Инд. авторы:	Tsygankov A.A., Burmakina G.N., Yakovlev V.A., Khubanov V.B., Vladimirov V.G., Karmysheva I.V., Buyantuev M.D.
Заглавие:	Composition and U-Pb (LA-ICP-MS) Isotopic Age of Zircons from Composite Dikes of Western Sangilen (Tuva-Mongolian Orogen)
Библ. ссылка:	Tsygankov A.A., Burmakina G.N., Yakovlev V.A., Khubanov V.B., Vladimirov V.G., Karmysheva I.V., Buyantuev M.D. Composition and U-Pb (LA-ICP-MS) Isotopic Age of Zircons from Composite Dikes of Western Sangilen (Tuva-Mongolian Orogen) // Russian Geology and Geophysics. - 2019. - Vol.60. - Iss. 1. - P.45-66. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.15372/RGG2019004; WoS: 000458351200004;
Реферат:	eng: Composite dikes (mingling dikes) of Western Sangilen (southeastern Tuva) are believed to indicate a shift from tectonic contraction, related to the mountain fold system formation, to postcollisional extension that ended with the disintegration of the collisional orogen. However, the position of composite dikes in the general sequence of magmatic events was based only on their geologic location and has not been confirmed by U/Pb isotope-geochronological data. The proposed study is concerned with the geologic structure, composition, and isotopic age (485-490 Ma) of West Sangilen composite dikes. The isotopic age of the host granites from the Matut pluton is 509 Ma; thermal events of Riphean (679-934 Ma) and early Paleozoic (484 Ma) age are reflected in zircons from gneiss-granites of the Erzin metamorphic complex. The obtained data are consistent with the earlier detennined sequences of West Sangilen tectonometamorphic events. Basites from the examined composite dik e s are strongly different in the contents of indicator elements (Rb, Nb, Ta, Zr, and HO and the Nb/Y, Zr/Y, Th/Ta, Zr/Nb, and Nb/Th ratios, which is indicative of different (probably, different-depth) mantle sources. The protolith of the salic component of the composite dikes might have been rocks similar in composition to the autochthonous/parautochthonous gneissgranites of the Erzin metamorphic complex.
Ключевые слова:	BASALTS; THERMOCHRONOLOGY; MANTLE; TRACE-ELEMENT; MINGLING DYKES; ELEMENT RATIOS; SOUTHEASTERN TUVA; GRANITOID MAGMATISM; SOUTH-EAST TUVA; Western Sangilen; magma sources; U-Pb isotopic age; zircons; mingling; composite dikes; SYSTEM;
Издано:	2019
Физ. характеристика:	с.45-66