| 川西雅江木绒锂辉石矿床地质特征及控矿构造成因分析 |
| 投稿时间：2024-03-23 修订日期：2024-07-18 点此下载全文 |
| 引用本文：岳大斌.川西雅江木绒锂辉石矿床地质特征及控矿构造成因分析[J].地质与勘探,2025,61(1):64-73 |
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| 基金项目:自然资源部2024年新一轮找矿突破战略行动科技支撑项目（编号：ZKKJ202413）；四川省地质矿产勘查开发专项项目（编号：SCDZ-DZKC202403, SCDZ-KJXM202404）和四川省政府性投资地质勘查项目（编号：DZ202304）联合资助 |
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| 中文摘要:川西雅江木绒超大型花岗伟晶岩型锂辉石矿床为亚洲目前已知的最大单体锂辉石矿床。本文旨在研究木绒锂矿床的成矿地质背景、矿脉特征、控矿构造及矿物和元素的分带特征，为进一步的找矿工作提供理论依据。通过成矿地质背景分析、含矿伟晶岩脉特征研究和控矿构造分析，结合矿体中的矿物和元素分带特点，提出了变质相带和伟晶岩脉的类型特征。采用矿物组合的垂向和侧向分带特征分析，研究了矿床的成矿母岩作用及其控矿构造特征。研究发现，矿体的主要矿石类型为“钠长锂辉石”，变质相带呈现“石榴子石带-红柱石带-十字石带”的巴罗式变质相带，且具有狭长条带状的特点，属于热接触变质成因。矿脉从边缘到深部具有铌钽矿化到锂矿化的垂向分带特征，主矿脉的矿物组合展现了侧向分带的特点。木绒矿床的控矿构造呈现北东向构造，并具有先压后张的特征，与邻近甲基矿田的控矿特征显著不同。研究结果表明：木绒锂辉石矿床是一个单独的成矿中心，成矿母岩的作用距离表明在甲基卡-木绒一带具有多个成矿中心。矿床的成因、矿脉类型及控矿构造的差异为下一步找矿工作提供了重要依据。 |
| 中文关键词:垂向分带 侧向分带 控矿构造 锂辉石 木绒锂矿 雅江穹隆群 |
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| Geological characteristics and genesis of ore-controlling structures of the Murong spodumene deposit in Yajiang County of western Sichua |
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| Abstract:The Murong super-large granite pegmatite-type spodumene deposit in Yajiang of western Sichuan is the largest known single spodumene deposit in Asia. This work aims to study the geological background of mineralization, the characteristics of the mineralized pegmatite veins, ore-controlling structures, and the element zoning characteristics. It proposes the characteristics of metamorphic zones and pegmatite vein types, discovering that the veins exhibit a vertical zoning feature with niobium-tantalum mineralization in the shallow parts and lithium mineralization predominantly in the deeper parts. Additionally, the mineral assemblage of the main vein shows lateral zoning characteristics. It is pointed out that the mineralized granite pegmatite veins are of only one type, "albite spodumene," and the "garnet zone-andalusite zone-staurolite zone" Barrovian metamorphic zone is characterized by a narrow strip-like feature, which is of thermal contact metamorphic origin. This is significantly different from the five types of pegmatite veins exposed in a ring-like pattern in the Jiajika and Ke'eryin areas of western Sichuan, as well as the large-scale appearance of Barrovian metamorphic zones. The study suggests that the Murong area is controlled by a north-east trending structure with a characteristic of initial compression followed by extension, which is significantly different from the adjacent Jiajike mining field, indicating different styles of ore-controlling characteristics in the Yajiang dome group. Judged from the distance of action of the ore-forming parent rock, it is determined that the Murong lithium deposit is an independent ore-forming center, providing a basis for further exploration work. |
| keywords:vertical zonation, lateral zonation, ore-controlling structure, spodumene, ?Murong lithium deposit,Yajiang dome group, western Sichuan Province |
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