Abstract
We present new data on the geologic structure and paleomagnetism of the Vendian and Lower Cambrian deposits of the Argun River region in East Transbaikalia. We discuss the issues related to the recog� nition of the Argun microcontinent within the composite blocks of the southeastern part of the Central Asian belt, which are traditionally combined in the Amuria superterrane. Our paleomagnetic determinations help us justify the equatorial position of the sedimentary basin, in which the deposits of the Argun terrane Beletuy and Bystrin formations formed 560 and 525 Ma, close to or directly on the margin of the Siberian paleocon� tinent. This data is essential for the reconstruction of the geodynamic evolution of Siberia and Central Asia at the PrecambrianPaleozoic boundary.
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