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Stratigraphic Architecture of Bedrock Reference Section, Victoria Crater, Meridiani Planum, Mars

Edgar, Lauren A. and Grotzinger, John P. and Hayes, Alex G. and Rubin, David M. and Squyres, Steve W. and Bell, James F. and Herkenhoff, Ken E. (2012) Stratigraphic Architecture of Bedrock Reference Section, Victoria Crater, Meridiani Planum, Mars. In: Sedimentary Geology of Mars. SEPM Special Publication. No.102. Society for Sedimentary Geology , Tulsa, OK, pp. 195-209. ISBN 9781565763135. https://resolver.caltech.edu/CaltechAUTHORS:20180710-140847199

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Abstract

The Mars Exploration Rover Opportunity has investigated bedrock outcrops exposed in several craters at Meridiani Planum, Mars, in an effort to better understand the role of surface processes in its geologic history. Opportunity has recently completed its observations of Victoria crater, which is 750 m in diameter and exposes cliffs up to ∼15 m high. The plains surrounding Victoria crater are ∼10 m higher in elevation than those surrounding the previously explored Endurance crater, indicating that the Victoria crater exposes a stratigraphically higher section than does the Endurance crater; however, Victoria strata overlap in elevation with the rocks exposed at the Erebus crater. Victoria crater has a well-developed geomorphic pattern of promontories and embayments that define the crater wall and that reveal thick bedsets (3–7 m) of large-scale cross-bedding, interpreted as fossil eolian dunes. Opportunity was able to drive into the crater at Duck Bay, located on the western margin of Victoria crater. Data from the Microscopic Imager and Panoramic Camera reveal details about the structures, textures, and depositional and diagenetic events that influenced the Victoria bedrock. A lithostratigraphic subdivision of bedrock units was enabled by the presence of a light-toned band that lines much of the upper rim of the crater. In ascending order, three stratigraphic units are named Lyell, Smith, and Steno; Smith is the light-toned band. In the Reference Section exposed along the ingress path at Duck Bay, Smith is interpreted to represent a zone of diagenetic recrystallization; however, its upper contact also coincides with a primary erosional surface. Elsewhere in the crater the diagenetic band crosscuts the physical stratigraphy. Correlation with strata present at nearby promontory Cape Verde indicates that there is an erosional surface at the base of the cliff face that corresponds to the erosional contact below Steno. The erosional contact at the base of Cape Verde lies at a lower elevation, but within the same plane as the contact below Steno, which indicates that the material above the erosional contact was built on significant depositional paleotopography. The eolian dune forms exposed in Duck Bay and Cape Verde, combined with the geometry of the erosional surface, indicate that these outcrops may be part of a larger-scale draa architecture. This insight is possible only as a result of the larger-scale exposures at Victoria crater, which significantly exceed the more limited exposures at the Erebus, Endurance, and Eagle craters.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
https://doi.org/10.2110/pec.12.102.0195DOIArticle
ORCID:
AuthorORCID
Edgar, Lauren A.0000-0001-7512-7813
Grotzinger, John P.0000-0001-9324-1257
Bell, James F.0000-0002-2006-4074
Herkenhoff, Ken E.0000-0002-3153-6663
Additional Information:© 2012 SEPM. Published: January 01, 2012.
Subject Keywords:Mars, eolian, cross-bedding, stratigraphy
Series Name:SEPM Special Publication
Issue or Number:102
Record Number:CaltechAUTHORS:20180710-140847199
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180710-140847199
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:87718
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Jul 2018 21:17
Last Modified:03 Oct 2019 19:59

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