| 李昌昊,黄玮,龙灵利,申萍.新疆西准噶尔地区石屋 Cu-Au矿床电气石特征及其对成矿过程的指示意义[J].矿产勘查,2025,16(5):990-1005 |
| 新疆西准噶尔地区石屋 Cu-Au矿床电气石特征及其对成矿过程的指示意义 |
| Characteristics of tourmaline from the Shiwu Cu-Au deposit in the West Junggar Region, Xinjiang, China: Implications for the mineralization process |
| 投稿时间：2025-03-10 |
| DOI：10.20008/j.kckc.202505005 |
| 中文关键词: 电气石 成矿过程 石屋 Cu-Au矿床 新疆西准噶尔 中亚成矿域 |
| 英文关键词: tourmaline mineralization process Shiwu Cu-Au deposit West Junggar region Central Asian Metallogenic Domain |
| 基金项目:本文受新疆维吾尔自治区重点研发任务专项“新疆重要成矿带铜镍铬钴战略性矿产成矿预测与潜力评价关键技术研究”(2023B03006)、新疆维吾尔自治区“天池英才”引进计划和国家科技重大专项“冈底斯中段斑岩铜多金属矿成矿规律与找矿勘查模型”(2024ZD1003201)联合资助。 |
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| 中文摘要: |
| 北巴尔喀什—西准噶尔成矿带是中亚成矿域的重要组成部分。石屋 Cu-Au矿床位于新疆西准噶尔巴尔鲁克地区，是近年来新发现的斑岩型 Cu-Au矿床。本研究通过矿床内电气石的结构和成分分析，探讨了电气石的成因和矿床的成矿过程。石屋矿床中的电气石可分为与 Cu矿化相关的电气石(Tur I)和与 Cu矿化无关的电气石(浸染状，Tur II；角砾岩中的胶结物，Tur Ⅲ)。不同类型电气石均属于碱性电气石中的黑电气石-镁电气石固溶体系列，引起电气石成分变化的机制为 FeMg-1、Fe2+Fe3+(Mg，Al)-1和 X□，Al(Na， R2+)-1替换。Tur I相比于另外两类电气石具有高 FeO含量(平均值分别为12，.36%~18.55%和 10.34%~13.87%)和 Fe/(Fe+Mg)比值(平均值分别为 0.57~0.65和 0.45~0.56)以及低 MgO含量(平均值分别为 4.80%~5.49%和6.08%~6.97%)特征，并且分类上仅为黑电气石。本研究表明，成矿流体和围岩之间的水岩反应是导致石屋矿床中电气石成分变化的主要原因，但水岩反应对于矿床内 Cu元素的沉淀仅起到次要作用。矿区内电气石的成分特征对于判断矿化类型具有指示意义，而 Fe/(Fe+Mg)比值的变化则可以辅助判断电气石的形成期次。 |
| 英文摘要: |
| The North Balkhash-West Junggar metallogenic belt is an important section of the Central AsianMetallogenic Domain. The Shiwu Cu-Au deposit is located in the Barleik region, West Junggar, Xinjiang, and is anewly identified porphyry Cu-Au deposit. In this work, through the textural and compositional study of tourmalinefrom the deposit, we discussed the tourmaline genesis and the mineralization process of the deposit. Tourmaline inthe Shiwu deposit can be classified into tourmaline related to Cu mineralization (Tur I) and tourmaline without Cumineralization (dissemination, Tur II; cements in breccia, Tur Ⅲ). The different types of tourmaline are classified inthe schorlite-dravite solid solution series of alkaline tourmalines, and the substitution mechanisms resulting in com.positional changes in tourmalines are FeMg-1, Fe2+, Fe3+(Mg, Al)-1, and X□, Al(Na, R2+)-1. Nevertheless, Tur I is char.acterized by high FeO concentrations (averages are 12.36%-18.55% and 10.34%-13.87%, respectively) and Fe/(Fe+Mg) ratios (averages are 0.57-0.65 and 0.45-0.56, respectively) as well as low MgO concentrations (averages are4.80%-5.49% and 6.08%-6.97%, respectively) compared to the other two types of tourmaline and are classified asschorlite. Based on this study, water-rock reactions between the mineralizing fluids and the host rock are the primaryfactor leading to compositional variations of tourmaline in the Shiwu deposit, but they play only a secondary role inthe Cu precipitation. The compositional characteristics of tourmaline in the deposit are an indicator for the mineral.ization type, while the variation of tourmaline Fe/(Fe+Mg) ratios can help to determine the phase of the tourmaline. |
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