| 西天山呼斯特岩体矿物化学特征及其成岩成矿意义 |
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| 引用本文： | 何宇,章永梅,顾雪祥,彭义伟,程文斌,王冠南,万阈,袁鹏.西天山呼斯特岩体矿物化学特征及其成岩成矿意义[J].现代地质,2018,32(6):1227. |
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| 作者姓名： | 何宇 章永梅 顾雪祥 彭义伟 程文斌 王冠南 万阈 袁鹏 |
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| 作者单位： | (1中国地质大学(北京) 地球科学与资源学院，北京100083；2中国地质大学 地质过程与矿产资源国家重点实验室，北京100083；
3成都理工大学 地球科学学院，四川 成都610059；4新疆地矿局第七地质大队，新疆 乌苏833300) |
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| 基金项目： | 国家自然科学基金项目（41572062）；科技部深地资源勘查开采专项(2018YFC0604003)；中央返还两权价款资金综合研究项目（Y15 1 LQ04，Y15 1 LQ02）；中央高校基本科研业务费专项资金资助项目（2652017226）。 |
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| 摘 要： | 呼斯特岩体位于新疆西天山博罗科努岛弧带中北缘，是博罗科努成矿带东段典型的与矽卡岩矿床成矿有关的中酸性杂岩体。对岩体中的二长花岗岩、花岗闪长岩和暗色包体进行了系统的矿物化学研究，探讨了岩浆的成岩演化过程以及矿物成分与成岩成矿的关系。造岩矿物的化学成分研究表明，呼斯特岩体为典型的I型花岗岩，形成于与俯冲有关的大陆边缘弧环境，成岩物质来自壳幔混源，成岩过程中经历了岩浆混合作用。岩体形成于较高温度(738~770 ℃)、较低压力(057~142 kbar，1 kbar=01 GPa)和高氧逸度环境。二长花岗岩和花岗闪长岩的侵位深度(22~42 km)和高氧逸度有利于可克萨拉—艾木斯呆依铁铜矿床的形成。岩石中的黑云母相对富镁且氧化系数较高，角闪石富镁、富硅且化学成分变化较大，二者均表现出与铁铜矿化有关的成分特征。岩浆混合作用与矿床的形成关系密切，对区内斑岩-矽卡岩型多金属矿床的找矿具有指示意义。
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| 关 键 词： | 矿物化学 成岩作用 成矿意义 呼斯特岩体 新疆西天山 |
Mineral Chemistry of Husite Pluton in West Tianshan,Xinjiang and Its
Implications for Petrogenesis and Mineralization |
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| HE Yu,ZHANG Yongmei,GU Xuexiang,PENG Yiwei,CHENG Wenbin,WANG Guannan,WAN Yu,YUAN Peng.Mineral Chemistry of Husite Pluton in West Tianshan,Xinjiang and Its
Implications for Petrogenesis and Mineralization[J].Geoscience——Journal of Graduate School,China University of Geosciences,2018,32(6):1227. |
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| Authors: | HE Yu ZHANG Yongmei GU Xuexiang PENG Yiwei CHENG Wenbin WANG Guannan WAN Yu YUAN Peng |
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| Institution: | (1School of Earth Sciences and Resources, China University of Geosciences, Beijing100083, China；
2State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing100083, China；
3College of Earth Sciences, Chengdu University of Technology, Chengdu,Sichuan610059, China；
4No7 Geological Team, Xinjiang Bureau of Geology and Mineral Resources, Usu,Xinjiang833000, China) |
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| Abstract: | The Husite pluton is situated on the middle northern margin of the Boluokenu island arc in the West Tianshan, Xinjiang, and is a typical skarn mineralization related intermediate felsic intrusive complex in the eastern Boluokenu ore belt. In this paper, we systematically studied the mineral chemistry of monzogranite, granodiorite and mafic enclaves from the Husite pluton, and discussed the magmatic evolution and the relationship between mineral composition and petrogenesis and metallogenesis. Rock forming mineral compositions show that the Husite granites are typically I type formed in a continental arc setting, and was mainly derived from partial melting of the lower crust with mantle derived input. The Husite pluton was formed under relatively high temperature (738-770 ℃), low pressure (057-142 kbar) and oxidizing environment. The shallow emplacement (22-42 km deep) of oxidized monzogranitic and granodioritic magmas likely facilitated the Kekesala Aimusidaiyi Fe Cu ore formation. The Mg enrichment and high oxidation coefficient of biotite, and the Mg Si enrichment and wide compositional range of amphibole in these rocks are both compositional features related to Fe Cu mineralization. Magma mixing may have been closely related to the ore formation, and is also indicative for porphyry skarn polymetallic prospecting in the region. |
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| Keywords: | mineral chemistry petrogenesis mineralization significance Husite pluton West Tianshan Xinjiang |
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