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Enhanced mantle-to-crust rhenium transfer in undegassed arc magmas

Citation

Sun, W and Bennett, VC and Eggins, SM and Kamenetsky, VS and Arculus, RJ, Enhanced mantle-to-crust rhenium transfer in undegassed arc magmas, Nature, 422, (6929) pp. 294-297. ISSN 0028-0836 (2003) [Refereed Article]

Copyright Statement

Copyright 2003 Nature Publishing Group

DOI: doi:10.1038/nature01482

Abstract

Variations in the 187Os/188Os isotopic signature of mantle and mantle-derived rocks have been thought to provide a powerful chemical tracer of deep Earth structure. Many studies have inferred from such data that a long-lived, high-rhenium component exists in the deep mantle (187Re is the parent isotope decaying to 187Os, with a half-life of ~42 billion years), and that this reservoir probably consists of subducted oceanic crust. The interpretation of these isotopic signatures is, however, dependent on accurate estimates of rhenium and osmium concentrations in all of the main geochemical reservoirs, and the crust has generally been considered to be a minor contributor to such global budgets. In contrast, we here present observations of high rhenium concentrations and low Yb/Re ratios in arc-type melt inclusions. These results indicate strong enrichment of rhenium in undegassed arc rocks, and consequently the continental crust, which results in a crustal estimate of ~2p.p.b. rhenium, as compared to previous estimates of 0.40.2p.p.b. Previous determinations of rhenium in arc materials, which were largely measured on subaerially erupted samples, are likely to be in error owing to rhenium loss during degassing. High mantle-to-crust rhenium fluxes, as observed here, require a revaluation of geochemical models based on the 187Re-187Os decay system.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geochemistry
Research Field:Geochemistry not elsewhere classified
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Kamenetsky, VS (Professor Vadim Kamenetsky)
ID Code:28046
Year Published:2003
Web of Science® Times Cited:88
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2003-08-01
Last Modified:2015-11-04
Downloads:0

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