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Multiple surface wetting events in the greater Meridiani Planum region, Mars: Evidence from valley networks within ancient cratered highlands
Author(s) -
Williams R. M. E.,
Chuang F. C.,
Berman D. C.
Publication year - 2017
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl072259
Subject(s) - geology , landform , mars exploration program , fluvial , martian , impact crater , evaporite , groundwater , earth science , river terraces , geomorphology , paleontology , physical geography , astrobiology , geography , sedimentary rock , structural basin , physics , geotechnical engineering
Morphological characterization of valley networks in three exposures of ancient cratered highlands (N hc1 ) in the greater Meridiani Planum region yields insight into the Martian aqueous history. From our mapping, key regional differences are apparent in fine‐scale valley network attributes including morphologic type, planimetric form, density, and links to candidate paleolakes. This information, combined with crater retention age (inferred exposure age), provides new details on the relative timing and nature of aqueous processes in the region. Newly identified pitted‐type valley networks have morphological similarity to terrestrial pitted landforms in an evaporite setting. We interpret the pitted valley networks to reflect late‐stage groundwater processes concentrated along the former fluvial conduits. Evidence from this study indicates that localized reactivation of valley networks occurred during or after exhumation of eastern N hc1 unit.