Formation mechanism and geochemical process of porphyry molybdenum deposits

doi:10.18654/1000-0569/2020.01.09

	Formation mechanism and geochemical process of porphyry molybdenum deposits
	Li CongYing 1,2,3; Liao RenQiang1,3,4
	2020
发表期刊	ACTA PETROLOGICA SINICA
ISSN	1000-0569
卷号	36 期号:1 页码:77-84
通讯作者	Li CongYing(licongying@qdio.ac.cn)
摘要	Porphyry Mo deposits are the most important type of Mo deposits, which account for over 90% of Mo reserves in the world. Porphyry Mo deposits can be classified as porphyry Cu-Mo deposits, high-fluorine porphyry Mo deposits and low-fluorine porphyry Mo deposits. They are mainly distributed on the convergent plate margins such as the circum-Pacific metallogenic belt, and closely related to plate subduction. Based on the statistical analysis of the spatial and temporal distribution of global porphyry Mo deposits and the geochemical properties of element Mo, we believe that the material source of porphyry Mo deposits is Mo-rich sediments formed by initial enrichment of Mo element through supergene geochemical processes. Since the Mo-rich black shale appeared in large quantities after the rise of atmospheric oxygen around 550Ma, the porphyry Mo deposits were mainly formed after 500Ma. During the process of plate subduction, sediments such as Mo-rich black shale dehydrated and form metamorphic fluids rich in Mo and Re. Then the metamorphic fluid metasomatized the overlying mantle wedge to retain Mo and Re. With the partial melting of the subduction oceanic crust, magma rich in Cu ( Au) was formed and passed through the overlying mantle wedge and led to the formation of porphyry Cu-Mo deposits. In the process of plate retreat, the upwelling of asthenospheric mantle would cause the decomposition of polysilicate muscovite. The magma then passed through the overlying mantle wedge rich in Mo, forming high fluorine porphyry deposits. However, the formation of low fluorine molybdenum deposits is likely to have little relationship with plate subduction. Sediments rich in molybdenum formed by high chemical weathering would accumulate in areas such as paleo back arc basin, and then deeply buried during orogeny, forming low fluorine porphyry molybdenum ore under appropriate conditions.
关键词	Porphyry molybdenum deposit Material source Subduction Black sediment
DOI	10.18654/1000-0569/2020.01.09
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geology
WOS记录号	WOS:000533247400009
出版者	SCIENCE PRESS
引用统计	被引频次：5[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/167494
专题	深海极端环境与生命过程研究中心
通讯作者	Li CongYing
作者单位	1.Chinese Acad Sci, Ctr Deep Sea Res, Inst Oceanol, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Mineral Resources, Qingdao 266237, Peoples R China 3.Chinese Acad Sci, Ctr Ocean Megasci, Qingdao 266071, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
第一作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
通讯作者单位	中国科学院海洋研究所; 中国科学院海洋大科学研究中心
推荐引用方式 GB/T 7714	Li CongYing,Liao RenQiang. Formation mechanism and geochemical process of porphyry molybdenum deposits[J]. ACTA PETROLOGICA SINICA,2020,36(1):77-84.
APA	Li CongYing,&Liao RenQiang.(2020).Formation mechanism and geochemical process of porphyry molybdenum deposits.ACTA PETROLOGICA SINICA,36(1),77-84.
MLA	Li CongYing,et al."Formation mechanism and geochemical process of porphyry molybdenum deposits".ACTA PETROLOGICA SINICA 36.1(2020):77-84.

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