Abstract
The West Siberian Basin (WSB) is one of the largest intracratonic Meso-Cenozoic basins in the world. Its evolution has been studied over the recent decades; however, some fundamental questions regarding the tectonic evolution of the WSB remain unresolved or unconfirmed by analytical data. A complete understanding of the evolution of the WSB during the Mesozoic and Cenozoic eras requires insights into the cooling history of the basement rocks as determined by low-temperature thermochronometry. We presented an apatite fission track (AFT) thermochronology study on the exposed parts of the WSB basement in order to distinguish tectonic activation episodes in an absolute timeframe. AFT dating of thirteen basement samples mainly yielded Cretaceous cooling ages and mean track lengths varied between 12.8 and 14.5 μm. Thermal history modeling based on the AFT data demonstrates several Mesozoic and Cenozoic intracontinental tectonic reactivation episodes affected the WSB basement. We interpreted the episodes of tectonic activity accompanied by the WSB basement exhumation as a far-field effect from tectonic processes acting on the southern and eastern boundaries of Eurasia during the Mesozoic–Cenozoic eras.
Highlights
It is thought that the tectonic evolution of intracratonic basins is to a large extent controlled by geodynamic processes in the lithospheric mantle [1,2,3]
Thirteen apatite fission track (AFT) ages were reported as conventional zeta ages for samples from the West Siberian Basin (WSB) basement
AFT ages obtained in this study fit with observations that are widespread for the Central Asian Orogenic Belt (CAOB) area to the south of the WSB (Figure 6)
Summary
It is thought that the tectonic evolution of intracratonic basins is to a large extent controlled by geodynamic processes in the lithospheric mantle [1,2,3] Uplift events such as doming can, for example, be associated with mantle plume activity and the propagation of the plume material to the Earth’s surface. The formation and evolution of the KTFZ are controlled by a thrust fault system The formation of these faults is associated with tectonic deformation due to the collisional events between the Baltica, Siberian, and Kazakhstan paleocontinents [11,12] during the Middle–Late Paleozoic and Early Mesozoic. The studied granite massifs of the KTFZ (Ob and Novosibirsk) are of Permian–Triassic age based on data from several geochronological systems. Studying the massifs with different exhumation histories potentially allows evaluation of the tectonic history of the WSB basement, and considers the potential to reveal differential denudation histories within a single area during the same time interval
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