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
File Size
1473 KB
Language
English
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.
Repository Citation
Wang, W.,
Tschauner, O.,
Huang, S.,
Wu, Z.,
Meng, Y.,
Bechtel, H.,
Mao, H.
(2021).
Coupled Deep-Mantle Carbon-Water Cycle: Evidence From Lower-Mantle Diamonds.
The Innovation, 2(2),
1-6.
http://dx.doi.org/10.1016/j.xinn.2021.100117