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Quantitative determination of the shock stage of L6 ordinary chondrites using X-ray diffraction

  • Naoya Imae ORCID logo and Makoto Kimura
Published/Copyright: September 4, 2021
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American Mineralogist
From the journal American Mineralogist Volume 106 Issue 9

Abstract

The shock stages of 14 L6 ordinary chondrites are estimated using the random X‑ray diffraction patterns of polished thin section samples and the in-plane rotation method. The mean lattice strains and grain size factors for olivine and orthopyroxene are determined from the analyses based on the Williamson–Hall plots, which depict the tangent Bragg angle and integral breadth β. The lattice strain in olivine, εOl, is distributed from ~0.05% to ~0.25%, while that in orthopyroxene, εOpx, is distributed from ~0.1 to ~0.4%, where we selected the isolated peaks of olivine and orthopyroxene. The olivine peaks have Miller indices of (130), (211), (222), and (322), while the orthopyroxene peaks have Miller indices of (610), (511), (421), (631), and (12.1.2). The intercept for integral breadth β 0 O1  and β 0 O p x for the Williamson–Hall plots correlates with the grain size of the constituent minerals. The grain size is proportional to the inverse of β0 since the β intercept increases with the shock stage. Introducing a new parameter, –ε/log β0 for olivine (0.04–0.16) and orthopyroxene (0.07–0.32) reveals a clear relationship between them: –εOpx/log β 0 O p x = –0.01+ 2.0 − ε 01 / log ⁡ β 0 O 1 (R > 0.9). In addition, the isolated peak of plagioclase (2̅01) systematically changes as the shock stage increases, suggesting the progress of amorphization (maskelynitization). Another parameter, (I/FWHM)Pl(2̅01) reveals additional relationships: − ε O l / log ⁡ β 0 O l = 0.14(±0.01) − 5.2 × 10−5 (±5.7 × 10−6) × (I/FWHM)Pl(2̅01), and − ε O p x / log ⁡ β 0 O p x = 0.25(±0.04) − 8.9 × 10−5 (±2.6 × 10−5) × 10–5 × (I/FWHM)Pl(2̅01). These three parameters systematically change with the shock stage, suggesting that they are suitable shock barometers. The present method is useful to evaluate the shock stage of L6 chondrites and potentially enables quantitative shock stage classification for stony meteorites.

Keywords: Olivine; orthopyroxene; ordinary chondrites; X‑ray diffraction; lattice strain; shock metamorphism

Funding statement: The study is partly supported by KAKENHI 17K05721 and NIPR Research Project KP-307. The polished thin sections of the Antarctic meteorites and Tenham were on loan from NIPR.

Acknowledgments and Funding

We are grateful to Anner Peslier, Associate Editor, for the handling of our manuscript and the constructive review, and Roberta L. Flemming, Jörg Fritz, and Jacob A. Tielke for their constructive and thoughtful reviews. We are grateful to Yoshihiro Nakamuta, Naotaka Tomioka, Masahiro Yasutake, and Rei Kanemaru for the discussions and to Sen Hu for supplying and permission to use of the Mangui L6 chondrite fell in 1 June 2018 on Yunnan, China.

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Received: 2020-04-09
Accepted: 2020-10-24
Published Online: 2021-09-04
Published in Print: 2021-09-27

© 2021 Mineralogical Society of America

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  3. Cr2O3 in corundum: Ultrahigh contents under reducing conditions
  4. Plagioclase population dynamics and zoning in response to changes in temperature and pressure
  5. Limited channelized fluid infiltration in the Torres del Paine contact aureole
  6. Quantitative determination of the shock stage of L6 ordinary chondrites using X-ray diffraction
  7. A new method to rapidly and accurately assess the mechanical properties of geologically relevant materials
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  13. Controls on tetrahedral Fe(III) abundance in 2:1 phyllosilicates—Discussion
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  15. New Mineral Names*
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https://doi.org/10.2138/am-2021-7554
Keywords for this article
Olivine; orthopyroxene; ordinary chondrites; X‑ray diffraction; lattice strain; shock metamorphism

Articles in the same Issue

  1. Stable and transient isotopic trends in the crustal evolution of Zealandia Cordillera
  2. An evolutionary system of mineralogy, Part V: Aqueous and thermal alteration of planetesimals (~4565 to 4550 Ma)
  3. Cr2O3 in corundum: Ultrahigh contents under reducing conditions
  4. Plagioclase population dynamics and zoning in response to changes in temperature and pressure
  5. Limited channelized fluid infiltration in the Torres del Paine contact aureole
  6. Quantitative determination of the shock stage of L6 ordinary chondrites using X-ray diffraction
  7. A new method to rapidly and accurately assess the mechanical properties of geologically relevant materials
  8. Two-stage magmatism and tungsten mineralization in the Nanling Range, South China: Evidence from the Jurassic Helukou deposit
  9. Constraints on scheelite genesis at the Dabaoshan stratabound polymetallic deposit, South China
  10. Crystal chemistry of schreibersite, (Fe,Ni)3P
  11. Letter
  12. Elastic geobarometry: How to work with residual inclusion strains and pressures
  13. Controls on tetrahedral Fe(III) abundance in 2:1 phyllosilicates—Discussion
  14. Controls on tetrahedral Fe(III) abundance in 2:1 phyllosilicates—Reply
  15. New Mineral Names*
  16. Book Review
  17. Book Review: Geochronology and Thermochronology
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