Intense alteration on early Mars revealed by high-aluminum rocks at Jezero crater - Université de Lyon
Journal Articles Communications Earth & Environment Year : 2024

Intense alteration on early Mars revealed by high-aluminum rocks at Jezero crater

B. S. Kathir
E. M. Hausrath
A. Udry
E. Cloutis
T. S. Gabriel
L. Mayhew
J. Simon
U. Wolf
K. M. Stack

Abstract

The NASA Perseverance rover discovered light-toned float rocks scattered across the surface of Jezero crater that are particularly rich in alumina ( ~ 35 wt% Al2O3) and depleted in other major elements (except silica). These unique float rocks have heterogeneous mineralogy ranging from kaolinite/halloysite-bearing in hydrated samples, to spinel-bearing in dehydrated samples also containing a dehydrated Al-rich phase. Here we describe SuperCam and Mastcam-Z observations of the float rocks, including the first in situ identification of kaolinite or halloysite on another planet, and dehydrated phases including spinel and apparent partially dehydroxylated kaolinite. The presence of spinel in these samples is likely detrital in origin, surviving kaolinitization, pointing to an ultramafic origin. However, the association of low hydration with increased Al2O3 abundances suggests heating- induced dehydration which could have occurred during the lithification or impact excavation of these rocks. Given the orbital context of kaolinite-bearing megabreccia in the Jezero crater rim, we propose an origin for these rocks involving intense aqueous alteration of the parent material, followed by dehydration/lithification potentially through impact processes, and dispersion into Jezero crater through flood or impact-related processes.
Fichier principal
Vignette du fichier
s43247-024-01837-2.pdf (18.94 Mo) Télécharger le fichier
Origin Publisher files allowed on an open archive
Licence

Dates and versions

insu-04776588 , version 1 (11-11-2024)

Licence

Identifiers

Cite

Clément Royer, C. C. Bedford, J. R. Johnson, B. H. N. Horgan, A. Broz, et al.. Intense alteration on early Mars revealed by high-aluminum rocks at Jezero crater. Communications Earth & Environment, 2024, 5 (1), pp.671. ⟨10.1038/s43247-024-01837-2⟩. ⟨insu-04776588⟩
0 View
0 Download

Altmetric

Share

More