globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo2965
论文题名:
Cumulate causes for the low contents of sulfide-loving elements in the continental crust
作者: Jenner F.E.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期:7
起始页码: 524
结束页码: 529
语种: 英语
Scopus关键词: continental crust ; cooling ; delamination ; magma ; mantle ; mid-ocean ridge basalt ; oceanic crust ; ore deposit ; partitioning ; saturation ; siderophile element ; subduction zone ; sulfide ; upper crust ; volcanic rock
英文摘要: Despite the economic importance of chalcophile (sulfide-loving) and siderophile (metal-loving) elements (CSEs), it is unclear how they become enriched or depleted in the continental crust, compared with the oceanic crust. This is due in part to our limited understanding of the partitioning behaviour of the CSEs. Here I compile compositional data for mid-ocean ridge basalts and subduction-related volcanic rocks. I show that the mantle-derived melts that contribute to oceanic and continental crust formation rarely avoid sulfide saturation during cooling in the crust and, on average, subduction-zone magmas fractionate sulfide at the base of the continental crust prior to ascent. Differentiation of mantle-derived melts enriches lower crustal sulfide- and silicate-bearing cumulates in some CSEs compared with the upper crust. This storage predisposes the cumulate-hosted compatible CSEs (such as Cu and Au) to be recycled back into the mantle during subduction and delamination, resulting in their low contents in the bulk continental crust and potentially contributing to the scarcity of ore deposits in the upper continental crust. By contrast, differentiation causes the upper oceanic and continental crust to become enriched in incompatible CSEs (such as W) compared with the lower oceanic and continental crust. Consequently, incompatible CSEs are predisposed to become enriched in subduction-zone magmas that contribute to continental crust formation and are less susceptible to removal from the continental crust via delamination compared with the compatible CSEs.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105752
Appears in Collections:气候减缓与适应
科学计划与规划

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作者单位: School of Environment, Earth and Ecosystem Sciences, Open University, Walton Hall, Milton Keynes, Buckinghamshire, United Kingdom; Carnegie Institution of Washington, Department of Terrestrial Magnetism, Washington, DC, United States

Recommended Citation:
Jenner F.E.. Cumulate causes for the low contents of sulfide-loving elements in the continental crust[J]. Nature Geoscience,2017-01-01,10(7)
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