Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 14, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2022GL099235
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Funding
- Indian Space Research Organization
- Centre National d'Etudes Spatiales
- NASA MDAP [80NSSC18K1375]
- Baylor Office of the Vice Provost of Research Postdoctoral Program
- Indian Institute of Technology Gandhinagar
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Chemical provinces on Mars were defined using orbital nuclear spectroscopy, but past multivariate analyses showed methodological variability. The southern highlands exhibit non-uniform distribution of K and Th, with higher values in mid Noachian and Hesperian volcanic terrains. Trends of silica- and Al-depletion from Noachian to Amazonian suggest a highly differentiated mantle.
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.
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