Thermochronology of the northern part of the Verkhoyansk Fold-and-Thrust Belt according to apatite fission-track age

The paper presents the results of thermochronological studies conducted in the front of the northern part of the Verkhoyansk fold-and-thrust belt and the Priverkhoyansk foredeep with the aim toestablish the age of paleo-uplifts and their possible relation to tectonic events. The results of fission track analysis of apatite grains extracted from 12 samples of Permian-Eocene sandstones point confidently to the occurrence of a thermotectonic event at 77–57 Ma (Campanian-Paleocene), which was accompanied by high denudation rates. It is supposed that this was the time of the final formative stage of the Kharaulakh anticlinorium front. Deposits of the Kengdey graben are dominated by apatite grains with track ages of about 73.6±3.5 Ma, which are close to this thermochronologic event. Accumulation of these strata was likely accompanied by the erosion of the uplifting foldbelt. It is assumed that some more thermotectonic events occurred in the area under study at 110–55, 95–90, 50–25, and 45–40 Ma.

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