High pressure minerals in the Château-Renard (L6) ordinary chondrite: implications for collisions on its parent body

Creators: Baziotis, Ioannis; Asimow, Paul D.; Hu, Jinping; Ferrière, Ludovic; Ma, Chi; Černok, Ana; Anand, Mahesh; Topa, Dan

Abstract

We report the first discoveries of high-pressure minerals in the historical L6 chondrite fall Château-Renard, based on co-located Raman spectroscopy, scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy and electron backscatter diffraction, electron microprobe analysis, and transmission electron microscopy (TEM) with selected-area electron diffraction. A single polished section contains a network of melt veins from ~40 to ~200 μm wide, with no cross-cutting features requiring multiple vein generations. We find high-pressure minerals in veins greater than ~50 μm wide, including assemblages of ringwoodite + wadsleyite, ringwoodite + wadsleyite + majorite-pyrope_(ss), and ahrensite + wadsleyite. In association with ahrensite + wadsleyite at both SEM and TEM scale, we find a sodic pyroxene whose Raman spectrum is indistinguishable from that of jadeite but whose composition and structure are those of omphacite. We discuss constraints on the impact record of this meteorite and the L-chondrites in general.

Additional Information

© 2018 the Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Received 15 November 2017. Accepted 19 June 2018. Published 29 June 2018. This research received support from SYNTHESYS (www.synthesys.info) [AT-TAF-4526], a European Union-funded Integrated Activities grant. JH was supported by the Caltech-JPL President and Director's Fund. A.C. acknowledges funding received from the European Union's Horizon 2020 research and innovation programme under grant agreement No -704696 RESOLVE. M.A. acknowledges funding by the UK Science and Technology Facilities Council (ST/L000776/1 & ST/P000657/1). F. Brandstaetter is kindly acknowledged for fruitful discussions during the stay of I.B. in Vienna. I.B. greatfully acknowledges the National Hellenic Research Foundation and E. Kamitsos for access to Raman facilities. Author Contributions: I.B., P.D.A., J.H., C.M., L.F. designed this research. L.F. curated and loaned to I.B. the meteorite sections. I.B., P.D.A., J.H., C.M., A.C., L.F., M.A. and D.T. observed and analysed the meteorite sections. I.B., with help from J.H. and P.D.A., constructed the thermal and transformation time modeling. All authors reviewed the manuscript. Data Availability: The datasets generated during and/or analysed during the current study are included in this published article (and its Supplementary Information files) but also are available from the corresponding author on reasonable request. The authors declare no competing interests.

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