Thermochronological insights into the structural contact between the Tian Shan and Pamirs,Tajikistan |
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| Authors: | Gilby Jepson Stijn Glorie Dmitry Konopelko Jack Gillespie Martin Dani?ík Noreen J Evans Yunus Mamadjanov Alan S Collins |
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| Affiliation: | 1. Centre for Tectonics, Resources, and Exploration (TRaX), Department of Earth Sciences, The University of Adelaide, Adelaide, Australia;2. Saint Petersburg State University, SPb, Russia;3. Novosibirsk State University, Novosibirsk, Russia;4. John de Laeter Centre, Applied Geology, TIGeR, Curtin University, Perth, Australia;5. Institute of Geology, Earthquake Engineering and Seismology of the Academy Science of the Republic of Tajikistan, Dushanbe, Tajikistan |
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| Abstract: | Multi‐method thermochronology along the Vakhsh‐Surkhob fault zone reveals the thermotectonic history of the South Tian Shan–Pamirs boundary. Apatite U/Pb analyses yield a consistent age of 251 ± 2 Ma, corresponding to cooling below ~550–350°C, related to the final closure of the Palaeo‐Asian Ocean and contemporaneous magmatism in the South Tian Shan. Zircon (U–Th–Sm)/He ages constrain cooling below ~180°C to the end of the Triassic (~200 Ma), likely related either to deformation induced by the Qiangtang collision or to the closure of the Rushan Ocean. Apatite fission track thermochronology reveals two low‐temperature (<120°C) thermal events at ~25 Ma and ~10 Ma, which may be correlated with tectonic activity at the distant southern Eurasian margin. The late Miocene cooling is confirmed by apatite (U–Th–Sm)/He data and marks the onset of mountain building within the South Tian Shan that is ongoing today. |
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