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Discovery of a flank caldera and very young glaciation at Hecates Tholus, Mars

Hauber, E. and Van Gasselt, S. and Ivanov, B. and Werner, S. and Head, J.W. and Neukum, G. and Jaumann, R. and Greeley, R. and Mitchell, K.L. and Muller, P. and HRSC Co-Investigator Team, (2005) Discovery of a flank caldera and very young glaciation at Hecates Tholus, Mars. Nature, 434, pp. 353-361.

Full text not available from this repository.

Abstract

The majority of volcanic products on Mars are thought to be mafic and effusive. Explosive eruptions of basic to ultrabasic chemistry are expected to be common, but evidence for them is rare and mostly confined to very old surface features. Here we present new image and topographic data from the High Resolution Stereo Camera that reveal previously unknown traces of an explosive eruption at 30°N and 149°E on the northwestern flank of the shield volcano Hecates Tholus. The eruption created a large, 10-km-diameter caldera ~350million years ago. We interpret these observations to mean that large-scale explosive volcanism on Mars was not confined to the planet's early evolution. We also show that glacial deposits partly fill the caldera and an adjacent depression. Their age, derived from crater counts, is about 5 to 24 million years. Climate models predict that near-surface ice is not stable at mid-latitudes today, assuming a thermo-dynamic steady state. Therefore, the discovery of very young glacial features at Hecates Tholus suggests recent climate changes. We show that the absolute ages of these very recent glacial deposits correspond very well to a period of increased obliquity of the planet's rotational axis.

Item URL in elib:https://elib.dlr.de/11141/
Document Type:Article
Additional Information: LIDO-Berichtsjahr=2005,
Title:Discovery of a flank caldera and very young glaciation at Hecates Tholus, Mars
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hauber, E.UNSPECIFIEDUNSPECIFIED
Van Gasselt, S.Institute of Geosciences, FU Berlin, Berlin, GermanyUNSPECIFIED
Ivanov, B.Institute for Dynamics of Geospheres, Russian Academy of Sciences, Moscow, RussiaUNSPECIFIED
Werner, S.Institute of Geosciences, FU Berlin, Berlin, GermanyUNSPECIFIED
Head, J.W.Department of Geological Sciences, Brown University, Providence, RI, USAUNSPECIFIED
Neukum, G.Institute of Geosciences, FU Berlin, Berlin, GermanyUNSPECIFIED
Jaumann, R.UNSPECIFIEDUNSPECIFIED
Greeley, R.Department of Geological Sciences, Arizona State University, Tempe, AZ, USAUNSPECIFIED
Mitchell, K.L.Environmental Science Department, Lancaster University, Lancaster, UKUNSPECIFIED
Muller, P.Department of Geomatic Engineering, University College London, London, UKUNSPECIFIED
HRSC Co-Investigator Team, UNSPECIFIEDUNSPECIFIED
Date:2005
Journal or Publication Title:Nature
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:Yes
Volume:434
Page Range:pp. 353-361
Status:Published
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):UNSPECIFIED
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Pieth, Susanne
Deposited On:08 Dec 2005
Last Modified:14 Jan 2010 16:54

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