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Diverse Lava Flow Morphologies in the Stratigraphy of the Jezero Crater Floor

Alwmark, S. and Horgan, B and Udry, A. and Bechtold, A. and Fagents, S. and Ravanis, E.M. and Crumpler, L. and Schmitz, Nicole and Cloutis, E. and Brown, A. and Flannery, D. and Gasnault, O. and Grotzinger, J P and Gupta, Sanjeev and Kah, L. and Kelemen, P. and Kinch, K. and Núñez, J. (2023) Diverse Lava Flow Morphologies in the Stratigraphy of the Jezero Crater Floor. Journal of Geophysical Research: Planets. Wiley. doi: 10.1029/2022JE007446. ISSN 2169-9097.

[img] PDF - Postprint version (accepted manuscript)

Official URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JE007446


We present a combined geomorphologic, multispectral, and geochemical analysis of crater floor rocks in Jezero crater based on data obtained by the Mastcam-Z and SuperCam instruments onboard the NASA Mars 2020 Perseverance rover. The combined data from this analysis together with the results of a comparative study with geologic sites on Earth allows us to interpret the origins of rocks exposed along the Artuby ridge, a ∼900 m long scarp of lower Máaz formation rocks. The ridge exposes rocks belonging to two morphologically distinct members, Artuby and Rochette, that both have basaltic composition and are spectrally indistinguishable in our analysis. Artuby rocks consist of morphologically distinct units that alternate over the ridge, bulbous, hummocky, layers with varying thicknesses that in places appear to have flowed over underlying strata, and sub-planar thinner laterally continuous layers with variable friability. The Rochette member has a massive appearance with pronounced pitting and sub-horizontal partings. Our findings are most consistent with a primary igneous emplacement as lava flows, through multiple eruptions, and we propose that the thin layers result either from preferential weathering, interbedded ash/tephra layers, ʻaʻā clinker layers, or aeolian deposition. Our analyses provide essential geologic context for the Máaz formation samples that will be returned to Earth and highlight the diversity and complexity of geologic processes on Mars not visible from orbit.

Item URL in elib:https://elib.dlr.de/195932/
Document Type:Article
Title:Diverse Lava Flow Morphologies in the Stratigraphy of the Jezero Crater Floor
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Alwmark, S.Department of Geology, Lund University, Lund, Sweden; Niels Bohr Institute Copenhagen DenmarkUNSPECIFIEDUNSPECIFIED
Horgan, BDepartment of Earth, Atmospheric, and Planetary Sciences, Purdue University, West Lafayette, IN, USAhttps://orcid.org/0000-0001-6314-9724UNSPECIFIED
Udry, A.UNSPECIFIEDhttps://orcid.org/0000-0002-0074-8110UNSPECIFIED
Bechtold, A.UNSPECIFIEDhttps://orcid.org/0000-0001-7018-1685UNSPECIFIED
Fagents, S.UNSPECIFIEDhttps://orcid.org/0000-0002-3943-3335UNSPECIFIED
Ravanis, E.M.Hawai’i Institute of Geophysics and Planetology, University of HawaiiUNSPECIFIEDUNSPECIFIED
Crumpler, L.UNSPECIFIEDhttps://orcid.org/0000-0002-5941-6372UNSPECIFIED
Schmitz, NicoleUNSPECIFIEDhttps://orcid.org/0000-0001-6481-6189UNSPECIFIED
Cloutis, E.UNSPECIFIEDhttps://orcid.org/0000-0001-7301-0929UNSPECIFIED
Brown, A.UNSPECIFIEDhttps://orcid.org/0000-0002-9352-6989UNSPECIFIED
Flannery, D.UNSPECIFIEDhttps://orcid.org/0000-0001-8982-496XUNSPECIFIED
Gasnault, O.UNSPECIFIEDhttps://orcid.org/0000-0002-6979-9012UNSPECIFIED
Grotzinger, J PDivision of Geologic and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA.UNSPECIFIEDUNSPECIFIED
Gupta, SanjeevEarth Science and Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, United KingdomUNSPECIFIEDUNSPECIFIED
Kah, L.UNSPECIFIEDhttps://orcid.org/0000-0001-7172-2033UNSPECIFIED
Kelemen, P.UNSPECIFIEDhttps://orcid.org/0000-0003-4757-0855UNSPECIFIED
Kinch, K.UNSPECIFIEDhttps://orcid.org/0000-0002-4629-8880UNSPECIFIED
Núñez, J.UNSPECIFIEDhttps://orcid.org/0000-0003-0930-6674UNSPECIFIED
Date:30 January 2023
Journal or Publication Title:Journal of Geophysical Research: Planets
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Keywords:Mars2020 Perseverance Geology Geomorphology stratigraphy Jezero crater
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):R - Project ExoMars PanCam / MARS2020
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Schmitz, Nicole
Deposited On:11 Jul 2023 14:46
Last Modified:11 Jul 2023 14:46

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