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Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars

Geophysical Research Letters

By:
, , , ,
DOI: 10.1029/2008GL034385

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Abstract

Phyllosilicates have previously been detected in layered outcrops in and around the Martian outflow channel Mawrth Vallis. CRISM spectra of these outcrops exhibit features diagnostic of kaolinite, montmorillonite, and Fe/Mg-rich smectites, along with crystalline ferric oxide minerals such as hematite. These minerals occur in distinct stratigraphic horizons, implying changing environmental conditions and/or a variable sediment source for these layered deposits. Similar stratigraphic sequences occur on both sides of the outflow channel and on its floor, with Al-clay-bearing layers typically overlying Fe/Mg-clay-bearing layers. This pattern, combined with layer geometries measured using topographic data from HiRISE and HRSC, suggests that the Al-clay-bearing horizons at Mawrth Vallis postdate the outflow channel and may represent a later sedimentary or altered pyroclastic deposit that drapes the topography. Copyright 2008 by the American Geophysical Union.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars
Series title:
Geophysical Research Letters
DOI:
10.1029/2008GL034385
Volume
35
Issue:
12
Year Published:
2008
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article