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Deng Yan - One of the best experts on this subject based on the ideXlab platform.
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Lithospheric Structure of western tibet a brief review
Journal of Asian Earth Sciences, 2020Co-Authors: Junmeng Zhao, Bhupati Neupane, Hongbing Liu, Deng YanAbstract:Abstract Over the course of the last hundred years or so, there have been countless seismic experiments conducted under the aegis of different research programs, which have aimed to investigate the Structure of the crust and uppermost mantle of the western Tibetan Plateau. However, there have been fewer detailed lithographic studies of the western sector of the Tibetan Plateau, and those that have been conducted have principally fallen under the research umbrella of the ANTILOPE (Array Network of Tibetan International Lithospheric Observation and Probe Experiments). In this paper, we summarize the important research findings that have been gathered using comprehensive geophysical profiles, and provide an overall view of the Lithospheric Structure of the western Tibetan Plateau that has resulted from the onset of tectonic collision and the continuous convergence of the Indian and Eurasian plates since ~65 Ma ago. In western Tibet, the subducted Indian Lithospheric mantle is moving towards the northern edge of the Plateau, colliding with the Tarim Basin at 80°E. However, the Tarim Basin shows different nature of subductions in eastern, central and western regions itself. The maximum Moho depth (~93 km) beneath the Qiangtang Terrane marks the northern margin of the decoupled underthrusting Indian Plate’s lower crust and the Lithospheric mantle. The broader, stronger terrain of the western Tibetan Plateau may indicate an eastward-broadening shape and a lower Cenozoic shortening, and the relatively larger width of the Lhasa-Qiangtang terranes may be a key factor controlling the geodynamic evolution of the Tibetan Plateau.
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Lithospheric Structure of western Tibet – A brief review
Journal of Asian Earth Sciences, 2020Co-Authors: Junmeng Zhao, Bhupati Neupane, Hongbing Liu, Deng YanAbstract:Abstract Over the course of the last hundred years or so, there have been countless seismic experiments conducted under the aegis of different research programs, which have aimed to investigate the Structure of the crust and uppermost mantle of the western Tibetan Plateau. However, there have been fewer detailed lithographic studies of the western sector of the Tibetan Plateau, and those that have been conducted have principally fallen under the research umbrella of the ANTILOPE (Array Network of Tibetan International Lithospheric Observation and Probe Experiments). In this paper, we summarize the important research findings that have been gathered using comprehensive geophysical profiles, and provide an overall view of the Lithospheric Structure of the western Tibetan Plateau that has resulted from the onset of tectonic collision and the continuous convergence of the Indian and Eurasian plates since ~65 Ma ago. In western Tibet, the subducted Indian Lithospheric mantle is moving towards the northern edge of the Plateau, colliding with the Tarim Basin at 80°E. However, the Tarim Basin shows different nature of subductions in eastern, central and western regions itself. The maximum Moho depth (~93 km) beneath the Qiangtang Terrane marks the northern margin of the decoupled underthrusting Indian Plate’s lower crust and the Lithospheric mantle. The broader, stronger terrain of the western Tibetan Plateau may indicate an eastward-broadening shape and a lower Cenozoic shortening, and the relatively larger width of the Lhasa-Qiangtang terranes may be a key factor controlling the geodynamic evolution of the Tibetan Plateau.
J. Yliniemi - One of the best experts on this subject based on the ideXlab platform.
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Lithospheric Structure beneath trans‐Carpathian transect from Precambrian platform to Pannonian basin: CELEBRATION 2000 seismic profile CEL05
Journal of Geophysical Research, 2006Co-Authors: Marek Grad, Aleksander Guterch, G. Randy Keller, Tomasz Janik, Endre Hegedűs, Jozef Vozár, Andrzej Ślączka, Timo Tiira, J. YliniemiAbstract:[1] In 2000, a consortium of European and North American institutions completed a huge active source seismic experiment focused on central Europe, the Central European Lithospheric Experiment Based on Refraction or CELEBRATION 2000. This experiment primarily consisted of a network of seismic refraction profiles that extended from the East European craton, along and across the Trans-European suture zone region in Poland to the Bohemian massif, and through the Carpathians and eastern Alps to the Pannonian basin. The longest profile CEL05 (1420 km) is the focus of this paper. The resulting two-dimensional tomographic and ray-tracing models show strong variations in crustal and lower Lithospheric Structure. Clear crustal thickening from the Pannonian basin (24–25 km thick) to the Trans-European suture zone region (∼50 km), together with the configuration of the lower Lithospheric reflectors, suggests northward subduction of mantle underlying Carpathian-Pannonian plate under the European plate. This, however, conflicts with strong geological evidence for southward subduction, and we present three tectonic models that are to not totally mutually exclusive, to explain the Lithospheric Structure of the area: (1) northward “old” subduction of the Pannonian lithosphere under the East European craton in the Jurassic–Lower Cretaceous, (2) a collisional zone containing a “crocodile” Structure where Carpatho-Pannonian upper crust is obducting over the crystalline crust of the East European craton and the Carpathian-Pannonian mantle lithosphere is underthrusting cratonic lower crust, and (3) lithosphere thinning due to the effects of Neogene extension and heating with the slab associated with “young” subduction southward in the Miocene having been either detached and/or rolled back to the east. In the last case, the northwestward dipping in the lithosphere can be interpreted as being due to isotherms that could represent the lithosphere/asthenosphere boundary in the Pannonian region.
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Lithospheric Structure beneath trans carpathian transect from precambrian platform to pannonian basin celebration 2000 seismic profile cel05
Journal of Geophysical Research, 2006Co-Authors: Marek Grad, Aleksander Guterch, Tomasz Janik, Endre Hegedűs, Jozef Vozár, Timo Tiira, Randy G Keller, Andrzej ślączka, J. YliniemiAbstract:[1] In 2000, a consortium of European and North American institutions completed a huge active source seismic experiment focused on central Europe, the Central European Lithospheric Experiment Based on Refraction or CELEBRATION 2000. This experiment primarily consisted of a network of seismic refraction profiles that extended from the East European craton, along and across the Trans-European suture zone region in Poland to the Bohemian massif, and through the Carpathians and eastern Alps to the Pannonian basin. The longest profile CEL05 (1420 km) is the focus of this paper. The resulting two-dimensional tomographic and ray-tracing models show strong variations in crustal and lower Lithospheric Structure. Clear crustal thickening from the Pannonian basin (24–25 km thick) to the Trans-European suture zone region (∼50 km), together with the configuration of the lower Lithospheric reflectors, suggests northward subduction of mantle underlying Carpathian-Pannonian plate under the European plate. This, however, conflicts with strong geological evidence for southward subduction, and we present three tectonic models that are to not totally mutually exclusive, to explain the Lithospheric Structure of the area: (1) northward “old” subduction of the Pannonian lithosphere under the East European craton in the Jurassic–Lower Cretaceous, (2) a collisional zone containing a “crocodile” Structure where Carpatho-Pannonian upper crust is obducting over the crystalline crust of the East European craton and the Carpathian-Pannonian mantle lithosphere is underthrusting cratonic lower crust, and (3) lithosphere thinning due to the effects of Neogene extension and heating with the slab associated with “young” subduction southward in the Miocene having been either detached and/or rolled back to the east. In the last case, the northwestward dipping in the lithosphere can be interpreted as being due to isotherms that could represent the lithosphere/asthenosphere boundary in the Pannonian region.
Junmeng Zhao - One of the best experts on this subject based on the ideXlab platform.
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Lithospheric Structure of western tibet a brief review
Journal of Asian Earth Sciences, 2020Co-Authors: Junmeng Zhao, Bhupati Neupane, Hongbing Liu, Deng YanAbstract:Abstract Over the course of the last hundred years or so, there have been countless seismic experiments conducted under the aegis of different research programs, which have aimed to investigate the Structure of the crust and uppermost mantle of the western Tibetan Plateau. However, there have been fewer detailed lithographic studies of the western sector of the Tibetan Plateau, and those that have been conducted have principally fallen under the research umbrella of the ANTILOPE (Array Network of Tibetan International Lithospheric Observation and Probe Experiments). In this paper, we summarize the important research findings that have been gathered using comprehensive geophysical profiles, and provide an overall view of the Lithospheric Structure of the western Tibetan Plateau that has resulted from the onset of tectonic collision and the continuous convergence of the Indian and Eurasian plates since ~65 Ma ago. In western Tibet, the subducted Indian Lithospheric mantle is moving towards the northern edge of the Plateau, colliding with the Tarim Basin at 80°E. However, the Tarim Basin shows different nature of subductions in eastern, central and western regions itself. The maximum Moho depth (~93 km) beneath the Qiangtang Terrane marks the northern margin of the decoupled underthrusting Indian Plate’s lower crust and the Lithospheric mantle. The broader, stronger terrain of the western Tibetan Plateau may indicate an eastward-broadening shape and a lower Cenozoic shortening, and the relatively larger width of the Lhasa-Qiangtang terranes may be a key factor controlling the geodynamic evolution of the Tibetan Plateau.
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Lithospheric Structure of western Tibet – A brief review
Journal of Asian Earth Sciences, 2020Co-Authors: Junmeng Zhao, Bhupati Neupane, Hongbing Liu, Deng YanAbstract:Abstract Over the course of the last hundred years or so, there have been countless seismic experiments conducted under the aegis of different research programs, which have aimed to investigate the Structure of the crust and uppermost mantle of the western Tibetan Plateau. However, there have been fewer detailed lithographic studies of the western sector of the Tibetan Plateau, and those that have been conducted have principally fallen under the research umbrella of the ANTILOPE (Array Network of Tibetan International Lithospheric Observation and Probe Experiments). In this paper, we summarize the important research findings that have been gathered using comprehensive geophysical profiles, and provide an overall view of the Lithospheric Structure of the western Tibetan Plateau that has resulted from the onset of tectonic collision and the continuous convergence of the Indian and Eurasian plates since ~65 Ma ago. In western Tibet, the subducted Indian Lithospheric mantle is moving towards the northern edge of the Plateau, colliding with the Tarim Basin at 80°E. However, the Tarim Basin shows different nature of subductions in eastern, central and western regions itself. The maximum Moho depth (~93 km) beneath the Qiangtang Terrane marks the northern margin of the decoupled underthrusting Indian Plate’s lower crust and the Lithospheric mantle. The broader, stronger terrain of the western Tibetan Plateau may indicate an eastward-broadening shape and a lower Cenozoic shortening, and the relatively larger width of the Lhasa-Qiangtang terranes may be a key factor controlling the geodynamic evolution of the Tibetan Plateau.
Marek Grad - One of the best experts on this subject based on the ideXlab platform.
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Lithospheric Structure of the western part of the East European Craton investigated by deep seismic profiles
Geological Quarterly, 2010Co-Authors: Marek Grad, Aleksander Guterch, Tomasz Janik, Piotr Środa, Wojciech CzubaAbstract:The Palaeoproterozoic collision of Archaean Fennoscandia, Volgo-Uralia and Sarmatia, viewed as a large composite of terranes, each with an independent history during Archaean and Early Proterozoic time, formed the East European Craton. This paper summarizes the results of deep seismic sounding investigations of the Lithospheric Structure of the southwestern part of the East European Craton. On the basis of the modern EUROBRIDGE'94-97, POLONAISE'97 and CELEBRATION 2000 projects, as well as of data from the Coast Profile and from reinterpreted profiles VIII and XXIV, the main tectonic units of Fennoscandia and Sarmatia are characterized. The crustal thickness in the whole area investigated is relatively uniform, being between 40 and 50 km (maximum about 55 km). For Fennoscandia, the crystalline crust of the craton can be generally divided into three parts, while in Sarmatia the transition between the middle and lower crust is smooth. For both areas, relatively high P-wave velocities (l 7.0 km/s) were observed in the lower crust. Relatively high seismic velocities of the sub-Moho mantle (~8.2-8.3 km/s) were observed along most of the profiles. The uppermost mantle reflectors often occur ca. 10 to 15 km below the Moho. Finally, we show the variability in physical properties for the major geological domains of Fennoscandia and Sarmatia, which were crossed by the network of our profiles.
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Lithospheric Structure beneath trans‐Carpathian transect from Precambrian platform to Pannonian basin: CELEBRATION 2000 seismic profile CEL05
Journal of Geophysical Research, 2006Co-Authors: Marek Grad, Aleksander Guterch, G. Randy Keller, Tomasz Janik, Endre Hegedűs, Jozef Vozár, Andrzej Ślączka, Timo Tiira, J. YliniemiAbstract:[1] In 2000, a consortium of European and North American institutions completed a huge active source seismic experiment focused on central Europe, the Central European Lithospheric Experiment Based on Refraction or CELEBRATION 2000. This experiment primarily consisted of a network of seismic refraction profiles that extended from the East European craton, along and across the Trans-European suture zone region in Poland to the Bohemian massif, and through the Carpathians and eastern Alps to the Pannonian basin. The longest profile CEL05 (1420 km) is the focus of this paper. The resulting two-dimensional tomographic and ray-tracing models show strong variations in crustal and lower Lithospheric Structure. Clear crustal thickening from the Pannonian basin (24–25 km thick) to the Trans-European suture zone region (∼50 km), together with the configuration of the lower Lithospheric reflectors, suggests northward subduction of mantle underlying Carpathian-Pannonian plate under the European plate. This, however, conflicts with strong geological evidence for southward subduction, and we present three tectonic models that are to not totally mutually exclusive, to explain the Lithospheric Structure of the area: (1) northward “old” subduction of the Pannonian lithosphere under the East European craton in the Jurassic–Lower Cretaceous, (2) a collisional zone containing a “crocodile” Structure where Carpatho-Pannonian upper crust is obducting over the crystalline crust of the East European craton and the Carpathian-Pannonian mantle lithosphere is underthrusting cratonic lower crust, and (3) lithosphere thinning due to the effects of Neogene extension and heating with the slab associated with “young” subduction southward in the Miocene having been either detached and/or rolled back to the east. In the last case, the northwestward dipping in the lithosphere can be interpreted as being due to isotherms that could represent the lithosphere/asthenosphere boundary in the Pannonian region.
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Lithospheric Structure beneath trans carpathian transect from precambrian platform to pannonian basin celebration 2000 seismic profile cel05
Journal of Geophysical Research, 2006Co-Authors: Marek Grad, Aleksander Guterch, Tomasz Janik, Endre Hegedűs, Jozef Vozár, Timo Tiira, Randy G Keller, Andrzej ślączka, J. YliniemiAbstract:[1] In 2000, a consortium of European and North American institutions completed a huge active source seismic experiment focused on central Europe, the Central European Lithospheric Experiment Based on Refraction or CELEBRATION 2000. This experiment primarily consisted of a network of seismic refraction profiles that extended from the East European craton, along and across the Trans-European suture zone region in Poland to the Bohemian massif, and through the Carpathians and eastern Alps to the Pannonian basin. The longest profile CEL05 (1420 km) is the focus of this paper. The resulting two-dimensional tomographic and ray-tracing models show strong variations in crustal and lower Lithospheric Structure. Clear crustal thickening from the Pannonian basin (24–25 km thick) to the Trans-European suture zone region (∼50 km), together with the configuration of the lower Lithospheric reflectors, suggests northward subduction of mantle underlying Carpathian-Pannonian plate under the European plate. This, however, conflicts with strong geological evidence for southward subduction, and we present three tectonic models that are to not totally mutually exclusive, to explain the Lithospheric Structure of the area: (1) northward “old” subduction of the Pannonian lithosphere under the East European craton in the Jurassic–Lower Cretaceous, (2) a collisional zone containing a “crocodile” Structure where Carpatho-Pannonian upper crust is obducting over the crystalline crust of the East European craton and the Carpathian-Pannonian mantle lithosphere is underthrusting cratonic lower crust, and (3) lithosphere thinning due to the effects of Neogene extension and heating with the slab associated with “young” subduction southward in the Miocene having been either detached and/or rolled back to the east. In the last case, the northwestward dipping in the lithosphere can be interpreted as being due to isotherms that could represent the lithosphere/asthenosphere boundary in the Pannonian region.
Hakan Çınar - One of the best experts on this subject based on the ideXlab platform.
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The Lithospheric Structure underneath the Circum Black Sea: Teleseismic receiver functions and Rayleigh wave phase velocity analysis
Journal of Asian Earth Sciences, 2021Co-Authors: Hamdi Alkan, Hakan ÇınarAbstract:Abstract In this paper, the Lithospheric Structure underneath the Circum Black Sea is investigated on the basis of teleseismic receiver functions and Rayleigh wave phase velocity analyses. A joint inversion of P- and S-wave receiver functions are performed by using an iterative algorithm, similar to the simulated annealing method. The array method is employed to obtain the Rayleigh wave inter-station phase velocity dispersion curves. The dataset recorded during 2010–2020 by sixteen broadband stations, operated by several seismological agencies, includes more than 450 events (Mw ≥ 5.8). The Moho depth increases northward from 35 km to 40 km along both coastlines. Following the velocity models, it is suggested that the crust Structure beneath the stations is the continental type. The lithosphere-asthenosphere boundary ranges from ~ 90 km to ~ 120 km from the east coast of the East Black Sea basin, while it is low-sloping (from ~ 100 km to ~ 93 km) for the west coast of the West Black Sea basin, and it is nearly 90 km along with the Pontides. The average P-wave and S-wave velocities inferred from the models indicate the continental lithosphere around the Black Sea coastal region. According to these results, tectonically, it points out that the southward subduction exists in the eastern part of the East Black Sea region beneath the Pontides, while it is not observed in the westernmost Black Sea region.