地球科学与资源学院, 西安, 710065
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自然资源部岩浆作用成矿与找矿重点实验室, 自然资源部岩浆作用成矿与找矿重点实验室, 西安, 710065
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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, 550081
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1671-5888 |
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学科
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地质学 |
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基金
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国家自然科学基金
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中央高校基本科研业务费专项资金
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陕西省自然科学基金
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财通矿山新兴关键矿产资源综合研究项目
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文献收藏号
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CSCD:7097240
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