Article ID Journal Published Year Pages File Type
1884522 Radiation Measurements 2008 5 Pages PDF
Abstract

The Chulyshman Plateau (CP) is located in the central Siberian Altai Mountains and is bordered by active strike-slip and thrust faults. The current mountainous morphology developed since the Late Miocene to Pliocene by transpressive tectonics as a distant effect of India–Eurasia convergence. The metamorphic basement of the plateau is widely intruded by Palaeozoic granitoids. To constrain the thermo-tectonic history, apatite fission-track (AFT) thermochronology on basement and granitoids was performed. Cretaceous AFT ages (∼130–90Ma) were obtained, while mean track lengths (13–14μm) and length distributions indicate thermal track shortening and prolonged residence in the apatite partial annealing zone. The AFT data were modelled and a three-stage thermal history model was reconstructed. First, a Late Jurassic–Cretaceous cooling is associated with Mesozoic tectonic reactivation of the area. A second stage is a Late Cretaceous–Early Neogene period of stability linked to regional peneplanation. Final cooling is related to denudation of the CP during Late Cenozoic tectonic reactivation.

Related Topics
Physical Sciences and Engineering Physics and Astronomy Radiation
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