HIGH ALUMINA PRE-CAMBRIAN FORMATIONS OF MIDDLE SIBERIA

V. V. Zhabin

Siberian Research Institute of Geology, Geophysics and Mineral Resources, Novosibirsk, Russia

The paper discusses a possible mechanism of evolution of high alumina formations in the pre-Cambrian of Middle Siberia during four age epochs (provisionally: Archean, Early Riphean, Middle-Upper Riphean, Vendian). The formations have different evolution periods and productivity. The high alumina rocks within the identified formations are considered to have derived from the crust of chemical weathering that had occurred several times since the Late Archean time at the activated ancient shields and platforms of different continents.

Keywords: pre-Cambrian of Middle Siberia, age epochs, high alumina formations, chemical weathering crust, bauxites, corundites, high alumina crystalline shales

DOI 10.20403/2078-0575-2017-6s-102-109