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Shock experiments on basalt—Ferric sulfate mixes and their possible relevance to the sulfide bleb clusters in large impact melts in shergottites

Rao, M. N. and Nyquist, L. E. and Asimow, P. D. and Ross, D. K. and Sutton, S. R. and See, T. H. and Shih, C. Y. and Garrison, D. H. and Wentworth, S. J. and Park, J. (2021) Shock experiments on basalt—Ferric sulfate mixes and their possible relevance to the sulfide bleb clusters in large impact melts in shergottites. Meteoritics and Planetary Science . ISSN 1086-9379. doi:10.1111/maps.13770. https://resolver.caltech.edu/CaltechAUTHORS:20211209-456542000

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Abstract

Large impact-melt pockets in shergottites contain both Martian regolith components and sulfide/sulfite bleb clusters that yield high sulfur concentrations locally compared to bulk shergottites. The regolith may be the source of excess sulfur in the shergottite melt pockets. To explore whether shock and release of secondary Fe-sulfates trapped in host rock voids is a plausible mechanism to generate the shergottite sulfur bleb clusters, we carried out shock recovery experiments on an analog mixture of ferric sulfate and Columbia River basalt at peak pressures of 21 and 31 GPa. The recovered products from the 31 GPa experiment show mixtures of Fe-sulfide and Fe-sulfite blebs similar to the sulfur-rich bleb clusters found in shergottite impact melts. The 21 GPa experiment did not yield such blebs. The collapse of porosity and local high-strain shear heating in the 31 GPa experiment presumably created high-temperature hotspots (~2000 °C) sufficient to reduce Fe³⁺ to Fe²⁺ and to decompose sulfate to sulfite, followed by concomitant reduction to sulfide during pressure release. Our results suggest that similar processes might have transpired during shock production of sulfur-rich bleb clusters in shergottite impact melts. It is possible that very small CO presence in our experiments could have catalyzed the reduction process. We plan to repeat the experiments without CO.


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ORCID:
AuthorORCID
Rao, M. N.0000-0002-0745-2531
Asimow, P. D.0000-0001-6025-8925
Sutton, S. R.0000-0002-5362-6280
Additional Information:© 2021 The Meteoritical Society. Version of Record online: 09 December 2021. Manuscript accepted: 04 November 2021. Manuscript received: 29 July 2020. This paper is dedicated to the memory of Kent Ross, major contributor to this work, who passed away in July 2021. We thank Don Bogard, Fred Hörz, Mark Cintala, Abhijit Basu, and Jay Melosh for valuable discussions on different aspects related to this work. We thank Frank Cardenaes and Roland Montes for carrying out 21 GPa shock experiment at EIL, Johnson Space Center (under the supervision of Mark Cintala). We thank Michael Long for carrying out the 31 GPa experiment at the shock wave lab at Caltech which is supported by the NSF awards 1829277 and 1725349 to Paul Asimow. We thank Joachim Huth for FE SEM measurements on our PTS samples at Max-Planck Institute fur Chemie, Mainz (Germany). This work is partly supported by NASA MFRP grant No. 08-0069 to Larry Nyquist at JSC. We thank Anita Rao of Qualcomm (San Diego, CA) for valuable computational assistance during this work. MNR is grateful to Alexander von Humboldt Stiftung (Germany) for partially supporting his presentation of the preliminary results obtained in this study at METSOC Meeting in Berlin in 2016. We are grateful to the Editor, Timothy Jull and the Associate Editor, Natalia Artemieva for efficient handling of our manuscript and to reviewers Christopher Hamann and Vincent Chevrier for valuable comments and suggestions that led to a significant improvement of the paper.
Funders:
Funding AgencyGrant Number
NSFEAR-1829277
NSFEAR-1725349
NASA08-0069
DOI:10.1111/maps.13770
Record Number:CaltechAUTHORS:20211209-456542000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20211209-456542000
Official Citation:Rao, M.N., Nyquist, L.E., Asimow, P.D., Ross, D.K., Sutton, S.R., See, T.H., Shih, C.Y., Garrison, D.H., Wentworth, S.J. and Park, J. (2021), Shock experiments on basalt—Ferric sulfate mixes and their possible relevance to the sulfide bleb clusters in large impact melts in shergottites. Meteorit Planet Sci. https://doi.org/10.1111/maps.13770
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:112332
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:10 Dec 2021 20:11
Last Modified:10 Dec 2021 21:11

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