STRIKE-SLIP TECTONICS AND SUBALKALINE MAFIC MAGMATISM IN THE EARLY PALEOZOIC COLLISIONAL SYSTEM OF THE WESTERN BAIKAL REGION
V.S. Fedorovskya, E.V. Sklyarovb, A.E. Izokhc, A.B. Kotovd, A.V. Lavrenchukc and A.M. Mazukabzovb
aGeological Institute, Russian Academy of Sciences, Pyzhevskii per. 7, Moscow, 119017, Russia
bInstitute of the Earth's Crust, Siberian Branch of the Russian Academy of Sciences, ul. Lermontova 128, Irkutsk, 664033, Russia
cV.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences, prosp. Akad. Koptyuga 3, Novosibirsk, 630090, Russia
dInstitute of Precambrian Geology and Geochronology, Russian Academy of Sciences, nab. Makarova 2, St. Petersburg, 199034, Russia
Keywords: Strike-slip tectonics, subalkaline mafic magmatism, mingling, Early Paleozoids, western Baikal region
Pages: 534-547
Abstract
We discuss strike-slip tectonics as the key agent in the formation of the Early Paleozoic (Caledonian) collisional system of the western Baikal region. This tectonic setting implies existence of local syncompressional extension, with the ensuing conditions for mantle drainage and magmatism. Lower-middle crust collisional complexes exposed in the Olkhon area of the western Baikal region provide a record of synmetamorphic subalkaline-mafic magmatism associated with the early synorogenic collapse of the Olkhon collisional system, a part of the Central Asian collisional-accretionary belt.
|
