Investigation of the isostatic state of the Elysium dome on Mars by gravity models

Physics

Scientific paper

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Gravity Anomalies, Mars Surface, Planetary Crusts, Planetary Mantles, Line Of Sight, Lithosphere, Planetary Geology, Topography, Viking Orbiter 2, Mars, Isostacy, Elysium Region, Gravity Effects, Model, Anomalies, Density, Compensation, Topography, Mass, Crusts, Thickness, Ages, Lithosphere, Photogeology, Hypotheses

Scientific paper

Gravity anomalies from density models have been fitted to line-of-sight (LOS) gravity data for the Elysium dome on Mars. Various degrees of compensation have been investigated, under the assumption of either Airy or a modified Pratt compensation. The models yield compensations of the topographic mass between 89.1 and 100 percent. The results imply upper and lower limits for the mean crustal thickness of 30 and 120 km. The lower limit for the lithospheric thickness is 150 km, as derived from Pratt models. A synopsis of photogeological results and age determinations from crater statistics, and the preference for Airy compensation, i.e., crustal thickening, in the dome area, lead to the hypothesis of a micro-continent in relation to the Elysium dome.

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