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Title: Kinetic Control on the Depth Distribution of Superdeep Diamonds

Abstract

Superdeep diamonds contain unique information from the sublithospheric regions of Earth's interior. Recent studies imply that reaction between subducted carbonate and iron metal in the mantle plays an important role in the production of superdeep diamonds. It is unknown if this reaction is kinetically feasible in cold slabs subducted into the deep mantle. In this work we introduce experimental data on real-time tracking of the magnesite-iron reaction at high pressures and high temperatures to demonstrate the production of diamond at the surface conditions of cold slabs in the transition zone and lower mantle. Our data reveal that the diamond production rate has a positive temperature dependence and a negative pressure dependence, and along a slab geotherm it decreases by a factor of three at pressures from 14.4 to 18.4 GPa. This rate reduction provides an explanation for the rarity of superdeep diamonds from the interior of the mantle transition zone.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [4];  [5]
  1. Univ. of Michigan, Ann Arbor, MI (United States); Univ. of Hawaii, Honolulu, HI (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States); Univ. of Texas, Austin, TX (United States)
  4. Univ. of Hawaii, Honolulu, HI (United States)
  5. Argonne National Lab. (ANL), Lemont, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Scientific User Facilities Division; USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF); Alfred P. Sloan Foundation
OSTI Identifier:
1548285
Alternate Identifier(s):
OSTI ID: 1494957
Grant/Contract Number:  
AC02-06CH11357; NA0001974; G‐2017‐9954; G‐2016‐7157; DE‐AC02‐06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 46; Journal Issue: 4; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
reaction kinetics; redox reaction; slab-mantle interaction; superdeep diamond

Citation Formats

Zhu, Feng, Li, Jie, Liu, Jiachao, Lai, Xiaojing, Chen, Bin, and Meng, Yue. Kinetic Control on the Depth Distribution of Superdeep Diamonds. United States: N. p., 2018. Web. doi:10.1029/2018gl080740.
Zhu, Feng, Li, Jie, Liu, Jiachao, Lai, Xiaojing, Chen, Bin, & Meng, Yue. Kinetic Control on the Depth Distribution of Superdeep Diamonds. United States. doi:10.1029/2018gl080740.
Zhu, Feng, Li, Jie, Liu, Jiachao, Lai, Xiaojing, Chen, Bin, and Meng, Yue. Fri . "Kinetic Control on the Depth Distribution of Superdeep Diamonds". United States. doi:10.1029/2018gl080740.
@article{osti_1548285,
title = {Kinetic Control on the Depth Distribution of Superdeep Diamonds},
author = {Zhu, Feng and Li, Jie and Liu, Jiachao and Lai, Xiaojing and Chen, Bin and Meng, Yue},
abstractNote = {Superdeep diamonds contain unique information from the sublithospheric regions of Earth's interior. Recent studies imply that reaction between subducted carbonate and iron metal in the mantle plays an important role in the production of superdeep diamonds. It is unknown if this reaction is kinetically feasible in cold slabs subducted into the deep mantle. In this work we introduce experimental data on real-time tracking of the magnesite-iron reaction at high pressures and high temperatures to demonstrate the production of diamond at the surface conditions of cold slabs in the transition zone and lower mantle. Our data reveal that the diamond production rate has a positive temperature dependence and a negative pressure dependence, and along a slab geotherm it decreases by a factor of three at pressures from 14.4 to 18.4 GPa. This rate reduction provides an explanation for the rarity of superdeep diamonds from the interior of the mantle transition zone.},
doi = {10.1029/2018gl080740},
journal = {Geophysical Research Letters},
number = 4,
volume = 46,
place = {United States},
year = {2018},
month = {12}
}

Journal Article:
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Works referenced in this record:

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