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Position: Home > issue > May 28, 2021 Volume 2, Issue 2
Coupled deep-mantle carbon-water cycle: Evidence from lower-mantle diamonds
Category: Report
Author: Wenzhong Wang, Oliver Tschauner, Shichun Huang, Zhongqing Wu, Yufei Meng, Hans Bechtel, Ho-Kwang Mao

2.jpg

Graphical 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 í└ 60 km but at temperatures 200ĘC500 K below average mantle temperature that match the pressure-temperature conditions of decomposing dense hydrous mantle silicates.





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