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Late Amazonian glaciation at the dichotomy boundary on Mars: Evidence for glacial thickness maxima and multiple glacial phases

Dickson, James L. and Head, James W. and Marchant, David R. (2008) Late Amazonian glaciation at the dichotomy boundary on Mars: Evidence for glacial thickness maxima and multiple glacial phases. Geology, 36 (5). pp. 411-414. ISSN 0091-7613. https://resolver.caltech.edu/CaltechAUTHORS:20161129-105206763

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Abstract

Lineated valley fill (LVF) in fretted valleys at the dichotomy boundary has been interpreted as glacial in origin. Unknown are (1) the original thickness of the glacier ice, (2) the amount of ice-surface lowering, through sublimation and retreat, to its presently observed level, and (3) whether there were multiple periods of glaciation. We address these questions through analysis of an LVF glacial system. The elevation difference between the upper limit of a previous highstand and the current surface of the LVF at the study site is ~920 m. We interpret this difference to be the minimum amount of ice-surface lowering of the glacier system. Consistent with a general lowering of the ice surface are multiple moraines and/or trimlines, and changes in LVF flow patterns, as the ice retreated and decreased in thickness. The superposition of several lobes onto the current surface of the LVF indicates that a phase of alpine glaciation followed the lowering of the valley glacial system. These data suggest that the Late Amazonian glaciation that produced LVF in this region involved significantly larger amounts of ice than previously thought, and that subsequent alpine glaciation followed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1130/G24382A.1DOIArticle
http://geology.gsapubs.org/content/36/5/411PublisherArticle
http://geology.geoscienceworld.org/content/36/5/411PublisherArticle
ORCID:
AuthorORCID
Head, James W.0000-0003-2013-560X
Additional Information:© 2008 The Geological Society of America. Manuscript received 7 September 2007; Revised manuscript received 28 January 2008; Manuscript accepted 6 February 2008. First Published on May 02, 2008. This paper was greatly enhanced by reviews from Jeff Kargel, Mary Chapman, and an anonymous reviewer. Caleb Fassett provided invaluable assistance with Mars Orbiter Laser Altimeter track extraction and extensive discussions. Digital elevation models produced by the High Resolution Stereo Camera team are much appreciated. We acknowledge financial support from the National Aeronautics and Space Administration (Mars Data Analysis, Mars Express Participating Scientist, and Applied Information Systems Research Programs to Head]), and the Mars Fundamental Research Program and the National Science Foundation Office of Polar Programs (to Marchant and Head).
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Funding AgencyGrant Number
NASAUNSPECIFIED
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Issue or Number:5
Record Number:CaltechAUTHORS:20161129-105206763
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20161129-105206763
Official Citation:Late Amazonian glaciation at the dichotomy boundary on Mars: Evidence for glacial thickness maxima and multiple glacial phases James L. Dickson, James W. Head, David R. Marchant Geology May 2008, 36 (5) 411-414; DOI: 10.1130/G24382A.1
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:72401
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:29 Nov 2016 19:02
Last Modified:09 Mar 2020 13:18

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