罗卜岭斑岩Cu-Mo矿床成矿流体演化:来自石英阴极发光及LA-ICP-MS微量元素的制约
The evolution of ore-forming fluids of the Luoboling porphyry Cu-Mo deposit:Constraints from cathode luminescence images and LA-ICP-MS trace element analyses of quartzs
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文摘
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罗卜岭大型斑岩Cu-Mo矿床具有166万吨的Cu储量和12万吨的Mo储量,是紫金山Cu-Au-Mo-Ag矿集区内斑岩型矿床的典型代表。矿床成矿过程可划分为成矿前、Mo成矿期、Cu-Mo成矿期和成矿后4个阶段。成矿前和Mo成矿期以发育粗粒亮色(阴极发光,CL)石英为特征,CL图像发光强度均一,Cu-Mo成矿期以发育中-细粒不均一灰色石英为特征,成矿后期则以发育生长环带的暗灰色石英为特征。各阶段石英w(Ti)介于<0.1×10~(-6)~144×10~(-6)之间,与石英CL发光强度呈正相关,总体上由成矿前至成矿后呈现逐渐降低的趋势,暗示流体逐渐降温的过程。Ti温度计计算结果表明,不同期石英结晶温度主体介于189~640 ℃。石英中w(Al)介于32×10~(-6)~3855×10~(-6)之间,在成矿前、主成矿期脉体及成矿后石英-黄铁矿脉中均较稳定(32×10~(-6)~373 ×10~(-6))或局部降低,仅在最晚期含石膏、方解石脉中明显升高。Al含量的变化暗示水岩反应(绢英岩化)消耗了初始流体中的H~+,导致反应后流体pH值相对稳定或局部升高,该过程可能对黄铜矿的饱和沉淀起到了促进作用。除浅部晚阶段石英-黄铁矿脉,石英中Al与Li的行为保持一致,表明Al~(3+)+Li~+在类质同象过程中替换Si~(4+)的现象普遍存在。 |
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其他语种文摘
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The Luoboling large Cu-Mo deposit,with metal resources of 1.66 million tons of Cu and 0.12 million tons of Mo,is a typical representative porphyry deposit in the Zijinshan Cu-Au-Mo-Ag ore concentrated district.Four stages of the hydrothermal mineralization process,including pre-mineralization,Mo-mineralization,Cu-Mo-mineralization,and post-mineralization stages,of the Luoboling deposit have been identified.The quartzs of pre-mineralization and Mo-mineralization stages are characterized by coarse-grained ones with homogeneous bright cathodeluminescence (CL) images,the quartzs of Cu-Mo mineralization stage are characterized by medium to fine-grained ones with inhomogeneous grey CL images,whereas the quartzs of post-mineralization stage are characterized by dark grey CL images of quartzs with growth zones.The Ti contents of quartzs in different stages,ranging from <0.1×10~(-6) to 144×10~(-6),are positively correlated with the CL intensities of quartzs.They are generally decreased from the pre-mineralization to post-mineralization stages,suggesting the gradual cooling process of the evolved ore-forming fluids.Based on the calculation of Ti-in-quartz thermometer,the crystallization temperatures of quartzs of different stages at Luoboling vary mainly from 189℃ to ~ 640℃.The Al concentrations in quartzs vary from 32×10~(-6) to 3855×10~(-6).Especially,quartzs of veins in pre-mineralization,Mo-mineralization,and Cu-Mo-mineralization stages and of quartz-pyrite veins in post-mineralization stage contain Al contents mainly varying from 32×10~(-6) to 373×10~(-6),ore limitedly lower than 32×10~(-6),only the quartzs in gypsum- and calcite-bearing quartz veins of the post-mineralization stage have Al contents obviously higher than373×10~(-6).The variation of Al concentrations in quartzs indicates that the consumption of H~+ in the original fluids by the water-rock interaction (phyllic alteration) resulted in the relative stabilization or the local increase of pH values of the fluids,then could promote the saturation and precipitation of chalcopyrite.Except the shallow-level quartz-pyrite veins in post-mineralization stage,the Al and Li in quartzs have similar geochemical behaviors at Luoboling,revealing that the substitution of Si~(4+) by coupled Al~(3+) and Li~+ in quartz lattice is common in isomorphism. |
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来源
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矿物学报
,2022,42(5):579-589 【核心库】
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DOI
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10.16461/j.cnki.1000-4734.2022.42.057
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关键词
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Cu-Mo矿床
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石英
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阴极发光
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微量元素
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LA-ICP-MS
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成矿流体
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罗卜岭斑岩
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地址
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1.
昆明理工大学国土资源工程学院, 云南, 昆明, 650093
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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, 贵州, 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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1000-4734 |
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学科
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地质学 |
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基金
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国家自然科学基金项目
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云南省基础研究专项项目
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昆明理工大学人培基金项目
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国家重点研发计划项目
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文献收藏号
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CSCD:7267030
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