CORRELATION OF PREJURASSIC SECTIONS OF ANCIENT CONTINENTS AND MICROCONTINENTS IN EAST-ASIA

Between the Siberian and north China platforms, within the Mongol-Okho tsk fold belt there are a series of ancient massifs (microcontinents), whose origin is not yet known. Combined with available data, the auth or's studies support the conclusion that the Siberian and north China continents, as well as the Tuvin-Mongolian and central Mongolian micro continents constituted a unified supercontinent in Early Riphean. The formation of the Paleoasian and Mongol-Okhotsk oceans resulted in its disintegration in Late Riphean. Other Precambrian massifs of this regi on such as Near Argun, Jiamusi-Bureya, South Gobi and Xingkai are allo chthonous terranes of an unknown origin and age. The structures of the ir basement and sedimentary cover are not similar to those of the Sibe rian and north China platforms. Copyright (C) 1996 Elsevier Science Lt d