Journal
STRATIGRAPHY AND GEOLOGICAL CORRELATION
Volume 15, Issue 2, Pages 121-140Publisher
PLEIADES PUBLISHING INC
DOI: 10.1134/S0869593807020013
Keywords
geochronology; zircons; Nd-isotope systematics; Archean; Lower Proterozoic; Dzabkhan microcontinent; Central Asia; proterozoic supercontinents
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In the Early Caledonian superterrane of Central Asia, an accretionary orogen of mosaic structure, pre-Riphean Baidaragin and Bumbuger complexes are exposed in the Baidarik block of the Dzabkhan microcontinent. Zircon dating on ion-ion SHRIMP II microprobe and Nd isotopic-geochemical systematics are used to establish protolith age for Neoarchean orthogneisses of the Baidaragin complex, age constraints for accumulation of Lower Proterozoic metasediments of the Bumbuger Complex and provenance of sedimentary material. The results of isotopic dating facilitate correlation of the Baidarik block crystalline complexes with basement formations of North Eurasian ancient cratons. Possible position and migration path of the Dzabkhan microcontinent during the Early Proterozoic transformation of supercontinents Columbia-Rodinia-Pangea are considered based on interpretation of paleomagnetic data.
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