Ancient hot springs on Mars: Origins and paleoenvironmental significance of small Martian valleys

G. Robert Brakenridge, Horton E. Newsom, Victor R. Baker

Research output: Contribution to journalArticle

100 Scopus citations

Abstract

At least two classes of small valleys (subparallel slope ravines and flat-floored branching valleys) shown on Viking imagery of Mars exhibit spatial relationships to impact structures. Cessation of their formation at the terminus of the heavy bombardment period, about 3.8 Ga, also implies a causal relationship between valley formation and cratering. We hypothesize that these valley types originated through the interaction of ground ice and hot springs located along the permeable fringes of slowly cooling impact melts. The valleys grew by a combination of headward sapping and down-valley water and ice fluid flow. The probable widespread operation of impact-related hydrothermal systems early in Mars history indicates that it is not necessary to infer atmospheric changes to explain valley origin.

Original languageEnglish (US)
Pages (from-to)859-862
Number of pages4
JournalGeology
Volume13
Issue number12
DOIs
StatePublished - 1985

ASJC Scopus subject areas

  • Geology

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