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Journal Articles Geology Year : 2007

Mongolian summits: An uplifted, flat, old but still preserved erosion surface

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Marc Jolivet
J.F. Ritz
Riccardo Vassallo
  • Function : Author
  • PersonId : 838796
Christophe Larroque
Munkhjargal Todbileg
  • Function : Author
Alain Chauvet
Christian Sue
  • Function : Author
  • PersonId : 959664
Nicolas Arnaud

Abstract

In Gobi Altay and Altay, Mongolia, several flat surfaces, worn through basement rocks and uplifted during the ongoing tectonic episode to a similar altitude of 4000 m, suggests disruption of a single large-scale surface. New thermochronology and field data show that the plateau surfaces represent uplifted parts of an ancient peneplain that formed during Jurassic time. The Gobi Altay and Altay flattopped massifs are tectonically and geomorphologically unique. Their preservation for ~150 m.y. implies that no further tectonic movements occurred before the onset of the last deformation episode, 5 ± 3 m.y. ago. It also suggests that very low erosion rates were maintained by a dry climate over millions of years.
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Dates and versions

hal-00406436 , version 1 (22-07-2009)

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Marc Jolivet, J.F. Ritz, Riccardo Vassallo, Christophe Larroque, Regis Braucher, et al.. Mongolian summits: An uplifted, flat, old but still preserved erosion surface. Geology, 2007, 35 (10), pp.871-874. ⟨10.1130/G23758A.1⟩. ⟨hal-00406436⟩
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