Vertical and lateral collapse of Tharsis Tholus, Mars.

Platz, T., Münn, Sebastian, Walter, T. R., Procter, J. N., McGuire, P. C., Dumke, A. and Neukum, G. (2011) Vertical and lateral collapse of Tharsis Tholus, Mars. Earth and Planetary Science Letters, 305 (3-4). pp. 445-455. DOI 10.1016/j.epsl.2011.03.012.

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Tharsis Tholus, a more than 3.9 Ga old composite shield volcano to the east of the major Tharsis Montes, has experienced a complex history of growth and destruction. On the basis of new high resolution images we analysed the morphology as well as the tectonic structures of the Tharsis Tholus volcano in detail. From morphological data, cross-cutting relations of the surface structures, and crater modelling ages we propose a chronostratigraphy for the volcano-tectonic history of Tharsis Tholus.
The strongly faulted volcano reveals two large-scale landslide events followed by two subsequent shield re-growth phases between 3.8 and 1.7 Ga and two caldera collapses. Tharsis Tholus was also affected by regional extensional tectonics between 1.7 Ga and 0.4 Ga recorded by sub-parallel sets of NE trending graben structures. The steep and up to 5.4 km high landslide scarps on Tharsis Tholus suggest deep faulting of the edifice. In order to confirm this hypothesis we used analogue sand box models in which we demonstrated that gravitational flank movement on top of weak basal substrata may have produced the deformation structures as observed on Tharsis Tholus. (C) 2011 Elsevier B.V. All rights reserved.

Document Type: Article
Keywords: Meeresgeologie; Flank deformation; Caldera collapse; Graben; Volcano spreading; Shield volcano; Volcano-tectonic; RESOLUTION STEREO CAMERA; INTERPLANETARY CRUISE; RIFT ZONES; VOLCANO; DEFORMATION; MORPHOLOGY; GALAPAGOS; EVOLUTION; LANDSLIDE; MISSION
Research affiliation: OceanRep > GEOMAR > FB4 Dynamics of the Ocean Floor > FB4-MUHS
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.epsl.2011.03.012
ISSN: 0012-821X
Date Deposited: 11 Jan 2012 14:15
Last Modified: 23 Sep 2019 21:31

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