Russian Journal of Earth Sciences Russian Journal of Earth Sciences Russian Journal of Earth Sciences 1681-1208 47043 ОРИГИНАЛЬНЫЕ СТАТЬИ ORIGINAL ARTICLES ОРИГИНАЛЬНЫЕ СТАТЬИ The composition, genesis, and mantle xenoliths of the Late Miocene fergusite-carbonatite-syenite series of the Pamir: The problem of superthick crust formation in mobile belts The composition, genesis, and mantle xenoliths of the Late Miocene fergusite-carbonatite-syenite series of the Pamir: The problem of superthick crust formation in mobile belts Lutkov B S Lutkov B S Babaev A M Babaev A M Dmitriev E A Dmitriev E A Mogarovskii V V Mogarovskii V V Minaev V E Minaev V E Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru Institute of Geology of the Tajik Academy of Science, Dushanbe, Tajikistan ru 7 1 35 50 10 11 2021 https://rjes.ru/en/nauka/article/47043/view

The aim of this paper is to offer the geostructural and petrochemical characteristics of the diatremes and dykes of the Late Miocene fergusite-carbonatite-syenite series and of the mantle xenoliths. The evidence obtained in this study for the petrogeochemistry of the subvolcanic bodies and for the composition and thermobarometry of their mantle and crustal inclusions allowed us to clarify the conditions of magma intrusion and differentiation, as well as the depths and types of the potential sources of the ultrapotassic alkali-basic magmas. Models are offered for the formation of a superthick crust and a newly formed pyroxenite-eclogite upper mantle under the Pamir region. The tectonic positions of the Late Miocene rock bodies and their formation analysis proved their association with the post-collision conditions. A view is advanced that the horizontal displacement of the Pamir at least of its eastern block, as well as the formation of its modern structural style, associated with the India-Asia collision, was completed in the Late Miocene.

The aim of this paper is to offer the geostructural and petrochemical characteristics of the diatremes and dykes of the Late Miocene fergusite-carbonatite-syenite series and of the mantle xenoliths. The evidence obtained in this study for the petrogeochemistry of the subvolcanic bodies and for the composition and thermobarometry of their mantle and crustal inclusions allowed us to clarify the conditions of magma intrusion and differentiation, as well as the depths and types of the potential sources of the ultrapotassic alkali-basic magmas. Models are offered for the formation of a superthick crust and a newly formed pyroxenite-eclogite upper mantle under the Pamir region. The tectonic positions of the Late Miocene rock bodies and their formation analysis proved their association with the post-collision conditions. A view is advanced that the horizontal displacement of the Pamir at least of its eastern block, as well as the formation of its modern structural style, associated with the India-Asia collision, was completed in the Late Miocene.

 Late Miocene composition genesis mantle xenoliths fergusite-carbonatite-syenite series mobile belts Pamir Late Miocene composition genesis mantle xenoliths fergusite-carbonatite-syenite series mobile belts Pamir

Babaev, The Recent Tectogenesis of the Gissar-Alai Range and Tajik Depression Connection Zone, 1975. Babaev, The Recent Tectogenesis of the Gissar-Alai Range and Tajik Depression Connection Zone, 1975. Babaev, The Block Structure and Faults in Geosynclinal Areas, 1984. Babaev, The Block Structure and Faults in Geosynclinal Areas, 1984. Babaev, Proc. Tajik Acad. Sci., Earth Sci. Series, no. 3, 1993. Babaev, Proc. Tajik Acad. Sci., Earth Sci. Series, no. 3, 1993. Baratov, Petrology and Geochemistry of Igneous Rocks in the Pamir and Gissar-Alai Regions, 1978. Baratov, Petrology and Geochemistry of Igneous Rocks in the Pamir and Gissar-Alai Regions, 1978. Belousov, The Crustal and Upper Mantle Structure of the Pamir, Himalaii, and South Tien Shan, 1984. Belousov, The Crustal and Upper Mantle Structure of the Pamir, Himalaii, and South Tien Shan, 1984. Bogatikov, Lamproites, 1991. Bogatikov, Lamproites, 1991. Borodin, Petrology and Geochemistry of Alkaline-Ultrabasic Dikes and Kimberlites, 1976. Borodin, Petrology and Geochemistry of Alkaline-Ultrabasic Dikes and Kimberlites, 1976. Budanov, Evolution of Intracontinental Mobile Belts, 2003. Budanov, Evolution of Intracontinental Mobile Belts, 2003. Budanova, Metamorphic Rocks of Tajikistan, 1991. Budanova, Metamorphic Rocks of Tajikistan, 1991. Carswell, Contrib. Mineral. Petrol., v. 74, 1980. Carswell, Contrib. Mineral. Petrol., v. 74, 1980. Chediya, Tien Shan Morphostructures and Recent Tectogenesis, 1986. Chediya, Tien Shan Morphostructures and Recent Tectogenesis, 1986. Chupin, 14 European Current Research on fluid inclusions, 1997. Chupin, 14 European Current Research on fluid inclusions, 1997. Dmitriev, Cenozoic Potassic Alkaline Rocks of East Pamir, 1976. Dmitriev, Cenozoic Potassic Alkaline Rocks of East Pamir, 1976. Dmitriev, Dokl. Akad. Nauk SSSR, v. 272, no. 2, 1983. Dmitriev, Dokl. Akad. Nauk SSSR, v. 272, no. 2, 1983. Dobretsov, Crustal Geodynamics, 2001. Dobretsov, Crustal Geodynamics, 2001. Ducea, Geology, v. 31, no. 10, 2003., doi: 10.1130/G19707.1 Ducea, Geology, v. 31, no. 10, 2003., doi: 10.1130/G19707.1 Duchkov, Geodynamics and Geoecologic Problems in High Mountain Regions, 2002. Duchkov, Geodynamics and Geoecologic Problems in High Mountain Regions, 2002. East African Rift System, East African Rift System, vol. 3, 1974. East African Rift System, East African Rift System, vol. 3, 1974. England, Geophys. J. Int., v. 130, 1997. England, Geophys. J. Int., v. 130, 1997. Faiziev, Trace Elements as Indicators of Fluorite Genesis, 2002. Faiziev, Trace Elements as Indicators of Fluorite Genesis, 2002. Faiziev, Thermobarogeochemistry of Geological Processes, 1992. Faiziev, Thermobarogeochemistry of Geological Processes, 1992. France-Lanord, Trans. R. Soc. Edinburgh Earth Sci., v. 79, no. 2-3, 1988. France-Lanord, Trans. R. Soc. Edinburgh Earth Sci., v. 79, no. 2-3, 1988. Geological Evolution..., Geological Evolution of the Karakorum and Kunlun Mountains, 1996. Geological Evolution..., Geological Evolution of the Karakorum and Kunlun Mountains, 1996. Grachev, Rift Zones of the Earth, 2nd revised and enlarged edition, 1987. Grachev, Rift Zones of the Earth, 2nd revised and enlarged edition, 1987. Grachev, Recent Tectonics, Geodynamics, and Seismicity of Northern Eurasia, 2000. Grachev, Recent Tectonics, Geodynamics, and Seismicity of Northern Eurasia, 2000. Grachev, Tectonics and Geophysics of the Lithosphere, vol. 1, 2002. Grachev, Tectonics and Geophysics of the Lithosphere, vol. 1, 2002. Grachev, Physics of the Earth, no. 4, 2002. Grachev, Physics of the Earth, no. 4, 2002. Grachev, Physics of the Earth, no. 10, 1999. Grachev, Physics of the Earth, no. 10, 1999. Hacker, Science, v. 287, 2000., doi: 10.1126/science.287.5462.2463 Hacker, Science, v. 287, 2000., doi: 10.1126/science.287.5462.2463 Hodges, Philos. Trans. R. Soc. London, v. 326, no. 1589, 1988., doi: 10.1098/rsta.1988.0087 Hodges, Philos. Trans. R. Soc. London, v. 326, no. 1589, 1988., doi: 10.1098/rsta.1988.0087 Jagoutz, Geochim. Cosmochim. Acta, v. 11, 1979. Jagoutz, Geochim. Cosmochim. Acta, v. 11, 1979. Khain, Tectonics and Geophysics of the Lithosphere, 2002. Khain, Tectonics and Geophysics of the Lithosphere, 2002. Kogarko, Conditions of Zircon Concentration in Magmatic Processes, 1988. Kogarko, Conditions of Zircon Concentration in Magmatic Processes, 1988. Kovalenko, Igneous Rocks: Evolution of Magmatism in the Earth's History, 1987. Kovalenko, Igneous Rocks: Evolution of Magmatism in the Earth's History, 1987. Lloyd, Contrib. Mineral. Petrol., v. 91, no. 4, 1985., doi: 10.1007/BF00374688 Lloyd, Contrib. Mineral. Petrol., v. 91, no. 4, 1985., doi: 10.1007/BF00374688 Lukina, Correlation of Tectonic Events during the Recent Evolution of the Earth, 1985. Lukina, Correlation of Tectonic Events during the Recent Evolution of the Earth, 1985. Lutkov, Geochemistry, no. 3, 2000. Lutkov, Geochemistry, no. 3, 2000. Lutkov, Geochemistry, no. 3, 2003. Lutkov, Geochemistry, no. 3, 2003. Lutkov, Lithospheric Section across the South Pamir Cimmerian Alpides: Mantle and Lower Crust Inclusions in Neogene Alkalic Basic Rocks, 1998. Lutkov, Lithospheric Section across the South Pamir Cimmerian Alpides: Mantle and Lower Crust Inclusions in Neogene Alkalic Basic Rocks, 1998. Lutkov, The Geochemical Evolution of Granitoids in the Lithosphere History, 1993. Lutkov, The Geochemical Evolution of Granitoids in the Lithosphere History, 1993. Lutkov, Geochemistry, no. 6, 1999. Lutkov, Geochemistry, no. 6, 1999. Lutkov, Dokl. Acad. Nauk, v. 391, no. 4, 2003. Lutkov, Dokl. Acad. Nauk, v. 391, no. 4, 2003. Lutkov, Geochemistry, no. 4, 2002. Lutkov, Geochemistry, no. 4, 2002. Luts, Geochemistry of Oceanic and Continental Magmatism, 1980. Luts, Geochemistry of Oceanic and Continental Magmatism, 1980. Meschede, Chem. Geol., v. 56, 1986., doi: 10.1016/0009-25418690004-5 Meschede, Chem. Geol., v. 56, 1986., doi: 10.1016/0009-25418690004-5 Mogarovskii, Dokl. Tadzhik Akad. Nauk, v. 18, no. 11, 1975. Mogarovskii, Dokl. Tadzhik Akad. Nauk, v. 18, no. 11, 1975. Mogarovskii, Dokl. Tadzhik Acad. Nauk, v. 39, no. 7-8, 1996. Mogarovskii, Dokl. Tadzhik Acad. Nauk, v. 39, no. 7-8, 1996. Nikolaev, Recent Tectonics and Geodynamics of the Lithosphere, 1988. Nikolaev, Recent Tectonics and Geodynamics of the Lithosphere, 1988. Pavlov, Petrography of Tajikistan Rocks, vol. 2, 1988. Pavlov, Petrography of Tajikistan Rocks, vol. 2, 1988. Pearce, Contrib. Mineral. Petrol., v. 69, 1979., doi: 10.1007/BF00375192 Pearce, Contrib. Mineral. Petrol., v. 69, 1979., doi: 10.1007/BF00375192 Pevnev, Recent Crustal Movements: Measurements at Geodynamic Sites, 1978. Pevnev, Recent Crustal Movements: Measurements at Geodynamic Sites, 1978. Pogrebnoi, Geology and Geophysics, v. 42, no. 10, 2001. Pogrebnoi, Geology and Geophysics, v. 42, no. 10, 2001. Pollack, Tectonophysics, v. 38, 1977., doi: 10.1016/0040-19517790215-3 Pollack, Tectonophysics, v. 38, 1977., doi: 10.1016/0040-19517790215-3 Puzankov, Geol. Geofiz., v. 41, no. 5, 2000. Puzankov, Geol. Geofiz., v. 41, no. 5, 2000. Ringwood, Composition and Petrology of the Earth Mantle, 1981. Ringwood, Composition and Petrology of the Earth Mantle, 1981. Sharygin, Geol. Geofiz., v. 35, no. 1, 1994. Sharygin, Geol. Geofiz., v. 35, no. 1, 1994. Solovova, Petrologiya, v. 4, no. 4, 1996. Solovova, Petrologiya, v. 4, no. 4, 1996. Venke, Archean Geochemistry, 1987. Venke, Archean Geochemistry, 1987. Vladimirov, Indosinian Igneous Activity and Geodynamics of the South Pamir Region, 1992. Vladimirov, Indosinian Igneous Activity and Geodynamics of the South Pamir Region, 1992. Yarmolyuk, Geotectonika, no. 5, 2000. Yarmolyuk, Geotectonika, no. 5, 2000.