Temperature-induced amorphization in CaCO3 at high pressure and implications for recycled CaCO3 in subduction zones

被引：39

作者：

Hou, Mingqiang ^{[1
,2
]}

Zhang, Qian ^{[1
]}

Tao, Renbiao ^{[3
]}

Liu, Hong ^{[4
]}

Kono, Yoshio ^{[5
,6
]}

Mao, Ho-kwang ^{[1
,3
]}

Yang, Wenge ^{[1
]}

Chen, Bin ^{[1
]}

Fei, Yingwei ^{[3
]}

机构：

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

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

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

[4] China Earthquake Adm, Inst Earthquake Sci, CEA Key Lab Earthquake Predict, Beijing 100036, Peoples R China

[5] Carnegie Inst Sci, Geophys Lab, HPCAT, Argonne, IL 60439 USA

[6] Ehime Univ, Geodynam Res Ctr, Matsuyama, Ehime 7908577, Japan

来源：

NATURE COMMUNICATIONS | 2019年 / 10卷 / 1期

关键词：

ELASTIC-WAVE VELOCITY; X-RAY-DIFFRACTION; PHASE-RELATIONS; MANTLE; CARBON; MELT; TRANSITION; MAGNESITE; GPA; GEOCHEMISTRY;

D O I：

10.1038/s41467-019-09742-5

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：

Calcium carbonate (CaCO3) significantly affects the properties of upper mantle and plays a key role in deep carbon recycling. However, its phase relations above 3 GPa and 1000 K are controversial. Here we report a reversible temperature-induced aragonite-amorphization transition in CaCO3 at 3.9-7.5 GPa and temperature above 1000 K. Amorphous CaCO3 shares a similar structure as liquid CaCO3 but with much larger C-O and Ca-Ca bond lengths, indicating a lower density and a mechanism of lattice collapse for the temperature-induced amorphous phase. The less dense amorphous phase compared with the liquid provides an explanation for the observed CaCO3 melting curve overturn at about 6 GPa. Amorphous CaCO3 is stable at subduction zone conditions and could aid the recycling of carbon to the surface.

引用

页数：8

共 60 条

[1]

Ague JJ, 2014, NAT GEOSCI, V7, P355, DOI [10.1038/NGEO2143, 10.1038/ngeo2143]

[2]

[Anonymous], 2008, GEOL SURV CANADA, DOI DOI 10.4095/225115

[3] Mantle dynamics beneath the East Pacific Rise at 17°S:: Insights from the Mantle Electromagnetic and Tomography (MELT) experiment [J].

Baba, K ;

Chave, AD ;

Evans, RL ;

Hirth, G ;

Mackie, RL .

JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH, 2006, 111 (B2)

[4]

Bridgman PW, 1939, AM J SCI, V237, P7

[5]

DALNEGRO A, 1971, AM MINERAL, V56, P768

[6] Trace element partitioning between garnet lherzolite and carbonatite at 6.6 and 8.6 GPa with applications to the geochemistry of the mantle and of mantle-derived melts [J].

Dasgupta, Rajdeep ;

Hirschmann, Marc M. ;

McDonough, William F. ;

Spiegelman, Marc ;

Withers, Anthony C. .

CHEMICAL GEOLOGY, 2009, 262 (1-2) :57-77

[7] Pressure-induced amorphization and an amorphous-amorphous transition in densified porous silicon [J].

Deb, SK ;

Wilding, M ;

Somayazulu, M ;

McMillan, PF .

NATURE, 2001, 414 (6863) :528-530

[8] PRELIMINARY REFERENCE EARTH MODEL [J].

DZIEWONSKI, AM ;

ANDERSON, DL .

PHYSICS OF THE EARTH AND PLANETARY INTERIORS, 1981, 25 (04) :297-356

[9] ORIGIN OF THE 1ST-SHARP DIFFRACTION PEAK IN THE STRUCTURE FACTOR OF COVALENT GLASSES [J].

ELLIOTT, SR .

PHYSICAL REVIEW LETTERS, 1991, 67 (06) :711-714

[10] Geophysical evidence from the MELT area for compositional controls on oceanic plates [J].

Evans, RL ;

Hirth, G ;

Baba, K ;

Forsyth, D ;

Chave, A ;

Mackie, R .

NATURE, 2005, 437 (7056) :249-252

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