Abstract
The Zyryanka Composite Tectono-Sedimentary Element is located in NE Asia. It consists of a synonymous sedimentary basin that is one of the least studied onshore basins in NE Asia due to its remoteness and the scarcity of wells and geophysical data. The basin evolved through four episodes of subsidence and two episodes of contraction. The Late Jurassic–Late Cretaceous subsidence is inferred to be caused by tectonic loading during contraction events within the Verkhoyansk–Kolyma Orogen, which led to the deposition of up to 10 km of predominantly continental siliciclastic strata. In the Cenozoic, the basin evolved in a post-orogenic intracontinental setting and accumulated a 2–3 km-thick succession of continental siliciclastic strata. In the Oligocene–Mid-Miocene, the basin evolved in a contractional setting, caused by a convergence between the Eurasian and North American lithospheric plates, and underwent a contractional deformation in the Middle Miocene. We recognize four individual tectono-sedimentary elements that are related to different stages of the basin's evolution. The basin contains significant coal resources. It was also considered a potential prospective area for the formation of hydrocarbon accumulations, especially in its Upper Jurassic–Cretaceous strata; however, drilled wells did not encounter any oil- or gas-bearing reservoirs.
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