Geometry, displacement-length scaling, and extensional strain of normal faults on Mars with inferences on mechanical stratigraphy of the Martian crust - Archive ouverte HAL
Article Dans Une Revue Journal of Structural Geology Année : 2009

Geometry, displacement-length scaling, and extensional strain of normal faults on Mars with inferences on mechanical stratigraphy of the Martian crust

Résumé

We measure throw distributions for graben-bounding normal faults from two areas on Mars to investigate fault growth, displacement-length (D-max-L) scaling, and extensional strain using a complementary suite of techniques. Faults in the northern plains are inferred to be restricted at 2-3 km depth, as shown by a transition from linear scaling, with D-max-L ratios of similar to 1 x 10(-3), to nonlinear scaling for faults >50 km long. On the Alba Patera volcano, faults conform to linear Dmax-L scaling, with a Dmax-L ratio of similar to 6 x 10(-3), consistent with more deeply penetrating faults that are not restricted at depth. These grabens accommodate larger extensional strains (similar to 0.84%) than the faults in the northern plains (similar to 0.23%), with a temporal change from regionally distributed to localized deformation and associated increases in D-max-L ratio extensional strain, and perhaps down-dip fault height. The results suggest that both spatial and temporal variations in extensional strain and displacement-length scaling relations, along with fault restriction, are recorded by Martian fault populations. (C) 2009 Elsevier Ltd. All rights reserved.

Dates et versions

hal-00420888 , version 1 (30-09-2009)

Identifiants

Citer

Anjani T. Polit, Richard A. Schultz, Roger Soliva. Geometry, displacement-length scaling, and extensional strain of normal faults on Mars with inferences on mechanical stratigraphy of the Martian crust. Journal of Structural Geology, 2009, 31 (7), pp.662-673. ⟨10.1016/j.jsg.2009.03.016⟩. ⟨hal-00420888⟩
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