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Coupled deep mantle carbon-water cycle: Evidence from lower-mantle diamonds

Wang, W; Tschauner, O; Huang, S; Wu, Z; Meng, Y; Bechtel, H; Mao, H-K; (2021) Coupled deep mantle carbon-water cycle: Evidence from lower-mantle diamonds. The Innovation , 2 (2) , Article 100117. 10.1016/j.xinn.2021.100117. Green open access

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Abstract

Diamonds form in a variety of environments between subducted crust, lithospheric and deep mantle. Recently, deep source diamonds with inclusions of the high-pressure H2O-phase ice-VII were discovered. By correlating the pressures of ice-VII inclusions with those of other high-pressure inclusions, we assess quantitatively the pressures and temperatures of their entrapment. We show that the ice-VII-bearing diamonds formed at depths down to 800 ± 60 km but temperatures 200-500 K below average mantle temperature that matches the decomposition pressure-temperature conditions of dense hydrous mantle silicates. Our work presents strong evidence for the coupled recycling of water and carbon in the deep mantle based on natural samples.

Type: Article
Title: Coupled deep mantle carbon-water cycle: Evidence from lower-mantle diamonds
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.xinn.2021.100117
Publisher version: http://dx.doi.org/10.1016/j.xinn.2021.100117
Language: English
Additional information: © 2021 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10128103
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