云南九顶山斑岩-矽卡岩型铜钼矿床成矿机制研究
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P618.41;P618.65

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国家重点研发计划资助项目(2017YFC0601302)


Study on the metallogenic mechanisms of Jiudingshan porphyry-skarn Cu-Mo deposit
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    摘要:

    九顶山斑岩-矽卡岩型铜钼矿位于"三江"-特提斯成矿域,与印度和欧亚板块晚碰撞环境下的金沙江-哀牢山左行走滑断层相关。矿区呈现岩体斑岩系统Mo-Cu矿化,接触带矽卡岩系统Cu-Mo矿化及远端围岩弱Pb-Zn矿化的分带特征。含矿二长花岗斑岩和似斑状花岗岩锆石Ce4+/Ce3+值分别为218.0和218.6,显示了高氧逸度的含矿岩浆条件。矽卡岩中石榴石为钙铁榴石-钙铝榴石系列,核部贫Al富Fe,边部Al含量逐渐升高,局部可见富Fe环带。石榴石核部富集Mo、W、LREE,边部贫LREE,富Cu、Eu、U。矿石成矿元素分析表明Cu-Ag-W的富集范围高度一致、Mo与Cu无显著相关性。高氧逸度条件有利于硫不饱和岩浆富集携带Cu、Mo;矽卡岩成矿系统早期继承了高温高氧逸度岩浆流体,后期氧逸度降低,经历了流体沸腾作用,Mo溶解程度降低。上述演化过程导致九顶山斑岩系统富集Mo、矽卡岩系统富集Cu。

    Abstract:

    The Jiudingshan porphyry-skarn Cu-Mo deposit, located in the Sanjiang-Tethys metallogenic domain, is related to the left trending strike-slip fault of Jinshajiang-Ailaoshan tectonic belt. Field observations have identified the metal zonation in Jiudingshan, including the Mo-Cu mineralization in the inner porphyry system, Cu-Mo mineralization in the skarn system from the intrusion-carbonate contact zone, and the weakly Pb-Zn mineralization in the distal wall rocks. Trace element analyses on zircons from ore-bearing monzogranitic porphyry and porphyritic-like granite have yielded an average Ce4+/Ce3+ ratios of 218.0 and 218.6, respectively, which demonstrates an oxidative condition. Hydrothermal garnets from skarn system are well zoned and exhibit a large variation in Al and Fe contents. The dark cores of garnet are belong to andradite and enriched in LREEs, Mo and W, whereas the bright rims share an increase in Al and are enriched in Eu, U and Cu. Further Cu-Ag-Pb-Zn-Mo-W-Bi-Sn-As-Sb-Ti analyses on mineralized intrusions and orebodies have indicated a similar zonation observed in the field. The metals, like Cu, Ag and W, are commonly enriched in the same pattern while Mo shares no relationship with Cu. It can be concluded that an sulfur-unsaturated magma was more easily enriched and brought the Cu and Mo under high oxygen fugacity condition. The transition of Fe-rich to Al-enriched endmember in garnet from skarn system has suggested a fluid boiling process under a less oxidative condition. This process would inhibit the transportation of Mo complexes into skarn system but has the negligible impact on the solution of Cu, which finally led to the high Mo/Cu orebodies in porphyry system and high Cu/Mo orebodies in skarn system.

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范佳,郭虎,赖勇,吕鑫,2021,云南九顶山斑岩-矽卡岩型铜钼矿床成矿机制研究[J].岩石矿物学杂志,40(6):1049~1073.

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  • 收稿日期:2021-03-23
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  • 在线发布日期: 2021-11-15
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