Natural diamond formation by self-redox of ferromagnesian carbonate

被引：24

作者：

Chen, Ming ^{[1
,2
]}

Shu, Jinfu ^{[3
]}

Xie, Xiande ^{[2
,4
]}

Tan, Dayong ^{[2
,4
]}

Mao, Ho-kwang ^{[3
,5
]}

机构：

[1] Chinese Acad Sci, Guangzhou Inst Geochem, State Key Lab Isotope Geochem, Guangzhou 510640, Guangdong, Peoples R China

[2] Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510640, Guangdong, Peoples R China

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

[4] Chinese Acad Sci, Guangzhou Inst Geochem, Guangdong Prov Key Lab Mineral Phys & Mat, Guangzhou 510640, Guangdong, Peoples R China

[5] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2018年 / 115卷 / 11期

基金：

中国国家自然科学基金;

关键词：

diamond; self-redox; ferromagnesium carbonate; shock-metamorphism; lower mantle; HIGH-PRESSURE PHASE; MINERAL INCLUSIONS; XIUYAN CRATER; EARTHS MANTLE; SPECTROSCOPY; SUBDUCTION; INTERIOR; COESITE; MGFE2O4; CHINA;

D O I：

10.1073/pnas.1720619115

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：

Formation of natural diamonds requires the reduction of carbon to its bare elemental form, and pressures (P) greater than 5 GPa to cross the graphite-diamond transition boundary. In a study of shocked ferromagnesian carbonate at the Xiuyan impact crater, we found that the impact pressure-temperature (P-T) of 25-45 GPa and 800-900 degrees C were sufficient to decompose ankerite Ca(Fe2+, Mg)(CO3)(2) to form diamond in the absence of another reductant. The carbonate self-reduced to diamond by concurrent oxidation of Fe2+ to Fe3+ to form a high-P polymorph of magnesioferrite, MgFe23+O4. Discovery of the subsolidus carbonate self-reduction mechanism indicates that diamonds could be ubiquitously present as a dominant host for carbon in the Earth's lower mantle.

引用

页码：2676 / 2680

页数：5

共 39 条

[1]

Akaogi M., 1992, High-pressure research, P447, DOI [10.1029/GM067p0447, DOI 10.1029/GM067P0447]

[2] Diamond-graphite phase transition in ultradisperse-diamond clusters [J].

Aleksenskii, AE ;

Baidakova, MV ;

Vul, AY ;

Davydov, VY ;

Pevtsova, YA .

PHYSICS OF THE SOLID STATE, 1997, 39 (06) :1007-1015

[3] High-pressure phase transformations in the MgFe2O4 and Fe2O3-MgSiO3 systems [J].

Andrault, D ;

Bolfan-Casanova, N .

PHYSICS AND CHEMISTRY OF MINERALS, 2001, 28 (03) :211-217

[4]

[Anonymous], 2006, Meteorites and the Early Solar System II, DOI DOI 10.2307/J.CTV1V7ZDMM.37

[5] Experimental investigation of the stability of Fe-rich carbonates in the lower mantle [J].

Boulard, E. ;

Menguy, N. ;

Auzende, A. L. ;

Benzerara, K. ;

Bureau, H. ;

Antonangeli, D. ;

Corgne, A. ;

Morard, G. ;

Siebert, J. ;

Perrillat, J. P. ;

Guyot, F. ;

Fiquet, G. .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2012, 117

[6] Stability of iron-bearing carbonates in the deep Earth's interior [J].

Cerantola, Valerio ;

Bykova, Elena ;

Kupenko, Ilya ;

Merlini, Marco ;

Ismailova, Leyla ;

McCammon, Catherine ;

Bykov, Maxim ;

Chumakov, Alexandr I. ;

Petitgirard, Sylvain ;

Kantor, Innokenty ;

Svitlyk, Volodymyr ;

Jacobs, Jeroen ;

Hanfland, Michael ;

Mezouar, Mohamed ;

Prescher, Clemens ;

Ruffer, Rudolf ;

Prakapenka, Vitali B. ;

Dubrovinsky, Leonid .

NATURE COMMUNICATIONS, 2017, 8

[7] 1ST NATURAL OCCURRENCE OF COESITE [J].

CHAO, ECT ;

SHOEMAKER, EM ;

MADSEN, BM .

SCIENCE, 1960, 132 (3421) :220-222

[8] Natural occurrence and synthesis of two new postspinel polymorphs of chromite [J].

Chen, M ;

Shu, JF ;

Mao, HK ;

Xie, XD ;

Hemley, RJ .

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2003, 100 (25) :14651-14654

[9] High-pressure polymorph of TiO2-II from the Xiuyan crater of China [J].

Chen Ming ;

Gu XiangPing ;

Xie XianDe ;

Yin Feng .

CHINESE SCIENCE BULLETIN, 2013, 58 (36) :4655-4662

[10] Natural occurrence of reidite in the Xiuyan crater of China [J].

Chen, Ming ;

Yin, Feng ;

Li, Xiaodong ;

Xie, Xiande ;

Xiao, Wansheng ;

Tan, Dayong .

METEORITICS & PLANETARY SCIENCE, 2013, 48 (05) :796-805

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