DOI: 10.1016/j.epsl.2020.116262
论文题名: Platinum group element mobilization in the mantle enhanced by recycled sedimentary carbonate
作者: He D. ; Liu Y. ; Moynier F. ; Foley S.F. ; Chen C.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 541 语种: 英语
中文关键词: 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
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/165013
Appears in Collections: 气候变化与战略
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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
Recommended Citation:
He D.,Liu Y.,Moynier F.,et al. Platinum group element mobilization in the mantle enhanced by recycled sedimentary carbonate[J]. Earth and Planetary Science Letters,2020-01-01,541