Journal article
Askival: An altered feldspathic cumulate sample in Gale crater
Meteoritics & planetary science, Vol.58(1), pp.41-62
01/2023
DOI: 10.1111/maps.13933
Abstract
Askival is a light toned, coarsely crystalline float rock, which was identified near the base of Vera Rubin Ridge in Gale Crater. We have studied Askival, principally with the ChemCam instrument but also using APXS compositional data and MAHLI images. Askival and an earlier identified sample, Bindi, represent two rare examples of feldspathic cumulate float rocks in Gale crater with >65% relict plagioclase. Bindi appears unaltered whereas Askival shows textural and compositional signatures of silicification, along with alkali remobilization and hydration. Askival likely experienced multiple stages of alteration, occurring first through acidic hydrolysis of metal cations, followed by deposition of silica and possible phyllosilicates at low T and neutral-34 alkaline pH. Through LIBS compositional analyses and normative calculations, we suggest that an assemblage of Fe-Mg silicates including amphibole and pyroxene, Fe phases and possibly Mg-rich phyllosilicate are present. Thermodynamic modelling of the more pristine Bindi composition predicts that amphibole and feldspar are stable within an upper crustal setting. This is consistent with the presence of amphibole in the parent igneous rocks of Askival and suggests that the paucity of amphiboles in other known Martian samples reflects the lack of representative samples of the Martian crust rather than their absence on Mars.
Details
- Title: Subtitle
- Askival: An altered feldspathic cumulate sample in Gale crater
- Creators
- D Bowden - University of LeicesterJohn Bridges - University of LeicesterAgnès Cousin - Institut de Recherche en Astrophysique et Planétologie Université de Toulouse CNRS, CNES 31400 Toulouse FranceWilliam Rapin - Institut de Recherche en Astrophysique et Planétologie Université de Toulouse CNRS, CNES 31400 Toulouse FranceJ Semprich - The Open UniversityOlivier Gasnault - Institut de Recherche en Astrophysique et Planétologie Université de Toulouse CNRS, CNES 31400 Toulouse FranceOlivier Forni - Institut de Recherche en Astrophysique et Planétologie Université de Toulouse CNRS, CNES 31400 Toulouse FrancePatrick Gasda - Los Alamos National LaboratoryD Das - McGill UniversityV Payré - University of IowaV. Sautter - National Museum of Natural HistoryCandice Bedford - Lunar and Planetary InstituteRoger Wiens - Los Alamos National LaboratoryP. Pinet - Institut de Recherche en Astrophysique et Planétologie Université de Toulouse CNRS, CNES 31400 Toulouse FranceJens Frydenvang - University of Copenhagen
- Resource Type
- Journal article
- Publication Details
- Meteoritics & planetary science, Vol.58(1), pp.41-62
- DOI
- 10.1111/maps.13933
- ISSN
- 1086-9379
- eISSN
- 1945-5100
- Publisher
- Wiley
- Grant note
- DOI: 10.13039/100000104, name: National Aeronautics and Space Administration, award: NNH13ZDA018O, NNH15A35I; DOI: 10.13039/501100000271, name: Science and Technology Facilities Council; DOI: 10.13039/100014013, name: UK Research and Innovation; DOI: 10.13039/100011690, name: UK Space Agency; DOI: 10.13039/100018624, name: Universities Space Research Association
- Language
- English
- Electronic publication date
- 12/04/2022
- Date published
- 01/2023
- Academic Unit
- Earth and Environmental Sciences
- Record Identifier
- 9984345164902771
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