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

被引：9

作者：

Wang, Wenzhong ^{[1
,6
,7
]}

Tschauner, Oliver ^{[2
]}

Huang, Shichun ^{[2
]}

Wu, Zhongqing ^{[1
,3
]}

Meng, Yufei ^{[4
]}

Bechtel, Hans ^{[5
]}

Mao, Ho-Kwang ^{[4
]}

机构：

[1] Univ Sci & Technol China, Sch Earth & Space Sci, Lab Seismol & Phys Earths Interior, Hefei 230026, Peoples R China

[2] Univ Nevada, Dept Geosci, Las Vegas, NV 89154 USA

[3] USTC, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China

[4] Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China

[5] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[6] UCL, Dept Earth Sci, London WC1E 6BT, England

[7] Carnegie Inst Sci, Earth & Planets Lab, Washington, DC 20015 USA

来源：

INNOVATION | 2021年 / 2卷 / 02期

关键词：

diamond; deep mantle; water and carbon cycle; first-principles calculations; INFRARED-ABSORPTION; EARTHS MANTLE; INCLUSIONS; PSEUDOPOTENTIALS; PERIDOTITE; STABILITY; SYSTEMS; DEPTH; FLUID; JUINA;

D O I：

10.1016/j.xinn.2021.100117

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 iceVII-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.

引用

页数：7

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