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Cumulate causes for the low contents of sulfide-loving elements in the continental crust

Jenner, Frances Elaine (2017). Cumulate causes for the low contents of sulfide-loving elements in the continental crust. Nature Geoscience, 10(7) pp. 524–529.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1038/ngeo2965
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Abstract

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.

Item Type: Journal Item
ISSN: 1752-0908
Project Funding Details:
Funded Project NameProject IDFunding Body
Mantle volatiles: processes, reservoirs and fluxesNE/M000427/1NERC
Te and Se Cycling and Supply (TeaSe)NE/M010848/1NERC
Keywords: economic geology; geochemistry; geology; mineralogy
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Environment, Earth and Ecosystem Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Research Group: Health and Wellbeing PRA (Priority Research Area)
Item ID: 50893
Depositing User: Frances Jenner
Date Deposited: 12 Sep 2017 13:40
Last Modified: 02 May 2018 14:33
URI: http://oro.open.ac.uk/id/eprint/50893
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