气候变化领域集成服务门户(CCPortal): Platinum group element mobilization in the mantle enhanced by recycled sedimentary carbonate

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DOI	10.1016/j.epsl.2020.116262
	Platinum group element mobilization in the mantle enhanced by recycled sedimentary carbonate
	He D.; Liu Y.; Moynier F.; Foley S.F.; Chen C.
发表日期	2020
ISSN	0012821X
卷号	541
英文摘要	Sulfides are the main host of platinum-group elements (PGE) in the mantle and the stability of sulfide controls PGE mobilization and enrichment. The enrichment of PGE in mantle melts is generally interpreted as the result of complete dissolution of sulfide during the high-degree melting. However, the mechanism by which PGE are transferred from sulfides to the melt is not well known. Here we show that in areas where sedimentary carbonate is recycled, PGE mobility in the mantle could be greatly increased by the transformation of sulfide into sulfate. Carbonatitic xenoliths from the Neogene Dalihu basalt in Inner Mongolia represent sedimentary carbonates recycled into the mantle, documented by limestone-like trace element patterns and high 87Sr/86Sr ratios. They also contain micro-diamonds and silicate minerals with chemical features of mantle peridotite, showing that they must have resided in the mantle. However, the carbonatitic xenoliths contain 1000 times more PGE than sedimentary carbonate, indicating the incorporation of mantle sulfide. Moreover, δ34Ssulfate values (9.6-10.2‰) are much lower than in the original limestone source (25-35‰), and higher Ni, Cu contents in the carbonate groundmass than in sedimentary carbonates suggest that sulfide had been transformed into sulfate. With the destruction of sulfide, PGE contained in sulfide was released into the carbonate melt, thus promoting their mobility in the mantle. © 2020 Elsevier B.V.
关键词	Bushveld complex carbonatite deep carbon cycle PGE platinum group elements
英文关键词	Carbonates; Carbonation; Economic geology; Lime; Limestone; Platinum; Recycling; Sedimentology; Silicate minerals; Sulfur compounds; Trace elements; Carbonate melts; Chemical features; Complete dissolution; Cu content; Inner Mongolia; Mantle melt; Platinum group elements; Trace element patterns; Copper compounds; carbonate rock; concentration (composition); crustal recycling; mantle source; mobilization; platinum group element; sedimentary rock; sulfide group; China; Nei Monggol
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202635
作者单位	State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, 430074, China; Institut de Physique du Globe de Paris, Université de Paris, CNRS UMR 7154, Paris Cedex 05, 75238, France; RC Centre of Excellence for Core to Crust Fluid Systems, Dept. of Earth and Planetary Sciences, Macquarie University, North RydeNew South Wales 2109, Australia
推荐引用方式 GB/T 7714	He D.,Liu Y.,Moynier F.,et al. Platinum group element mobilization in the mantle enhanced by recycled sedimentary carbonate[J],2020,541.
APA	He D.,Liu Y.,Moynier F.,Foley S.F.,&Chen C..(2020).Platinum group element mobilization in the mantle enhanced by recycled sedimentary carbonate.Earth and Planetary Science Letters,541.
MLA	He D.,et al."Platinum group element mobilization in the mantle enhanced by recycled sedimentary carbonate".Earth and Planetary Science Letters 541(2020).