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Zircon ages for a felsic volcanic rock and arc-related early Palaeozoic sediments on the margin of the Baydrag microcontinent, central Asian orogenic belt, Mongolia

Journal article
Authors A. Kröner
A. Demoux
Thomas Zack
Y. Rojas-Agramonte
P. Jian
D. Tomurhuu
M. Barth
Published in Journal of Asian Earth Sciences
Volume 42
Issue 5
Pages 1008-1017
ISSN 1367-9120
Publication year 2011
Published at Department of Earth Sciences
Pages 1008-1017
Language en
Keywords central asian orogenic belt, mongolia, detrital zircon age, bayankhongor ophiolite zone, phanerozoic crustal growth, u-pb, isotopic evidence, time constraints, geochronology, magmatism, accretion, geodynamics, evolution
Subject categories Earth and Related Environmental Sciences, Geology, Solid earth geology and petrology, Geochemistry

Abstract

Magmatic zircons from the basal part of an arc terrane in the accretionary complex NE of the Baydrag microcontinental block in central Mongolia were dated at 544 +/- 7 Ma and reflect arc magmatism at the Ediacaran/Cambrian boundary. Detrital zircon ages for clastic metasediments of the adjacent Dzag zone suggest a depositional age <445 +/- 6 Ma and suggest that the zircons were not derived from the arc terrane which was probably not exposed in the Late Ordovician. The detrital age pattern is similar to the overall pattern for Mongolian detrital and xenocrystic zircons and suggests significant input from a Grenville-age source that could either be the Tarim craton or microcontinental blocks within the central Asian collage of arcs and microcontinents. (C) 2010 Published by Elsevier Ltd.

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