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Title: Shock-transformation of whitlockite to merrillite and the implications for meteoritic phosphate

Abstract

Meteorites represent the only samples available for study on Earth of a number of planetary bodies. The minerals within meteorites therefore hold the key to addressing numerous questions about our solar system. Of particular interest is the Ca-phosphate mineral merrillite, the anhydrous end-member of the merrillite-whitlockite solid solution series. For example, the anhydrous nature of merrillite in Martian meteorites has been interpreted as evidence of water-limited late-stage Martian melts. However, recent research on apatite in the same meteorites suggests higher water content in melts. One complication of using meteorites rather than direct samples is the shock compression all meteorites have experienced, which can alter meteorite mineralogy. Here we show whitlockite transformation into merrillite by shock-compression levels relevant to meteorites, including Martian meteorites. The results open the possibility that at least part of meteoritic merrillite may have originally been H + -bearing whitlockite with implications for interpreting meteorites and the need for future sample return.

Authors:
 [1];  [2];  [1];  [1];  [3];  [4];  [1];  [5];  [5];  [6];  [7]
  1. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Geoscience
  2. Univ. of Nevada, Las Vegas, NV (United States). Dept. of Geoscience, High Pressure Science and Engineering Center, Galilee Inst.; Southwest Jiaotong Univ., Chengdu (China). Key Lab. of Advanced Technologies of Materials
  3. Southwest Jiaotong Univ., Chengdu (China). Key Lab. of Advanced Technologies of Materials; The Peace Inst. of Multiscale Sciences, Chengdu (China)
  4. The Peace Inst. of Multiscale Sciences, Chengdu (China); Univ. of Science and Technology of China, Hefei (China). Dept. of Modern Mechanics
  5. Univ. of Chicago, IL (United States). GeoScienceEnviro Center for Advanced Radiation Sources
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source
  7. Carnegie Inst. of Washington, Argonne, IL (United States). High Pressure Collaborative Access Team (HPCAT)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1379764
Grant/Contract Number:  
AC02-05CH11231; NA0001982; FG02-94ER14466; FG02-99ER45775; AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 8; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; geochemistry; meteoritics; petrology

Citation Formats

Adcock, C. T., Tschauner, O., Hausrath, E. M., Udry, A., Luo, S. N., Cai, Y., Ren, M., Lanzirotti, A., Newville, M., Kunz, M., and Lin, C.. Shock-transformation of whitlockite to merrillite and the implications for meteoritic phosphate. United States: N. p., 2017. Web. doi:10.1038/ncomms14667.
Adcock, C. T., Tschauner, O., Hausrath, E. M., Udry, A., Luo, S. N., Cai, Y., Ren, M., Lanzirotti, A., Newville, M., Kunz, M., & Lin, C.. Shock-transformation of whitlockite to merrillite and the implications for meteoritic phosphate. United States. doi:10.1038/ncomms14667.
Adcock, C. T., Tschauner, O., Hausrath, E. M., Udry, A., Luo, S. N., Cai, Y., Ren, M., Lanzirotti, A., Newville, M., Kunz, M., and Lin, C.. Mon . "Shock-transformation of whitlockite to merrillite and the implications for meteoritic phosphate". United States. doi:10.1038/ncomms14667. https://www.osti.gov/servlets/purl/1379764.
@article{osti_1379764,
title = {Shock-transformation of whitlockite to merrillite and the implications for meteoritic phosphate},
author = {Adcock, C. T. and Tschauner, O. and Hausrath, E. M. and Udry, A. and Luo, S. N. and Cai, Y. and Ren, M. and Lanzirotti, A. and Newville, M. and Kunz, M. and Lin, C.},
abstractNote = {Meteorites represent the only samples available for study on Earth of a number of planetary bodies. The minerals within meteorites therefore hold the key to addressing numerous questions about our solar system. Of particular interest is the Ca-phosphate mineral merrillite, the anhydrous end-member of the merrillite-whitlockite solid solution series. For example, the anhydrous nature of merrillite in Martian meteorites has been interpreted as evidence of water-limited late-stage Martian melts. However, recent research on apatite in the same meteorites suggests higher water content in melts. One complication of using meteorites rather than direct samples is the shock compression all meteorites have experienced, which can alter meteorite mineralogy. Here we show whitlockite transformation into merrillite by shock-compression levels relevant to meteorites, including Martian meteorites. The results open the possibility that at least part of meteoritic merrillite may have originally been H + -bearing whitlockite with implications for interpreting meteorites and the need for future sample return.},
doi = {10.1038/ncomms14667},
journal = {Nature Communications},
number = ,
volume = 8,
place = {United States},
year = {Mon Mar 06 00:00:00 EST 2017},
month = {Mon Mar 06 00:00:00 EST 2017}
}

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