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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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1945-3027
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Volume 98, Issue 10

Issues

P-V-T relations of γ-Ca3(PO4)2 tuite determined by in situ X-ray diffraction in a large-volume high-pressure apparatus

Shuangmeng Zhai
  • Corresponding author
  • Key Laboratory of Orogenic Belts and Crustal Evolution, MOE; School of Earth and Space Sciences, Peking University, Beijing 100871, China
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/ Daisuke Yamazaki
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
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/ Weihong Xue
  • Key Laboratory of Orogenic Belts and Crustal Evolution, MOE; School of Earth and Space Sciences, Peking University, Beijing 100871, China
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/ Lijin Ye
  • Key Laboratory of Orogenic Belts and Crustal Evolution, MOE; School of Earth and Space Sciences, Peking University, Beijing 100871, China
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/ Chaowen Xu
  • Key Laboratory of Orogenic Belts and Crustal Evolution, MOE; School of Earth and Space Sciences, Peking University, Beijing 100871, China
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/ Shuangming Shan / Eiji Ito
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
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/ Akira Yoneda
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
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/ Takashi Yoshino
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
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/ Xinzhuan Guo
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
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/ Akira Shimojuku
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
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/ Noriyoshi Tsujino
  • Institute for Study of the Earth’s Interior, Okayama University, Misasa, Tottori 682-0193, Japan
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/ Ken-Ichi Funakoshi
Published Online: 2015-03-07 | DOI: https://doi.org/10.2138/am.2013.4403

Abstract

Tuite, γ-Ca3(PO4)2, is regarded as an important phosphate mineral in the deep mantle playing a crucial role as a host for rare earth elements, large ion lithophile elements, and phosphorus. In this study we report the thermoelastic properties of synthetic γ-Ca3(PO4)2 at simultaneously high pressures and temperatures of up to 35.4 GPa and 1300 K, respectively, as determined by means of in situ energydispersive X‑ray diffraction in a large-volume multi-anvil apparatus. The pressure-volume-temperature data obtained for γ-Ca3(PO4)2 were fitted by the high-temperature Birch-Murnaghan equation of state to yield V2 = 447.4(4) Å3, KT0 = 100.8(18) GPa, K′T0 = 5.74(13), (∂KT/∂T)P = -0.020(1) GPa/K, and αT = 3.26(18) × 10-5 + 1.76(24) × 10-8 T. In addition, fitting the present data to the Mie-Grüneisen-Debye equation of state gives γ0 = 1.35(6), Θ0 = 944(136) K, and q = 0.37(29). Based on the thermoelastic properties obtained in our study, the density profiles of γ-Ca3(PO4)2 tuite along typical cold and hot slab geotherms were calculated and are compared with those of the coexisting silicate minerals in subducting mid-ocean ridge basalt.

Keywords : γ-Ca3(PO4)2 tuite; in situ X‑ray diffraction; thermal equation of state; thermoelastic properties

About the article

Received: 2012-11-04

Accepted: 2013-05-27

Published Online: 2015-03-07

Published in Print: 2013-10-01


Citation Information: American Mineralogist, Volume 98, Issue 10, Pages 1811–1816, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2013.4403.

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© 2015 by Walter de Gruyter Berlin/Boston.

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