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Geology; October, 2007; v. 35; no. 10; p. 871-874; DOI: 10.1130/G23758A.1
© 2007 Geological Society of America
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Mongolian summits: An uplifted, flat, old but still preserved erosion surface

Marc Jolivet1, Jean-François Ritz1, Riccardo Vassallo1, Christophe Larroque2, Régis Braucher3, Munkhjargal Todbileg4, Alain Chauvet5, Christian Sue6, Nicolas Arnaud7, Raquel De Vicente7, Anastasia Arzhanikova8 and Sergueï Arzhanikov8

1 Laboratoire Géosciences Montpellier, Centre National de la Recherche Scientifique Unité Mixte de Recherche 5243, Université Montpellier II, Montpellier, France
2 Laboratoire Géosciences Azur, Unité Mixte de Recherche Centre National de la Recherche Scientifique 6526, Bat 4, 250 avenue Einstein, 06560, Valbonne, France
3 Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement, Centre National de la Recherche Scientifique-Unité Mixte de Recherche 6635, Plateau d'Arbois, BP 80, 13545 Aix en Provence, France
4 Zoloton, Suite 4A, Building SOT-2, Bayangol district, P.O. 28, 210526, Ulaanbaatar, Mongolia
5 Laboratoire Géosciences Montpellier, Centre National de la Recherche Scientifique-Unité Mixte de Recherche 5243, Université Montpellier II, Montpellier, France
6 Institut Universitaire Européen de la Mer–Centre National de la Recherche Scientifique-Unité Mixte de Recherche 6538, Place Nicolas Copernic-Technopôle de Brest Iroise, 29280, Plouzané, France
7 Laboratoire Géosciences Montpellier, Centre National de la Recherche Scientifique-Unité Mixte de Recherche 5243, Université Montpellier II, Montpellier, France
8 Institute of the Earth Crust, Irkutsk, Russia

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.

Key Words: Mongolia • erosion surface • peneplain • uplift • thermochronology




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[Abstract] [Full Text] [PDF]


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