Thermochronological insights into the structural contact between the Tian Shan and Pamirs, Tajikistan

Gilby Jepson, Stijn Glorie, Dmitry Konopelko, Jack Gillespie, Martin Danišík, Noreen J. Evans, Yunus Mamadjanov, Alan S. Collins

Research output: Contribution to journalArticlepeer-review

27 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)95-104
Number of pages10
JournalTerra Nova
Volume30
Issue number2
DOIs
Publication statusPublished - 1 Apr 2018

Keywords

  • FISSION-TRACK THERMOCHRONOLOGY
  • SOUTHERN TIEN-SHAN
  • (U-TH)/HE THERMOCHRONOMETRY
  • CENOZOIC DEFORMATION
  • TECTONIC EVOLUTION
  • EXHUMATION HISTORY
  • CENTRAL-ASIA
  • APATITE
  • ZIRCON
  • AGE

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