Copper enrichments in the Kimberley formation in Gale crater, Mars: Evidence for a Cu deposit at the source - Université d'Angers Accéder directement au contenu
Article Dans Une Revue Icarus Année : 2019

Copper enrichments in the Kimberley formation in Gale crater, Mars: Evidence for a Cu deposit at the source

Cécile Fabre
Violaine Sautter
Laetitia Le Deit
Roger Wiens
Jérémie Lasue
  • Fonction : Auteur
Nina Lanza

Résumé

Copper quantification with laser induced breakdown spectroscopy (LIBS) using a univariate calibration model enables the ChemCam instrument onboard the Curiosity rover to measure unusually elevated Cu concentrations in potassic sandstones and Mn-oxide-bearing fracture fills in the Kimberley region of Gale crater, Mars. Mostly, the copper phases occurring in sedimentary bedrock are associated with detrital silicates, including feldspars, pyroxenes and K-phyllosilicates, likely coming from a potassic igneous source near the northern crater rim, while those present in the fractures are likely adsorbed on the surface of manganese oxides. These two different mineralogical associations imply at least two distinct processes: Cu enrichment in bedrock at the source, likely during crystallization of the igneous silicates, and adsorption of Cu on Mn-oxides precipitated from groundwater that encountered oxidizing conditions within fractures in the bedrock. The potassic sediments enriched in copper may be evidence of a porphyry copper deposit or an impact-induced hydrothermal deposit in the source region.

Domaines

Planétologie
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Dates et versions

hal-02104588 , version 1 (19-04-2019)

Identifiants

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Valérie Payré, Cécile Fabre, Violaine Sautter, Agnès Cousin, Nicolas Mangold, et al.. Copper enrichments in the Kimberley formation in Gale crater, Mars: Evidence for a Cu deposit at the source. Icarus, 2019, 321, pp.736-751. ⟨10.1016/j.icarus.2018.12.015⟩. ⟨hal-02104588⟩
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