Evolution of the Kolyvan-Tomsk granitoid magmatism (Central Siberia): Insights into the tectonic transition from post-collision to intraplate settings in the northwestern part of the Central Asian Orogenic Belt

Tectonic Evolution of the SE West Siberian Basin (Russia): Evidence from Apatite Fission Track Thermochronology of Its Exposed Crystalline Basement

“…The WSB basement was formed as a result of collisional events between the Baltica, Siberian, and Kazakhstan paleocontinents [11,12], or the Russian Platform, the East Siberian Platform, and the Kipchak Arc complex [13,14] during the Middle-Late Paleozoic. The final amalgamation of the WSB basement was accompanied by mantle plume activity and during Permian-Triassic times, the WSB basement was affected by rift structures [8,[14][15][16]. In the early phases (~250 Ma ago) it was associated with the formation of a vast province of rift basalts and Siberian flood basalts on the Siberian craton [3].…”

“…The studied granite massifs of the KTFZ (Ob and Novosibirsk) are of Permian-Triassic age based on data from several geochronological systems. Ar-Ar dating of biotite from the Ob massif granitoids yielded 254.5 ± 2.4 and 249.7 ± 2.0 Ma [20], while zircon U-Pb ages were 260.7 ± 1.6 and 248.8 ± 0.4 Ma [8]. The Novosibirsk massif has a hornblende Ar-Ar age of 243.7 ± 2.1 Ma, a microcline Ar-Ar age of 249.1 ± 0.7 Ma [20], and zircon U-Pb ages ranging between 258.3 ± 0.6 and 249.2 ± 0.6 Ma [8].…”

“…Ar-Ar dating of biotite from the Ob massif granitoids yielded 254.5 ± 2.4 and 249.7 ± 2.0 Ma [20], while zircon U-Pb ages were 260.7 ± 1.6 and 248.8 ± 0.4 Ma [8]. The Novosibirsk massif has a hornblende Ar-Ar age of 243.7 ± 2.1 Ma, a microcline Ar-Ar age of 249.1 ± 0.7 Ma [20], and zircon U-Pb ages ranging between 258.3 ± 0.6 and 249.2 ± 0.6 Ma [8]. The age of the Kalman massif of the CTFZ is based on U-Pb dating of zircon (258.3 ± 2.3 Ma) [7].…”

“…Extensive borehole and seismic information and its elaborate interpretations permit constraining the tectonic vertical motions within the WSB using backstripping analysis in 2D [6]. Vibe and [7,8]) and (d) geological position of the Kalman massif (after [7,9]) with indication of sample locations. Depth of "n" km means depth of the massif root according to geophysical data [7].…”

“…A temperature range for AFT annealing is established between ~60-120 °C [10]. According to a geothermal gradient of 20-25 °C/km, which is [7,8]) and (d) geological position of the Kalman massif (after [7,9]) with indication of sample locations. Depth of "n" km means depth of the massif root according to geophysical data [7].…”