Инд. авторы:	Polyansky O.P., Kargopolov S.A., Babichev A.V., Reverdatto V.V.
Заглавие:	High-Grade Metamorphism and Anatexis in the Teletskoe-Chulyshman Belt (Gorny Altai): U-Pb Geochronology, P-T Estimates, and Thermal Tectonic Model
Библ. ссылка:	Polyansky O.P., Kargopolov S.A., Babichev A.V., Reverdatto V.V. High-Grade Metamorphism and Anatexis in the Teletskoe-Chulyshman Belt (Gorny Altai): U-Pb Geochronology, P-T Estimates, and Thermal Tectonic Model // Russian Geology and Geophysics. - 2019. - Vol.60. - Iss. 12. - P.1425-1443. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.15372/RGG2019108; WoS: 000503994500006;
Реферат:	eng: A model of the formation of the Teletskoe-Chulyshman metamorphic belt (TCMB) in Gorey Altai has been elaborated. The estimated pressure (not exceeding 3-4 kbar) and temperature (about 740 degrees C) indicate an increased regional crustal thermal gradient equal to 60-90 degrees C/km during the formation of the metamorphic belt. The age of migmatites of the Chulyshman complex has been evaluated at 483.9 +/- 5.7 Ma (Early Ordovician) by U/Pb (SHRIMP) zircon dating. The paleogeodynamic setting of the TCMB formation and the protolith nature are identified based on the geochemical and petrochemical parameters of the metamorphic rocks. Structural parameters and numerical modeling show that the Chulyshman migmatite-gneiss complex is an apical part of the thermal-dome structure formed under the thermal impact of a magmatic basic heat source in the base of the crust and displaced to the relevant depths via thrusts and crustal extrusion during the Early Ordovician accretion-collision event. Matching the metamorphism parameters and the numerical-modeling results for the crustal thermal regime, we determined the rate of the anatectic front displacement along the thrust to be at least 6 cm/yr.
Ключевые слова:	CONSTRAINTS; REGION; MANTLE; GRANITE; GEODYNAMICS; CRUSTAL; EVOLUTION; SAYAN; Gorny Altai; Teletskoe-Chulyshman metamorphic belt; high-temperature/low-pressure metamorphism; U/Pb age; thermal tectonic model; P-T parameters; META-SEDIMENTARY ROCKS; PROVENANCE;
Издано:	2019
Физ. характеристика:	с.1425-1443