PALEOMAGNETISM OF THE LATE PALEOZOIC GRANITES OF THE ANGARA-VITIM BATHOLITH AND THE HOST ROCKS OF THE BAIKAL-PATOM FOLDED AREA: TECTONIC IMPLICATIONS
A.V. Shatsillo1, I.V. Fedyukin1,2, V.I. Paverman1,3
1Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. Bol’shaya Gruzinskaya 10, Moscow, 123995, Russia
2Moscow State University, named after M.V. Lomonosov, Faculty of Geology
3Department of Geological and Environmental Sciences, Stanford University, United States
Keywords: Paleomagnetism, reconstructions, Late Paleozoic, Baikal-Patom folded area, Angara-Vitim batholith, Siberian Platform
Abstract
The paper presents the results of paleomagnetic and geochronological studies of the Late Paleozoic granites of the Angara-Vitim batholith as well as Vendian-Early Cambrian sedimentary rocks and Late Devonian subvolcanic rocks of the Patom margin of the Siberian Platform. Primary and metachronous magnetization in the rocks of the study region was used to calculate an Early Permian (~290 Ma) paleomagnetic pole, which is proposed as a reference pole for the Siberian Platform in paleomagnetic reconstructions, plotting of the apparent polar-wander path curve, and other magnetotectonic studies. The published and obtained paleomagnetic data and analysis of the geological data confirm the Late Paleozoic age of the final folding in the Baikal-Patom area. Possible causes of deformations and large-scale granite formation in the Baikal-Patom area and Transbaikalia in the Late Paleozoic are considered.
DOI: http://dx.doi.org/10.1016/j.rgg.2014.06.006
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