PALEOMAGNETIC CONSTRAINTS FROM NEOPROTEROZOIC TO EARLY-CAMBRIAN ROCKS IN MONGOLIA: IMPLICATIONS FOR STURTIAN GLACIATIONS AND MICROCONTINENT EVOLUTION
We will present paleomagnetic data from the Tsagaan Oloom and Bayan Gol formations, both of which are sedimentary sequences accumulated in a back-arc basin related to microcontinent accretion. The Neoproterozoic glaciations are represented at the base of the Tsagaan Oloom formation and overly the 850-700 Ma (Khomentovsky and Gibsher, 1996) Dzabkhan volcanic sequence. Previous studies from the area have yet to agree on a single conclusion and show possible remagnetization and overprints. However we will report more precise paleomagnetic data on a greater number of samples in order to determine paleolocation of glacial deposits and the ancient tectonic evolution of the area.