The Early Baikalian crystalline complex in the basement of the Dzabkhan microcontinent of the Early Caledonian orogenic area, Central Asia

Fragments of continental blocks or microcontinents are represented in the Early Caledonian orogenic area of Central Asia (or Early Caledonian superterrane); the largest of these are the Dzabkhan and Tuva-Mongolian microcontinents, with Early and Late Precambrian crystalline basements, respectively....

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Published in:Stratigraphy and geological correlation 2012-05, Vol.20 (3), p.231-239
Main Authors: Kozakov, I. K., Yarmolyuk, V. V., Kovach, V. P., Bibikova, E. V., Kirnozova, T. I., Kozlovskii, A. M., Plotkina, Yu. V., Fugzan, M. M., Lebedev, V. I., Erdenezhargal, Ch
Format: Article
Language:English
Subjects:
Archaeology
Continental dynamics
Crystalline rocks
Earth and Environmental Science
Earth Sciences
Geology
Geophysics/Geodesy
Historical Geology
Isotope studies
Metamorphic rocks
Metamorphism
Orogeny
Precambrian
Sedimentology
Stratigraphy
Structural Geology
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Summary:Fragments of continental blocks or microcontinents are represented in the Early Caledonian orogenic area of Central Asia (or Early Caledonian superterrane); the largest of these are the Dzabkhan and Tuva-Mongolian microcontinents, with Early and Late Precambrian crystalline basements, respectively. In the linkage zone of these microcontinents, crystalline rocks of the Tarbagatai and Songino blocks that are considered as units of the Early Precambrian ensialic basement of the superterrane are also known. They are composed of strongly metamorphosed rocks formed during the Early Baikalian orogeny about 790 to 820 Ma. U-Pb zircon dating and Nd isotope studies revealed, within the northwestern Dzabkhan microcontinent, the Dzabkhan-Mandal zone of crystalline rocks associated with the Riphean crust-forming process. The age of the gneiss substrate of this zone is estimated as 1.3 to 0.86 Ga. An early episode of metamorphism is dated at about 856 ± 2 Ma. The data available so far indicate a heterogeneous structure of the Dzabkhan microcontinent basement represented by Early Precambrian and Early and Late Baikalian crystalline formations.
ISSN:0869-5938
1555-6263
DOI:10.1134/S0869593812030057