Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.0801g&link_type=abstract
American Astronomical Society, DPS meeting #40, #8.01; Bulletin of the American Astronomical Society, Vol. 40, p.398
Astronomy and Astrophysics
Astronomy
Scientific paper
We have identified flexural uplift along a rift zone of the Harran Sulci, Enceladus, using Cassini stereo-derived topography. Modeling the topography on the basis of a flexed broken elastic plate yields an effective lithospheric thickness of 0.3 km and, combined with the strength envelope, a mechanical lithospheric thickness of 2.5 km with heat fluxes of 150-220 mW/m2 at the time of formation. The heat fluxes are comparable with average heat fluxes measured in Enceladus’ active south polar area and correspond to heat fluxes derived via models of unstable extension of the lithosphere in this area. Surface porosity can reduce the heat fluxes to an estimated minimum of 40-50 mW/m2. Crater-size frequency counts and a lunar-like impact chronology fix the time of formation of the rift zone at 3.5 Ga from present-day.
Gerhard Neukum
Giese Bernd
Helfenstein Paul
Hussmann Hauke
Thomas Patrick
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