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Title: Shocked chromites in fossil L chondrites: A Raman spectroscopy and transmission electron microscopy study

Abstract

Abstract Chromites from Middle Ordovician fossil L chondrites and from matrix and shock‐melt veins in Catherwood, Tenham, and Coorara L chondrites were studied using Raman spectroscopy and TEM . Raman spectra of chromites from fossil L chondrites showed similarities with chromites from matrix and shock‐melt veins in the studied L chondrite falls and finds. Chromites from shock‐melt veins of L chondrites show polycrystallinity, while the chromite grains in fossil L chondrites are single crystals. In addition, chromites from shock‐melt veins in the studied L chondrites have high densities of planar fractures within the subgrains and many subgrains show intergrowths of chromite and xieite. Matrix chromite of Tenham has similar dislocation densities and planar fractures as a chromite from the fossil meteorite Golvsten 001 and higher dislocation densities than in chromite from the fossil meteorite Sextummen 003. Using this observation and knowing that the matrix of Tenham experienced 20–22  GP a and <1000° C, an upper limit for the P,T conditions of chromite from Golvsten 001 and Sextummen 003 can be estimated to be 20–22  GP a and 1000° C (shock stage S3–S6) and 20  GP a and 1000° C (S3–S5), respectively, and we conclude that the studied fossil meteorite chromites are from matrix.

Authors:
 [1];  [2];  [3];  [4];  [5];  [5];  [6]
  1. Robert A. Pritzker Center for Meteoritics and Polar Studies The Field Museum of Natural History 1400 South Lake Shore Drive Chicago Illinois 60605 USA, Chicago Center for Cosmochemistry The University of Chicago 5734 South Ellis Avenue Chicago Illinois 60637 USA
  2. Robert A. Pritzker Center for Meteoritics and Polar Studies The Field Museum of Natural History 1400 South Lake Shore Drive Chicago Illinois 60605 USA, Chicago Center for Cosmochemistry The University of Chicago 5734 South Ellis Avenue Chicago Illinois 60637 USA, Department of the Geophysical Sciences The University of Chicago 5734 South Ellis Avenue Chicago Illinois 60637 USA
  3. Photon Science Division Argonne National Laboratory 9700 S. Cass Avenue Argonne Illinois 60439 USA
  4. Bayerisches Geoinstitut University of Bayreuth Universitätsstraβe 30 95447 Bayreuth Germany
  5. Electron and X‐ray Microscopy Center for Nanoscale Materials, Argonne National Laboratory 9700 S. Cass Avenue Argonne Illinois 60439 USA
  6. Robert A. Pritzker Center for Meteoritics and Polar Studies The Field Museum of Natural History 1400 South Lake Shore Drive Chicago Illinois 60605 USA, Astrogeobiology Laboratory Department of Physics Lund University SE 22100 Lund Sweden
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1379985
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Meteoritics and Planetary Science
Additional Journal Information:
Journal Name: Meteoritics and Planetary Science Journal Volume: 52 Journal Issue: 9; Journal ID: ISSN 1086-9379
Publisher:
Wiley-Blackwell
Country of Publication:
United States
Language:
English

Citation Formats

Rout, Surya S., Heck, Philipp R., Zaluzec, Nestor J., Ishii, Takayuki, Wen, Jianguo, Miller, Dean J., and Schmitz, Birger. Shocked chromites in fossil L chondrites: A Raman spectroscopy and transmission electron microscopy study. United States: N. p., 2017. Web. doi:10.1111/maps.12887.
Rout, Surya S., Heck, Philipp R., Zaluzec, Nestor J., Ishii, Takayuki, Wen, Jianguo, Miller, Dean J., & Schmitz, Birger. Shocked chromites in fossil L chondrites: A Raman spectroscopy and transmission electron microscopy study. United States. https://doi.org/10.1111/maps.12887
Rout, Surya S., Heck, Philipp R., Zaluzec, Nestor J., Ishii, Takayuki, Wen, Jianguo, Miller, Dean J., and Schmitz, Birger. Tue . "Shocked chromites in fossil L chondrites: A Raman spectroscopy and transmission electron microscopy study". United States. https://doi.org/10.1111/maps.12887.
@article{osti_1379985,
title = {Shocked chromites in fossil L chondrites: A Raman spectroscopy and transmission electron microscopy study},
author = {Rout, Surya S. and Heck, Philipp R. and Zaluzec, Nestor J. and Ishii, Takayuki and Wen, Jianguo and Miller, Dean J. and Schmitz, Birger},
abstractNote = {Abstract Chromites from Middle Ordovician fossil L chondrites and from matrix and shock‐melt veins in Catherwood, Tenham, and Coorara L chondrites were studied using Raman spectroscopy and TEM . Raman spectra of chromites from fossil L chondrites showed similarities with chromites from matrix and shock‐melt veins in the studied L chondrite falls and finds. Chromites from shock‐melt veins of L chondrites show polycrystallinity, while the chromite grains in fossil L chondrites are single crystals. In addition, chromites from shock‐melt veins in the studied L chondrites have high densities of planar fractures within the subgrains and many subgrains show intergrowths of chromite and xieite. Matrix chromite of Tenham has similar dislocation densities and planar fractures as a chromite from the fossil meteorite Golvsten 001 and higher dislocation densities than in chromite from the fossil meteorite Sextummen 003. Using this observation and knowing that the matrix of Tenham experienced 20–22  GP a and <1000° C, an upper limit for the P,T conditions of chromite from Golvsten 001 and Sextummen 003 can be estimated to be 20–22  GP a and 1000° C (shock stage S3–S6) and 20  GP a and 1000° C (S3–S5), respectively, and we conclude that the studied fossil meteorite chromites are from matrix.},
doi = {10.1111/maps.12887},
journal = {Meteoritics and Planetary Science},
number = 9,
volume = 52,
place = {United States},
year = {Tue May 02 00:00:00 EDT 2017},
month = {Tue May 02 00:00:00 EDT 2017}
}

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https://doi.org/10.1111/maps.12887

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