Paleomagnetism and Age Correlation of the Mesoproterozoic Rocks of the Udzhaand Olenek Uplifts, Northeastern Siberian Platform
The results of paleomagnetic studies of the Proterozoic sedimentary and igneous rocks composing the sections of the Olenek and Udzha uplifts are presented. Carbonate rocks of the upper subformation of the Khaipakh Formation have been studied within the Olenek uplift, and terrigenous and volcanic-sedimentary rocks of the Udzha and Unguokhtakh formations as well as the Early Mesoproterozoic igneous complex have been investigated within the Udzha uplift. The obtained paleomagnetic data (1) indicate that the Upper Khaipakh subformation of the Olenek uplift and the Udzha Formation of the Udzha uplift were formed at different times, which contradicts the currently accepted correlation scheme of the Proterozoic sections in northern Siberian platform; (2) support the existence of two stages of the Proterozoic magmatism in the territory of the Udzha uplift, with the more ancient stage of an age of ~1500 Ma according to the paleomagnetic data; (3) show that from ~1500 to 1110 Ma ago, the Siberian platform was located in the equatorial and subequatorial latitudes.