Tectonic History of the South Tannuol Fault Zone (Tuva Region of the Northern Central Asian Orogenic Belt, Russia): Constraints from Multi-Method Geochronology
| Autor: | Polina I. Mikhailova, Gerben Van Ranst, Johan De Grave, F.I. Zhimulev, Natalia I. Vetrova, E.V. Vetrov, Simon Nachtergaele |
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| Rok vydání: | 2020 |
| Předmět: |
geography
lcsh:Mineralogy lcsh:QE351-399.2 AFT thermochronology geography.geographical_feature_category Felsic 010504 meteorology & atmospheric sciences Permian zircon U/Pb dating Geochemistry Geology 010502 geochemistry & geophysics Geotechnical Engineering and Engineering Geology Fission track dating 01 natural sciences Volcanic rock Thermochronology Earth and Environmental Sciences Geochronology 40Ar/39Ar dating Mafic Tuva Region 0105 earth and related environmental sciences Zircon |
| Zdroj: | Minerals Volume 10 Issue 1 MINERALS Minerals, Vol 10, Iss 1, p 56 (2020) |
| ISSN: | 2075-163X |
| Popis: | In this study, we present zircon U/Pb, plagioclase and K-feldspar 40Ar/39Ar and apatite fission track (AFT) data along the South Tannuol Fault Zone (STFZ). Integrating geochronology and multi-method thermochronology places constraints on the formation and subsequent reactivation of the STFZ. Cambrian (~510 Ma) zircon U/Pb ages obtained for felsic volcanic rocks date the final stage of STFZ basement formation. Ordovician (~460&ndash 450 Ma) zircon U/Pb ages were obtained for felsic rocks along the structure, dating their emplacement and marking post-formational local magmatic activity along the STFZ. 40Ar/39Ar stepwise heating plateau-ages (~410&ndash 400 Ma, ~365 and ~340 Ma) reveal Early Devonian and Late Devonian&ndash Mississippian intrusion and/or post-magmatic cooling episodes of mafic rocks in the basement. Permian (~290 Ma) zircon U/Pb age of mafic rocks documents for the first time Permian magmatism in the study area creating prerequisites for revising the spread of Permian large igneous provinces of Central Asia. The AFT dating and Thermal history modeling based on the AFT data reveals two intracontinental tectonic reactivation episodes of the STFZ: (1) a period of Cretaceous&ndash Eocene (~100&ndash 40 Ma) reactivation and (2) the late Neogene (from ~10 Ma onwards) impulse after a period of tectonic stability during the Eocene&ndash Miocene (~40&ndash 10 Ma). |
| Databáze: | OpenAIRE |
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