峨眉火成岩省内带岩浆硫化物含矿岩体橄榄石的成因意义
Genetic Significances of Olivine from Magmatic Sulfide Ore-Bearing Intrusions in Central Zone of Emeishan Large Igneous Province
查看参考文献50篇
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文摘
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峨眉火成岩省内带出露数十个含Ni-Cu-铂族元素(PGE)硫化物矿床(或矿化)的镁铁质-超镁铁质侵入岩体.根据铂族元素(PGE)含量的不同,这些岩浆硫化物矿床可分为Ni-Cu型(如力马河和清水河)、Ni-Cu-PGE型(如清矿山和黄草坪)和 PGE型(如金宝山和杨合武).不同类型含矿岩体的橄榄石电子探针分析表明,除了清矿山岩体少数几个橄榄石晶体属于镁橄榄石外(Fo90.1~Fo93.1),其余均为贵橄榄石(Fo76.8~Fo89.6).不同矿化类型的岩体的橄榄石成分差异明显.Ni-Cu型硫化物含矿岩体的橄榄石Fo为77~87, Ni含量变化范围为(976~2 176)×10~6.Ni-Cu-PGE型硫化物含矿岩体的橄榄石Fo为80~ 86, Ni含量范围为(1 024~2 543)×10~6.PGE型硫化物含矿岩体的橄榄石Fo为78~84, Ni含量在(776~1 755 )×10~6之间变化.清矿山Ni-Cu-PGE型硫化物含矿岩体橄榄石具有高Fo(最高达93.1)和CaO含量(0.245%~1.14%)、以及非常低的 Ni(266×10~6)的特征,可能是同化混染作用的结果.利用力马河岩体最高Fo含量的橄榄石成分计算表明,母岩浆是高镁苦橄玄武质岩浆.橄榄石分离结晶和硫化物熔离模拟显示:Ni-Cu型矿化侵入体母岩浆经历了最广泛的硫化物熔离(~0.1%), Ni-Cu-PGE型侵入体次之,大约为0.06%,而PGE型侵入体母岩浆硫化物熔离程度最低(~0.02%).早期结晶的橄榄石晶体与间隙硅酸盐熔浆之间再平衡过程是橄榄石成分变化的原因. |
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其他语种文摘
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Several mafic-ultramafic intrusions hosting economic Ni-Cu-(PGE) sulfide deposits and sub-economic sulfide mineralization occur in the central zone of the Emeishan large igneous province (LIP). These magmatic sulfide deposits can be divided into the Ni-Cu type (e.g. Limahe and Qingshuihe), Ni-Cu-PGE type (e.g. Qingkuangshan and Huangcaoping) and PGE type (e.g. Jinbaoshan and Yanghewu), according to the variations in the content of platinum-group elements (PGE). Electron microprobe analyses of olivine show that almost all olivine crystals are chrysolite (Fo76.8-Fo89.6), with an exception of some grains from the Qingkuangshan intrusion which are forsterite (Fo90.1-Fo93.1). The compositions of olivine are distinct between intrusions containing different types of sulfides. For the Ni-Cu sulfide-bearing intrusions, the Fo and Ni contents of olivine range from 77 to 87 and from 976×10-6to 2 176×10~6, respectively. Olivine crystals in the Ni-Cu-PGE sulfide-bearing intrusions have Fo numbers varying from 80 to 86 and (1 024-2 543)×10~6Ni. The PGE sulfide-bearing intrusions contain olivine crystals with Fo numbers ranging from 78 to 84 and Ni contents of 776×10~6to 1 755×10~6. The olivine from the Qingkuangshan intrusion, which contains economic Ni-Cu-PGE sulfides, is distinct from others by its high Fo numbers (up to 93.1) and CaO content (0.24%-1.14%) and extremely low Ni (266×10~6). The Ni concentrations and Mg#of parental magma have been estimated by using the compositions of most Fo-rich olivine crystals and the results show a high-MgO picritic-basaltic magma. Modeling of olivine fractional crystallization and sulfide segregation show that the parental magma for the Ni-Cu type mineralized intrusions has experienced the most extensive sulfide segregation (~0.1%). For the Ni-Cu-PGE type intrusions, it is ~0.06%, and for the PGE type intrusions it is ~0.02%. Re-equilibration of the early formed olivine crystals with the trapped liquid can account for the variations of olivine compositions. |
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来源
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地球科学
,2010,35(2):224-234 【核心库】
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DOI
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10.3799/dqkx.2010.022
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关键词
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峨眉火成岩省内带
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岩浆硫化物矿床
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橄榄石
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分离结晶
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硫化物熔离
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晶间熔浆效应
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地址
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1.
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, 贵州, 贵阳, 550002
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School of Earth Sciences and Centre for Ore Deposit Research, University of Tasmania, Australia, Hobart TAS, 7001
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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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1000-2383 |
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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973计划
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中国科学院“百人计划”项目
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国家自然科学基金
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文献收藏号
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CSCD:3895625
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