Diagenetic silica enrichment and late-stage groundwater activity in Gale crater, Mars

Geophysical Research Letters
By: , and 

Links

Abstract

Diagenetic silica enrichment in fracture-associated halos that crosscut lacustrine and unconformably overlying aeolian sedimentary bedrock is observed on the lower north slope of Aeolis Mons in Gale crater, Mars. The diagenetic silica enrichment is colocated with detrital silica enrichment observed in the lacustrine bedrock yet extends into a considerably younger, unconformably draping aeolian sandstone, implying that diagenetic silica enrichment postdates the detrital silica enrichment. A causal connection between the detrital and diagenetic silica enrichment implies that water was present in the subsurface of Gale crater long after deposition of the lacustrine sediments and that it mobilized detrital amorphous silica and precipitated it along fractures in the overlying bedrock. Although absolute timing is uncertain, the observed diagenesis likely represents some of the most recent groundwater activity in Gale crater and suggests that the timescale of potential habitability extended considerably beyond the time that the lacustrine sediments of Aeolis Mons were deposited.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Diagenetic silica enrichment and late-stage groundwater activity in Gale crater, Mars
Series title Geophysical Research Letters
DOI 10.1002/2017GL073323
Volume 44
Issue 10
Year Published 2017
Language English
Publisher American Geophysical Union
Contributing office(s) Astrogeology Science Center
Description 9 p.
First page 4716
Last page 4724