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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1.四川省国土科学技术研究院;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;3.四川省第七地质大队;4.[ ]

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(编号:2023NSFSC0270)联合资助.


The ore-forming effects of the Emeishan mantle plume upwelling event: research progress and prospects
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1.Sichuan Institute of Land Science and Technology;2.[ ]

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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。本文认为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 hot research topic of scholars at home and abroad, but the scholars ' research on the Emeishan mantle plume is mostly focused on its own basic theoretical research, and the research on the metallogenic effect is relatively weak, especially the research on the indirect mineralization of the Emeishan mantle plume. In order to supplement and improve the Emeishan mantle plume metallogenic system, this paper systematically summarizes the research results in recent years, and summarizes the characteristics and genesis of various deposit types. On this basis, the temporal and spatial distribution and evolution history of the deposit are combed, and the research focus and prospecting direction of the future Emeishan mantle plume metallogenic system are proposed. First of all, according to the time relationship between the mineralization and the upwelling of the Emeishan mantle plume, it is divided into two types : 1 The mineralization directly related to the Emeishan mantle plume is consistent or later ; 2 The mineralization indirectly related to the Emeishan mantle plume, and the mineralization was obviously intermittent with the upwelling of the Emeishan mantle plume in time, but it had indirect genetic relationship with the Emeishan mantle plume ; the types of deposits directly related to the Emeishan mantle plume include magmatic deposits and hydrothermal deposits. The former includes the Cu-Ni-PGE magmatic sulfide deposits related to the fusion of mafic-ultramafic magmatic sulfides, the V-Ti-Fe magmatic oxide deposits related to the crystallization differentiation of mafic-ultramafic magma, and the volcanic Fe deposits related to the volcanic eruption of overflow basalts. The latter is Nb-Ta-Zr-REE deposits related to syenite veins. The types of deposits indirectly related to the Emeishan mantle plume include the types of deposits that provide mineral sources, the types of deposits that provide ore transport channels, and the types of deposits that provide metallogenic space. They include six types of deposits, namely, modern weathering crust type, modern sand type, ancient weathering crust type, ancient weathering crust-sedimentary type, sedimentary type and hydrothermal type. The types of REE deposits of carbonate-feldspar complex in Panxi area, oil and gas deposits, and coal-copper-rhenium-molybdenum deposits and oil and gas deposits in Panxi ancient rift. Secondly, the spatial and temporal distribution and evolution history of the deposit are analyzed. The study shows that the metallogenic age of the deposit directly related to the Emeishan mantle plume is basically consistent with the formation age of the Emeishan large igneous province. The deposit is mainly distributed in the north-south fault zone, which is closely related to the magmatic channel, and has metallogenic zonation in the vertical direction of the magmatic channel. The metallogenic epoch of deposits indirectly related to the mantle plume of Emeishan is obviously lagging behind the formation age of Emeishan igneous province, and the metallogenic epochs of various deposits are relatively dispersed. In space, they are mainly distributed in the middle and outer zones of Emeishan igneous province, and have the characteristics of dispersion and horizon. The evolution history of deposits directly related to the Emeishan mantle plume is closely related to the magmatism and hydrothermal processes occurring at different spatial locations in the magma channel during the upwelling of the Emeishan mantle plume. The evolution history of deposits indirectly related to the Emeishan mantle plume is closely related to the provenance layer or the initial enrichment layer of metallogenic elements, paleo-deep faults and ore storage space provided after the formation of the Emeishan igneous province, and different deposit types have different evolution characteristics. In this paper, it is believed that the Emeishan mantle plume metallogenic system has bred most of the key minerals such as rare, rare earth, scattered and rare precious metals. The deposit types are diverse and the metallogenic potential is large. It is suggested that the research on the metallogenic theory, metallogenic mechanism, metallogenic prediction, comprehensive recovery and utilization technology and diversified prospecting of metallogenic elements of the Emeishan mantle plume metallogenic system should be strengthened, which can greatly improve the guarantee ability of key minerals in China.

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  • 收稿日期:2024-05-14
  • 最后修改日期:2024-07-04
  • 录用日期:2024-11-24
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