Early – Middle Paleozoic geology of the Sea of Japan Continent – Ocean Transitional Zone (review). Pt 2. L.A. IZOSOV, N.P. KULKOV

Abstract

Early – Middle Paleozoic geology of the Sea of Japan Continent – Ocean Transitional Zone (review). Pt 2.
L.A. IZOSOV (V.I. Il’ichev Pacific Oceanological Institute, FEB RAS, Vladivostok), N.P. KULKOV (Siberian Research
Institute of Geology, Geophysics and Mineral Resources, Novosibirsk).

On the basis of extensive material the correlation of Lower – Middle Paleozoic local-rank stratigraphic divisions of the Sea of Japan Continent – Ocean Transitional Zone is carried out for the first time. The stratified and non-stratified magmatic complexes of these ages, representing volcanic, subvolcanic, volcano-plutonic and plutonic generations are allocated. The authors have considered territorially separate, generally paleontologically characterized Ordovician, Silurian and Devonian sections of the given region in details. In the structures superimposed on Precambrian Massifs, considered sediments are usually well traced along the strike, while in Polycyclic Mobile Belts they lie down often in the form of olistoliths in Mesozoic mixtites or – large xenoliths in uneven-aged granitoids. Submarine Ordovician, Silurian and Devonian sediments of JZ accumulated in similar paleogeographic conditions, practically in the same sediment basins, which incorporated to the Central-Asian, Okhotsk and Australian Seas. Continental deposits of the investigated territory are presented by the Devonian strata, including the numerous vegetative remnants, widespread as well in the Central Kazakhstan, Western Siberia, Okhotsk Region and in Southern China.