Consolidated Chemical Provinces on Mars: Implications for Geologic Interpretations

Autor: Rani, A., Basu Sarbadhikari, A., Hood, D., Gasnault, O., Nambiar, S., Karunatillake, S.
Přispěvatelé: Indian Institute of Technology [Gandhinagar] ( IIT Gandhinagar ), Physical Research Laboratory [Ahmedabad] (PRL), Indian Space Research Organisation (ISRO), Baylor University, 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), Louisiana State University (LSU)
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Geophysical Research Letters
Geophysical Research Letters, 2022, 49 (14), pp.e2022GL099235. ⟨10.1029/2022GL099235⟩
ISSN: 0094-8276
1944-8007
DOI: 10.1029/2022GL099235⟩
Popis: International audience; Chemical provinces were defined on Mars a decade ago using orbital nuclear spectroscopy of K, Th, Fe, Si, Ca, Cl, and H2O. However, past multivariate analyses yielded three sets of provinces, suggesting methodologic variability. Province-stability to the inclusion of Al and S is also unknown, presenting additional uncertainties for geologic insight. Here we consolidate key multivariate methods to define the first cross-validated provinces. In southern highlands, the highly incompatible K and Th show non-uniform distribution with higher values in mid Noachian and Hesperian than late Noachian – early Hesperian volcanic terrains. Silica- and Al-depletion trends from Noachian to Amazonian indicate highly differentiated mantle with variable degree of melting. Late Hesperian lowlands are highly depleted in Al and enriched in K and Th, consistent with volcanic resurfacing from a low-degree partially melted, garnet-rich mantle. Furthermore, older volatile-rich regions such as Medusae Fossae Formation exhibit igneous geochemistry, consistent with water-limited isochemical weathering throughout Mars's history.
Databáze: OpenAIRE
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