The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan
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-Nu...
| Main Authors: | , , , , , |
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| Format: | Journal Article |
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Elsevier BV
2018
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| Online Access: | http://purl.org/au-research/grants/arc/DP150101730 http://hdl.handle.net/20.500.11937/72769 |
| _version_ | 1848762837497806848 |
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| author | Jepson, G. Glorie, S. Konopelko, D. Mirkamalov, R. Danišík, Martin Collins, A. |
| author_facet | Jepson, G. Glorie, S. Konopelko, D. Mirkamalov, R. Danišík, Martin Collins, A. |
| author_sort | Jepson, G. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T10:53:55Z |
| format | Journal Article |
| id | curtin-20.500.11937-72769 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:53:55Z |
| publishDate | 2018 |
| publisher | Elsevier BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-727692021-01-08T07:54:27Z The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan Jepson, G. Glorie, S. Konopelko, D. Mirkamalov, R. Danišík, Martin Collins, A. 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. 2018 Journal Article http://hdl.handle.net/20.500.11937/72769 10.1016/j.gr.2018.08.003 http://purl.org/au-research/grants/arc/DP150101730 http://creativecommons.org/licenses/by/4.0/ Elsevier BV fulltext |
| spellingShingle | Jepson, G. Glorie, S. Konopelko, D. Mirkamalov, R. Danišík, Martin Collins, A. The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan |
| title | The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan |
| title_full | The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan |
| title_fullStr | The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan |
| title_full_unstemmed | The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan |
| title_short | The low-temperature thermo-tectonic evolution of the western Tian Shan, Uzbekistan |
| title_sort | low-temperature thermo-tectonic evolution of the western tian shan, uzbekistan |
| url | http://purl.org/au-research/grants/arc/DP150101730 http://hdl.handle.net/20.500.11937/72769 |