Tectonic Evolution of the Tuvinian Trough (Northern Part of Central Asian Orogenic Belt): Synthesis of Geological Data and Results of Feldspar Ar‒Ar Dating

The Tuvinian rift trough, located in the northern part of the Central Asian orogenic belt (CAOB), arose in the Early Devonian on Late Proterozoic (?)‒Early Paleozoic terranes as a result of Altai–Sayan mantle plume activity. The sedimentary record from the Middle Paleozoic to the Middle Mesozoic, pr...

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Veröffentlicht in:Geotectonics 2024-08, Vol.58 (4), p.449-464
Hauptverfasser: Vetrov, E. V., Vetrova, N. I., Biryukova, T. A., Agatova, A. R., Gavryushkina, O. A., Bulgakova, D. D.
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container_issue 4
container_start_page 449
container_title Geotectonics
container_volume 58
creator Vetrov, E. V.
Vetrova, N. I.
Biryukova, T. A.
Agatova, A. R.
Gavryushkina, O. A.
Bulgakova, D. D.
description The Tuvinian rift trough, located in the northern part of the Central Asian orogenic belt (CAOB), arose in the Early Devonian on Late Proterozoic (?)‒Early Paleozoic terranes as a result of Altai–Sayan mantle plume activity. The sedimentary record from the Middle Paleozoic to the Middle Mesozoic, preserved in the Tuvinian trough, and the Middle Paleozoic igneous complexes confined to the trough structures, reflect the evolutionary stages of Earth’s crust in the Tuva segment necessary for understanding the geological history of the CAOB as a whole. Dating of accessory and rock-forming minerals from igneous rocks using low-temperature geochronology methods yields additional information about postmagmatic processes, making it possible to update the regional tectonic evolution model. In this study, we have reconstructed the stages of tectonic development of the Tuvinian trough in the northern part of the CAOB based on analysis of geological and new Ar‒Ar dating data on feldspars from mafic intrusions. As a result, the chronology of the previously known stages of postmagmatic processes manifested in the Tuvinian trough was refined and new stages identified according to the tectonic evolution of the CAOB. Ar‒Ar dating of feldspars from eight samples yielded four age groups: (i) Late Devonian, (ii) Middle Carboniferous, (iii) Early Permian, and (iv) Early Jurassic. Late Devonian (~377 and 375 Ma) ages record an impulse of mafic magmatism, widely manifested in the northern segments of the CAOB (~380‒365 Ma). Middle Carboniferous (~320 and 319 Ma) dates may reflect closure of the Ob–Zaisan branch of the Paleo-Asian ocean as a result of the Kazakhstan–Siberian collision. Early Permian (~290–279 Ma) ages are consistent with the formation of Late Carboniferous–Early Permian (~305–275 Ma) large igneous provinces in connection with rifting processes in the northern segments of the CAOB. Lastly, a single Early Jurassic (~188 Ma) age marks tectonic reorganization of the CAOB in the Late Triassic‒Early Jurassic in response to (i) closure of the Paleotethys Ocean with subsequent collision of Cimmerian blocks and the southern margin of the Eurasian continent and/or (ii) Mongolian mantle plume activity.
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V. ; Vetrova, N. I. ; Biryukova, T. A. ; Agatova, A. R. ; Gavryushkina, O. A. ; Bulgakova, D. D.</creator><creatorcontrib>Vetrov, E. V. ; Vetrova, N. I. ; Biryukova, T. A. ; Agatova, A. R. ; Gavryushkina, O. A. ; Bulgakova, D. D.</creatorcontrib><description>The Tuvinian rift trough, located in the northern part of the Central Asian orogenic belt (CAOB), arose in the Early Devonian on Late Proterozoic (?)‒Early Paleozoic terranes as a result of Altai–Sayan mantle plume activity. The sedimentary record from the Middle Paleozoic to the Middle Mesozoic, preserved in the Tuvinian trough, and the Middle Paleozoic igneous complexes confined to the trough structures, reflect the evolutionary stages of Earth’s crust in the Tuva segment necessary for understanding the geological history of the CAOB as a whole. Dating of accessory and rock-forming minerals from igneous rocks using low-temperature geochronology methods yields additional information about postmagmatic processes, making it possible to update the regional tectonic evolution model. In this study, we have reconstructed the stages of tectonic development of the Tuvinian trough in the northern part of the CAOB based on analysis of geological and new Ar‒Ar dating data on feldspars from mafic intrusions. As a result, the chronology of the previously known stages of postmagmatic processes manifested in the Tuvinian trough was refined and new stages identified according to the tectonic evolution of the CAOB. Ar‒Ar dating of feldspars from eight samples yielded four age groups: (i) Late Devonian, (ii) Middle Carboniferous, (iii) Early Permian, and (iv) Early Jurassic. Late Devonian (~377 and 375 Ma) ages record an impulse of mafic magmatism, widely manifested in the northern segments of the CAOB (~380‒365 Ma). 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Dating of accessory and rock-forming minerals from igneous rocks using low-temperature geochronology methods yields additional information about postmagmatic processes, making it possible to update the regional tectonic evolution model. In this study, we have reconstructed the stages of tectonic development of the Tuvinian trough in the northern part of the CAOB based on analysis of geological and new Ar‒Ar dating data on feldspars from mafic intrusions. As a result, the chronology of the previously known stages of postmagmatic processes manifested in the Tuvinian trough was refined and new stages identified according to the tectonic evolution of the CAOB. Ar‒Ar dating of feldspars from eight samples yielded four age groups: (i) Late Devonian, (ii) Middle Carboniferous, (iii) Early Permian, and (iv) Early Jurassic. Late Devonian (~377 and 375 Ma) ages record an impulse of mafic magmatism, widely manifested in the northern segments of the CAOB (~380‒365 Ma). Middle Carboniferous (~320 and 319 Ma) dates may reflect closure of the Ob–Zaisan branch of the Paleo-Asian ocean as a result of the Kazakhstan–Siberian collision. Early Permian (~290–279 Ma) ages are consistent with the formation of Late Carboniferous–Early Permian (~305–275 Ma) large igneous provinces in connection with rifting processes in the northern segments of the CAOB. 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A.</au><au>Agatova, A. R.</au><au>Gavryushkina, O. A.</au><au>Bulgakova, D. D.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Tectonic Evolution of the Tuvinian Trough (Northern Part of Central Asian Orogenic Belt): Synthesis of Geological Data and Results of Feldspar Ar‒Ar Dating</atitle><jtitle>Geotectonics</jtitle><stitle>Geotecton</stitle><date>2024-08-01</date><risdate>2024</risdate><volume>58</volume><issue>4</issue><spage>449</spage><epage>464</epage><pages>449-464</pages><issn>0016-8521</issn><eissn>1556-1976</eissn><abstract>The Tuvinian rift trough, located in the northern part of the Central Asian orogenic belt (CAOB), arose in the Early Devonian on Late Proterozoic (?)‒Early Paleozoic terranes as a result of Altai–Sayan mantle plume activity. The sedimentary record from the Middle Paleozoic to the Middle Mesozoic, preserved in the Tuvinian trough, and the Middle Paleozoic igneous complexes confined to the trough structures, reflect the evolutionary stages of Earth’s crust in the Tuva segment necessary for understanding the geological history of the CAOB as a whole. Dating of accessory and rock-forming minerals from igneous rocks using low-temperature geochronology methods yields additional information about postmagmatic processes, making it possible to update the regional tectonic evolution model. In this study, we have reconstructed the stages of tectonic development of the Tuvinian trough in the northern part of the CAOB based on analysis of geological and new Ar‒Ar dating data on feldspars from mafic intrusions. As a result, the chronology of the previously known stages of postmagmatic processes manifested in the Tuvinian trough was refined and new stages identified according to the tectonic evolution of the CAOB. Ar‒Ar dating of feldspars from eight samples yielded four age groups: (i) Late Devonian, (ii) Middle Carboniferous, (iii) Early Permian, and (iv) Early Jurassic. Late Devonian (~377 and 375 Ma) ages record an impulse of mafic magmatism, widely manifested in the northern segments of the CAOB (~380‒365 Ma). Middle Carboniferous (~320 and 319 Ma) dates may reflect closure of the Ob–Zaisan branch of the Paleo-Asian ocean as a result of the Kazakhstan–Siberian collision. Early Permian (~290–279 Ma) ages are consistent with the formation of Late Carboniferous–Early Permian (~305–275 Ma) large igneous provinces in connection with rifting processes in the northern segments of the CAOB. Lastly, a single Early Jurassic (~188 Ma) age marks tectonic reorganization of the CAOB in the Late Triassic‒Early Jurassic in response to (i) closure of the Paleotethys Ocean with subsequent collision of Cimmerian blocks and the southern margin of the Eurasian continent and/or (ii) Mongolian mantle plume activity.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S0016852124700328</doi><tpages>16</tpages></addata></record>
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ispartof Geotectonics, 2024-08, Vol.58 (4), p.449-464
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subjects Age groups
Carboniferous
Chronology
Dating
Developmental stages
Devonian
Earth and Environmental Science
Earth mantle
Earth Sciences
Evolution
Feldspars
Geochronology
Geochronometry
Geological data
Geological history
Geology
Igneous rocks
Information processing
Jurassic
Low temperature
Magma
Mantle plumes
Mesozoic
Oceans
Orogeny
Paleozoic
Permian
Precambrian
Regional development
Rifting
Segments
Structural Geology
Tectonics
Triassic
title Tectonic Evolution of the Tuvinian Trough (Northern Part of Central Asian Orogenic Belt): Synthesis of Geological Data and Results of Feldspar Ar‒Ar Dating
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