Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars
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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.
| 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 |
| Publication Date | June 21, 2008 |
| Year Published | 2008 |
| Language | English |
| Publisher | American Geophysical Union |
| Publisher location | Washington, D.C. |
| Contributing office(s) | Astrogeology Science Center |
| Description | 6 p. |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geophysical Research Letters |
| Other Geospatial | Mars; Mawrth Vallis |