The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan

Gilby Jepson, Stijn Glorie, Dmitry Konopelko, Rustam Mirkamalov, Martin Danišík, Alan S. Collins

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

The Kyzylkum-Nurata region represents a key area in understanding the tectonic evolution of the western Tian Shan. In this study, we present new thermochronological data (apatite fission track and apatite (U-Th-Sm)/He) and associated thermal history models for 45 igneous samples from the Kyzylkum-Nurata Segment of South Tian Shan on the territory of Uzbekistan and Tajikistan. Our data show that the Kyzylkum-Nurata Segment experienced a multi-phase Mesozoic thermal history that differs from previously studied segments of the Tian Shan. A Triassic (~220–200 Ma) cooling signal is widespread throughout the Tian Shan and is interpreted as being associated with exhumation following the closure of the Palaeo-Asian Ocean. Following this period of fast cooling, the Kyzylkum-Nurata Segment experienced a period of slow cooling and erosion in the Early Jurassic (~190–160 Ma). However, in contrast to other parts of the Tian Shan, our study area preserves evidence for rapid cooling during the Late Jurassic–Early Cretaceous (~160–120). Given that this rapid cooling signal was only recorded for samples in association with major structures (e.g., relic suture-shear zones), we interpret this event as a period of fault reactivation related with tectonic processes at the Eurasian margin of the Tethys Ocean. Subsequently, the Late Cretaceous–early Palaeogene (~100–50 Ma) is characterised by slow cooling and erosion. Since the late Palaeogene, the basement of the Tian Shan experienced cooling related to the India-Eurasia collision. The thermal signal of this collision has been extensively recorded in the high-altitude Kyrgyz Tian Shan. Within the low-relief Kyzylkum-Nurata Segment, this Cenozoic overprint is not recorded, allowing for a detailed assessment of the Mesozoic thermal and landscape evolution of the western Tian Shan. Our study demonstrates that the Cretaceous Uzbek Tian Shan was characterised by a series of parallel, linear mountain belts that formed along suture zones during fault reactivation.

Original languageEnglish
Pages (from-to)122-136
Number of pages15
JournalGondwana Research
Volume64
DOIs
Publication statusPublished - 1 Dec 2018

Keywords

  • HERCYNIAN POSTCOLLISIONAL MAGMATISM
  • ASIAN OROGENIC BELT
  • NORTHERN TIEN-SHAN
  • FISSION-TRACK
  • U-PB
  • INTRACONTINENTAL DEFORMATION
  • APATITE (U-TH)/HE
  • TARIM BASIN
  • EXHUMATION
  • INDIA

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