峨眉山地幔柱上涌事件的成矿效应——研究进展与展望
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本文为四川省自然科学基金资助项目(编号:2023NSFSC0270)、四川省自然资源厅科技项目(编号:kj- 2022- 6)及2024年新一轮找矿突破战略行动科技支撑项目(编号:ZKKJ202411)的成果


The ore- forming effects of the Emeishan mantle plume upwelling event——Research progress and prospects
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  • 1) 四川省国土科学技术研究院,成都,610045;2) 自然资源部复杂构造区页岩气勘探开发工程技术创新中心,成都,610045    
  • 1)Sichuan Institute of Land Science and Technology, Chengdu, 610045;2)Technical innovation center of shale gas exploration and development engineering in complex structural area, Ministry of natural resources, Chengdu, 610045    
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    摘要:

    峨眉山地幔柱一直以来都是国内外学者的研究热点,但对峨眉山地幔柱的研究多集中于基础理论研究,与成矿效应有关的研究相对较少。为了补充和完善峨眉山地幔柱成矿系统,本文对近年来的研究成果进行了系统归纳,总结了各种矿床类型的特征及成因。在此基础上,梳理了矿床时空分布规律和演化历史,并提出了未来峨眉山地幔柱成矿系统的研究重点和找矿方向。首先,按照成矿作用与峨眉山地幔柱上涌的时间关系,划分为两种类型:①伴随着峨眉山地幔柱上涌,在上涌过程中会发生岩浆成矿作用和热液成矿作用,最终分别形成了岩浆矿床和热液矿床,这些矿床称之为与峨眉山地幔柱直接相关的矿床类型;②在峨眉山地幔柱结束上涌后,并且间断一定时间之后,峨眉山地幔柱上涌事件为矿床提供成矿物质来源、运矿通道和成矿空间,这些矿床称之为与峨眉山地幔柱间接相关的矿床类型。其次,分析了矿床时空分布规律和演化历史;结果显示与峨眉山地幔柱直接相关的矿床的成矿时代集中在260Ma附近;在空间上,主要分布在南北向断裂带上,与岩浆通道密切相关,且在岩浆通道垂向上具有成矿分带性;其演化历史与峨眉山地幔柱上涌过程中在岩浆通道中的不同空间位置发生的岩浆作用和热液作用密切相关。与峨眉山地幔柱间接相关的矿床的成矿时代较为分散;在空间上,主要分布在峨眉山大火成岩省中带和外带,并具有分散性、层位性特点;其演化历史与峨眉山大火成岩省形成之后提供的物源层或成矿元素初始富集层、古深大断裂和储矿空间息息相关,并且不同的矿床类型具有不同的演化特点。峨眉山地幔柱成矿系统孕育了丰富的稀有、稀土、稀散和稀贵金属等绝大部分关键矿产,矿床类型多样,成矿潜力大。建议加强峨眉山地幔柱成矿系统在成矿理论、成矿机制、成矿预测、综合回收利用技术和成矿元素多元化找矿等方面的研究,可大大提升中国关键矿产的保障能力。

    Abstract:

    The Emeishan mantle plume has always been a research hotspot for scholars at home and abroad, but research on the Emeishan mantle plume has mostly focused on basic theoretical studies, with relatively few studies related to mineralization effects.In order to supplement and improve the Emeishan mantle plume mineralization system, the existing research results are reviewed.Methods: This article systematically summarizes the research results in recent years, and summarizes the characteristics and genesis of various types of mineral deposits.Results:On this basis, the spatiotemporal distribution patterns and evolutionary history of mineral deposits were sorted out, and the research focus and prospecting direction for the future Emeishan mantle plume mineralization system were proposed.Firstly, according to the temporal relationship between mineralization and the upwelling of the Emeishan mantle plume, it can be divided into two types: (1)Along with the upwelling of the Emei Mountain mantle plume, magma mineralization and hydrothermal mineralization occur during the upwelling process, ultimately forming magma deposits and hydrothermal deposits, respectively. These deposits are called the types directly related to the Emei Mountain mantle plume. (2)After the end of the upwelling of the Emeishan mantle plume and a certain period of interruption, the upwelling event of the Emeishan mantle plume provides material sources for mineralization, transport channels, and mineralization space for the deposits, which are called deposit types indirectly related to the Emeishan mantle plume.Secondly, the spatiotemporal distribution pattern and evolutionary history of the mineral deposit were analyzed.The results show that the mineralization age of the deposits directly related to the Emeishan mantle plume is concentrated around 260 Ma.In space, it is mainly distributed on north—south fault zones, closely related to magma channels, and has mineralization zoning in the vertical direction of magma channels.The evolutionary history of mineral deposits directly related to the Emeishan mantle plume is closely related to the magmatic and hydrothermal processes that occurred at different spatial positions in the magma channels during the upwelling process of the Emeishan mantle plume.The mineralization ages of mineral deposits indirectly related to the Emeishan mantle plume are relatively scattered.In terms of space, it is mainly distributed in the middle and outer zones of the Emeishan Large Igneous Province, and has characteristics of dispersion and stratigraphic distribution.The evolutionary history of mineral deposits indirectly related to the Emeishan mantle plume is closely related to the source layers or initial enrichment layers of ore- forming elements, ancient deep faults, and storage spaces provided after the formation of the Emeishan Large Igneous Province, and different types of mineral deposits have different evolutionary characteristics.The Emeishan mantle plume metallogenic system has bred most of the key minerals such as rare, rare earth, scattered, rare and precious metals.Conclusions:The Emeishan mantle plume mineralization system has nurtured abundant rare earth, rare earth, scattered, and precious metals, among the vast majority of key mineral resources. The deposit types are diverse and have great potential for mineralization.It is suggested to strengthen the research on the mineralization theory, mechanism, prediction, comprehensive recovery and utilization technology, and diversified exploration of ore- forming elements in the Emeishan mantle plume mineralization system, which can greatly enhance the guarantee capability of China's key mineral resources.

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引用本文

刘治成.2024.峨眉山地幔柱上涌事件的成矿效应——研究进展与展望[J].地质论评,70(6):2024060007,[DOI].
LIU Zhicheng.2024. The ore- forming effects of the Emeishan mantle plume upwelling event——Research progress and prospects[J]. Geological Review,70(6):2024060007.

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  • 收稿日期:2024-05-14
  • 最后修改日期:2024-10-19
  • 在线发布日期: 2024-11-19
  • 出版日期: 2024-11-15