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

Wray, J. J. and Ehlmann, B. L. and Squyres, S. W. and Mustard, J. F. and Kirk, R. L. (2008) Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars. Geophysical Research Letters, 35 (12). Art. No. L12202. ISSN 0094-8276. doi:10.1029/2008GL034385.

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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.

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Ehlmann, B. L.0000-0002-2745-3240
Additional Information:© 2008 American Geophysical Union. Received 22 April 2008; accepted 19 May 2008; published 21 June 2008. We thank M. Rosiek and A. Dumke for their efforts producing HiRISE and HRSC DEMs, respectively. C. Okubo provided helpful suggestions on DEM analysis. Comments from A.S. McEwen, R.E. Milliken, N.T. Bridges, E.Z. Noe Dobrea, B.J. Thomson, F. Poulet, and our reviewers improved the paper. JJW thanks the Fannie & John Hertz Foundation for support.
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
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Fannie & John Hertz FoundationUNSPECIFIED
Subject Keywords:Mars; stratigraphy; phyllosilicates
Issue or Number:12
Record Number:CaltechAUTHORS:20121016-080353290
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Official Citation: Wray, J. J., B. L. Ehlmann, S. W. Squyres, J. F. Mustard, and R. L. Kirk (2008), Compositional stratigraphy of clay-bearing layered deposits at Mawrth Vallis, Mars, Geophys. Res. Lett., 35, L12202, doi:10.1029/2008GL034385.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34909
Deposited By: Ruth Sustaita
Deposited On:16 Oct 2012 15:23
Last Modified:09 Nov 2021 23:11

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