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

Autor: S. Alwmark, B. Horgan, A. Udry, A. Bechtold, S. Fagents, E. Ravanis, L. Crumpler, N. Schmitz, E. Cloutis, A. Brown, D. Flannery, O. Gasnault, J. Grotzinger, S. Gupta, L. Kah, P. Kelemen, K. Kinch, J. Núñez
Přispěvatelé: Lund University [Lund], IT University of Copenhagen (ITU), Purdue University [West Lafayette], University of Nevada [Las Vegas] (WGU Nevada), University of Vienna [Vienna], Austrian Academy of Sciences (OeAW), University of Hawai‘i [Mānoa] (UHM), New Mexico Museum of Natural History and Science (NMMNHS), DLR Institute of Planetary Research, German Aerospace Center (DLR), Department of Geography [Winnipeg], University of Winnipeg, Queensland University of Technology [Brisbane] (QUT), Institut de recherche en astrophysique et planétologie (IRAP), Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS), Christian-Albrechts-Universität zu Kiel (CAU), Department of Earth Science and Technology [Imperial College London], Imperial College London, The University of Tennessee [Knoxville], Lamont-Doherty Earth Observatory (LDEO), Columbia University [New York], Department of Earth and Environmental Sciences [New York], University of Copenhagen = Københavns Universitet (UCPH), Johns Hopkins University Applied Physics Laboratory [Laurel, MD] (APL)
Jazyk: angličtina
Rok vydání: 2023
Předmět:
Zdroj: Journal of Geophysical Research. Planets
Journal of Geophysical Research. Planets, In press, The MARS Perseverance Rover Jezero Crater Floor Campaign, pp.e2022JE007446. ⟨10.1029/2022JE007446⟩
ISSN: 2169-9097
2169-9100
DOI: 10.1029/2022JE007446⟩
Popis: International audience; 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.
Databáze: OpenAIRE
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