Skip to Main Content
Book Chapter

Using in situ–produced 10Be to quantify active tectonics in the Gurvan Bogd mountain range (Gobi-Altay, Mongolia)

By
J.-F. Ritz
J.-F. Ritz
Laboratoire Dynamique de la Lithosphère, CNRS-UMII UMR 5573, Université Montpellier II, Montpellier, France
Search for other works by this author on:
R. Vassallo
R. Vassallo
Laboratoire Dynamique de la Lithosphère, CNRS-UMII UMR 5573, Université Montpellier II, Montpellier, France
Search for other works by this author on:
R. Braucher
R. Braucher
CEREGE, Europole Méditerranéen de l'Arbois, Aix-en-Provence, France
Search for other works by this author on:
E.T. Brown
E.T. Brown
Large Lakes Observatory, University of Minnesota, Duluth, Minnesota 55812, USA
Search for other works by this author on:
S. Carretier
S. Carretier
Laboratoire des Mécanismes de Transfert en Géologie, IRD-CNRS-UNIV UMR 5563, Toulouse, France
Search for other works by this author on:
D.L. Bourlès
D.L. Bourlès
CEREGE, Europole Méditerranéen de l'Arbois, Aix-en-Provence, France
Search for other works by this author on:
Published:
January 01, 2006

This paper presents an updated synthesis of morphotectonic studies that quantify active tectonics along the Gurvan Bogd mountain range in the Mongolian Gobi-Altay, the site of one of the strongest historic intracontinental earthquakes (Mw 8.1) in 1957. Our goal was to determine the slip rate along the constituent fault segments and to estimate the return period of such large events. Along each segment, cumulative offsets were estimated from topographic surveys, and the ages of the offset markers were determined using cosmic-ray exposure dating. In this review, we reevaluate 10Be data reported in previous publications using a chi-square inversion analysis of depth profiles and an updated scaling model for spatial production rate variations. We also discuss sampling strategies for dating alluvial fans in arid settings.

This study confirms the low horizontal and vertical slip rates within the massifs of the Gurvan Bogd mountain range for the Late Pleistocene–Holocene period, suggests that episodes of aggradation occurred near the times of major glacial-interglacial terminations (at ca. 15–20 ka and ca. 100–130 ka), and provides evidence for another much earlier aggradational episode, occurring before 400 ka. The Bogd fault has a maximum horizontal left-lateral slip rate of ∼1.5 mm/yr, while reverse fault segments along the Gurvan Bogd fault system have vertical slip rates between 0.1 and 0.2 mm/yr. Characteristic dislocations observed along the Bogd fault suggest return periods of earthquakes similar to 1957 between 3000 and 4000 yr.

You do not currently have access to this article.
Don't already have an account? Register

Figures & Tables

Contents

GSA Special Papers

In Situ-Produced Cosmogenic Nuclides and Quantification of Geological Processes

Ana María Alonso-Zarza
Ana María Alonso-Zarza
Search for other works by this author on:
Lawrence H. Tanner
Lawrence H. Tanner
Search for other works by this author on:
Geological Society of America
Volume
415
ISBN print:
9780813724157
Publication date:
January 01, 2006

References

Related

A comprehensive resource of eBooks for researchers in the Earth Sciences

Related Book Content
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal