| 普朗斑岩铜矿岩浆混合作用：岩石学及元素地球化学证据 |
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| 引用本文： | 曹殿华,王安建,李文昌,王高尚,李瑞萍,李以科.普朗斑岩铜矿岩浆混合作用：岩石学及元素地球化学证据[J].地质学报,2009,83(2):166-175. |
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| 作者姓名： | 曹殿华 王安建 李文昌 王高尚 李瑞萍 李以科 |
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| 作者单位： | 1. 中国地质科学院矿产资源研究所,北京,100037
2. 云南省地质调查局,昆明,650051 |
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| 基金项目： | 国家科技攻关计划,国家重点基础研究发展计划（973计划） |
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| 摘 要： | 普朗斑岩铜矿花岗闪长斑岩中存在大量的随机分布的镁铁质微粒包体，包体与寄主岩存在渐变接触关系。包体成分为闪长质，具有岩浆结构，存在针状磷灰石，显示了快速冷却结晶的特征。包体内可见具有暗色矿物镶边的眼球状石英，表明存在岩浆混合作用。寄主岩岩体规模较小，呈岩枝状产出，包体和寄主岩均为似斑状结构，说明两种岩浆侵位和发生岩浆混合作用的深度较浅。元素地球化学特征显示包体与寄主岩的之间有成分交换。包体和寄主岩强不相容元素均富集，高场强元素Nb、Ta、Ti均表现出显著的负异常，具有典型的岛弧岩浆岩的微量元素特征，包体和寄主岩Mg＃较高，在同等Si条件下比玄武岩部分熔融体富K2O和MgO，意味着源区必须有幔源岩浆的贡献。普朗斑岩铜矿蚀变矿化模式反映了其成矿环境偏基性，暗示镁铁质岩浆的加入对成矿具有贡献。
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| 关 键 词： | 普朗 斑岩铜矿 镁铁质微粒包体 岩浆混合作用 |
Magma Mixing in Pulang Porphyry copper deposit: evidence from petrology and element geochemistry |
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| CAO Dianhua,WANG Anjian,LI Wenchang,WANG Gaoshang,LI Ruiping,LI Yike.Magma Mixing in Pulang Porphyry copper deposit: evidence from petrology and element geochemistry[J].Acta Geologica Sinica,2009,83(2):166-175. |
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| Authors: | CAO Dianhua WANG Anjian LI Wenchang WANG Gaoshang LI Ruiping LI Yike |
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| Institution: | Chinese Academy of Geological Sciences;-;-;-;-;- |
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| Abstract: | Plenty of mafic microgranular enclaves exist in granodiorite porphyrite of Pulang Porphyry copper deposit, and enclaves gradually contact with host rocks. The enclaves are diorite with magma texture, and exist speculate apatites, which show the quick crystallization of the magma. The occurrence of mafic-rimmed quartz ocelli indicate magma mixing. Transfer of elements between enclaves and host rock occurs. The enclaves and host rocks are enriched in LILEs and LREEs and depleted in HFSEs, and negative anomaly of Nb, Ta and Ti indicate that the both magma are from island arc setting. Higher values of Mg# and K than the experimental data for basalts show the contribution of material from mantle. The alteration zoning and mineralization characters of Pulang porphyry copper deposit are similar to porphyry copper-gold deposit type, which show the ore bearing rocks are more mafic than classic porphyry copper deposit type. The occurrence of magma mixing and mineralization features imply the contribution of mafic magma to the porphyry copper mineralization |
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| Keywords: | Pulang Porphyry copper deposit mafic microgranular enclaves Magma Mixing |
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