"Coupled Deep-Mantle Carbon-Water Cycle: Evidence From Lower-Mantle Dia" by Wenzhong Wang, Oliver Tschauner et al.
 

Document Type

Article

Publication Date

5-28-2021

Publication Title

The Innovation

Volume

2

Issue

2

First page number:

1

Last page number:

6

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 H O-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 at temperatures 200–500 K below average mantle temperature that match the pressure-temperature conditions of decomposing dense hydrous mantle silicates. Our work presents strong evidence for coupled recycling of water and carbon in the deep mantle based on natural samples. 2

Keywords

Deep mantle; Diamond; First-principles calculations; Water and carbon cycle

Disciplines

Geology

File Format

pdf

File Size

1473 KB

Language

English

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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