| 新疆包古图地区斑岩型铜矿化特征和成矿元素迁移规律初探 |
| Received:January 30, 2013 Revised:October 30, 2013 点此下载全文 |
| 引用本文：WEI ShaoNi,ZHU YongFeng,AN Fang.2014.Mineralization and elements migration characteristics of porphyry copper deposits in Baogutu area, Xinjiang[J].Mineral Deposits,33(1):165~180 |
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| Author Name | Affiliation | | WEI ShaoNi | Xinjiang Key Laboratory for Geodynamic Processes and Metallogenic Prognosis of the Central Asian Orogenic Belt, College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, Shaanxi, China
School of Earth and Space Science, Peking University, Beijing 100871, China | | ZHU YongFeng | School of Earth and Space Science, Peking University, Beijing 100871, China | | AN Fang | State Key Laboratory for Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China |
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| 基金项目:本文得到国家自然科学基金项目（41203032）和国际科技合作项目（2010DFB23390）联合资助 |
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| 中文摘要:新疆西准噶尔包古图地区斑岩型铜矿化发育，蚀变矿化特征随岩体不同存在显著差异。文章通过岩石学、矿相学和微量元素地球化学的方法，重点研究了Ⅲ号和Ⅴ号岩体的矿化特征和成矿元素迁移规律。结果表明：Ⅲ号岩体矿化中等，以黄铁矿、磁黄铁矿和黄铜矿为主，呈浸染状，硫化物脉少见；Ⅴ号岩体内部及其与围岩接触带产出大型铜矿床，金属矿物主要有黄铁矿、黄铜矿和辉钼矿，呈浸染状和细脉-网脉状分布。Ⅲ号岩体角闪石英闪长岩形成于岩浆-热液过渡阶段，与石英（花岗）闪长岩对比显示，挥发分出溶过程中，Cs、Rb、Ba、Th、U迁移进入挥发相，稀土元素稳定未迁移，Cu、Bi显著富集，Mo和Sb被流体迁移带走，形成热液矿化。Ⅴ号岩体钾化和硅化样品代表了不同的流体作用阶段，与未蚀变样品对比显示，在钾化阶段Nb、Ta、Zr、Hf性质稳定，轻稀土元素发生显著迁移，在硅化阶段轻稀土元素富集；重稀土元素在岩浆-热液演化过程保持稳定。Cu、Mo和Bi在钾化作用阶段富集成矿，Zn和Sb则主要在晚期石英脉中富集。 |
| 中文关键词:地质学 元素迁移 热液蚀变 斑岩铜矿 包古图 新疆 |
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| Mineralization and elements migration characteristics of porphyry copper deposits in Baogutu area, Xinjiang |
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| Abstract:Porphyry copper deposits are well developed in Baogutu area, west Junggar, Xinjiang. Different intrusions show remarkable difference in alteration and mineralization features. The authors studied emphatically the mineralization and ore-forming elements migration in intrusive body Ⅲ and Ⅴ by means of petrology, ore microscopy and trace element geochemistry. Intrusion Ⅲ has experienced a medium degree of mineralization, with plenty of disseminated pyrite, pyrrhotite and chalcopyrite and minor sulfide veins. Intrusion Ⅴ has large-size porphyry copper deposits within the rock body or along its contact zone with wall rocks, containing plenty of chalcopyrite, pyrite and molybdenite,with disseminated and veinlet structure. Amphibole-quartz diorite from intrusion Ⅲ crystallized in the transition process from magma to hydrothermal solution, during which Cs, Rb, Ba, Th and U migrated into volatiles, REE was immobile, Cu and Bi were obviously concentrated, and Mo and Sb moved away with the fluid, producing hydrothermal mineralization. A comparative study of potassic altered samples, silicified samples and fresh samples from intrusion Ⅴ indicates that Nb, Ta, Zr, Hf remained immobile during the potassic alteration while LREE moved until silicification. HREE remained stable during the whole magmatic-hydrothermal process. Cu, Mo and Bi precipitated during potassic alteration, whereas Zn and Sb were concentrated in the late stage quartz veins. |
| keywords:geology elements migration hydrothermal alteration porphyry copper deposit Baogutu Xinjiang |
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