CONFIRMATION OF ALTAI-MONGOLIA MICROCONTINENT AND ITS IMPLICATIONS

Abstract

Chinese Altai has proterozoic basement, and probably experienced four major events during Proterozoic era. Research about Precambrian basement is the base of dertermination of Altai-Momgolia microcontinent. The span of Habahe group extending about 1500 kilometers is from Sinian to Middle Ordovician and is belived to be continental margin sediment of Altai-Mongolia microtinent. Research about Habahe group is the key to determine Altai-Mongolia microtinent. Dongxileke group formed during the relaxing stage after two continent (Altai-Mongolia and Siberia) collided, Baihaba granite formed during post-collional tectonic environment. Research about Dongxileke group and Baihaba granite is important evidence of determining Altai-Momgolia microcontinent. The northern and southern edges of Altai-Momgolia microcontinent are ascertained. Altai-Mongolia microcontinent is a immature continent mainly composed of proterozoic matter according to geochemical data of Habahe group.