Megashears and hydrothermalism at the Martian crustal dichotomy in Valles Marineris - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Communications Earth & Environment Année : 2022

Megashears and hydrothermalism at the Martian crustal dichotomy in Valles Marineris

, , , (1) , (2)
1
2
Joanna Gurgurewicz
Daniel Mège
Frédéric Schmidt

Résumé

Abstract Observations of ancient deep deformation systems on Mars are important for constraining planetary dynamics, as well as to identify potential mineral resources. However, such systems were thought to be unexposed and inaccessible to analysis. Here, we apply structural and hyperspectral analyses, and correlate results with magnetic anomaly patterns, to investigate two large right-lateral brittle-ductile shear zones and fault megabreccia exposed in the deepest parts of Valles Marineris. The shear zones follow the trace of the edge of the Borealis impact basin, thought to represent the planetary dichotomy boundary. We identify hydrothermally altered mafic igneous rocks in the sheared basement. We suggest that the shear system was initiated as basin ring fault system in the pre-Noachian, with further reactivation up until the Hesperian, and may still be a potential source of marsquakes. Hydrothermal circulation through the shear zones may have initiated primary mineralizations which are promising for base and rare metal exploration.
Fichier principal
Vignette du fichier
s43247-022-00612-5.pdf (12.21 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03877260 , version 1 (29-11-2022)

Licence

Paternité - CC BY 4.0

Identifiants

Citer

Joanna Gurgurewicz, Daniel Mège, Frédéric Schmidt, S. Douté, Benoit Langlais. Megashears and hydrothermalism at the Martian crustal dichotomy in Valles Marineris. Communications Earth & Environment, 2022, 3 (1), pp.282. ⟨10.1038/s43247-022-00612-5⟩. ⟨hal-03877260⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook Twitter LinkedIn More