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Tethys: Lithospheric thickness and heat flux from flexurally supported topography at Ithaca Chasma

Giese, Bernd and Wagner, Roland and Neukum, Gerhard and Helfenstein, Paul and Thomas, Peter (2007) Tethys: Lithospheric thickness and heat flux from flexurally supported topography at Ithaca Chasma. Geophysical Research Letters, 34, L21203. DOI: 10.1029/2007GL031467

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Abstract

We have identified flexural uplift along the flanks of Tethys' Ithaca Chasma using Cassini stereo-derived topography. Modeling the topography as a broken elastic plate yields an effective elastic lithospheric thickness in the range of 5–7 km and, combined with the strength envelope of the lithosphere, a mechanical lithospheric thickness of 16–20 km. Surface heat fluxes are 18–30 mW/m<sup>2</sup> for adopted strain rates of 10<sup>−17</sup>–10<sup>−14</sup> s<sup>−1</sup>. These heat fluxes are more than 4 times higher than those calculated from thermal history models of Tethys and indicate a strongly enhanced local heat flux associated with the formation of Ithaca Chasma. We use crater-size frequency counts and a lunar-like impact chronology to fix the time of formation of Ithaca Chasma at 4 Ga from present-day. Ithaca Chasma predates the Odysseus basin and thus could not have been formed by this impact feature.

Item URL in elib:https://elib.dlr.de/51848/
Document Type:Article
Title:Tethys: Lithospheric thickness and heat flux from flexurally supported topography at Ithaca Chasma
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Giese, BerndUNSPECIFIEDUNSPECIFIED
Wagner, RolandUNSPECIFIEDUNSPECIFIED
Neukum, GerhardFreie Universität BerlinUNSPECIFIED
Helfenstein, PaulCornell University, Ithaca, New York, USAUNSPECIFIED
Thomas, PeterCornell University, Ithaca, New York, USAUNSPECIFIED
Date:November 2007
Journal or Publication Title:Geophysical Research Letters
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:34
DOI :10.1029/2007GL031467
Page Range:L21203
Editors:
EditorsEmail
American Geophysical Union (AGU), UNSPECIFIED
Status:Published
Keywords:Tethys, Saturnian satellites, Heat flow, Ithaca Chasma
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):W - Vorhaben Vergleichende Planetologie (old), W - Vorhaben CASSINI (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Giese, Dr.rer.nat. Bernd
Deposited On:26 Jan 2009
Last Modified:12 Dec 2013 20:28

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