Инд. авторы:	Likhanov I.I., Nozhkin A.D., Reverdatto V.V., Krylov A.A., Kozlov P.S., Khiller V.V.
Заглавие:	Metamorphic evolution of ultrahigh-temperature fe- and al-rich granulites in the south yenisei ridge and tectonic implications
Библ. ссылка:	Likhanov I.I., Nozhkin A.D., Reverdatto V.V., Krylov A.A., Kozlov P.S., Khiller V.V. Metamorphic evolution of ultrahigh-temperature fe- and al-rich granulites in the south yenisei ridge and tectonic implications // Petrology. - 2016. - Vol.24. - Iss. 4. - P.392-408. - ISSN 0869-5911. - EISSN 1556-2085.
Внешние системы:	DOI: 10.1134/S086959111603005X; РИНЦ: 27035512; SCOPUS: 2-s2.0-84978399497; WoS: 000379865600004;
Реферат:	eng: This study provides the first evidence for the occurrence of ultrahigh-temperature (UHT) granulite-facies metamorphism in the Yenisei Ridge (Angara–Kan block). UHT metamorphism is documented in Fe-Al-rich metapelites on the basis of the garnet–hypersthene–sillimanite–cordierite–plagioclase–biotite–spinel–quartz–K-feldspar assemblage. Microtextural relationships and compositional data for paragneisses of the Kan complex attest to three distinct metamorphic episodes: (M1) pre-peak prograde (820⎯900°C/5.5–7 kbar), (M2) peak UHT (920–1000°C/7–9 kbar), and (M3) post-peak retrograde (770⎯900°C/5.5–7.5 kbar). The observed counterclockwise P–T evolution at a high geothermal gradient (dT/dP = 100–200°C/kbar) suggests that UHT metamorphic assemblages were formed in an overall extensional tectonic setting accompanied by underplating of mantle-derived mafic magmas, which may be sourced from ~1750 Ma giant radiating dike swarms linked to the Vilyuy mantle plume as part of the Trans-Siberian LIP. The broad synchroneity of UHT metamorphism (1744 ± 26 Ma; monazite–zircon isochron age) and rift-related endogenic activity in the region can provide an additional line of evidence for the two-stage evolution of granulite-facies metamorphism in the Angara–Kan block. The Aldan–Stanovoy, Anabar, and Baikal basement inliers of high-grade metamorphic rocks within the Siberian craton record two Paleoproterozoic peaks (1.9 and 1.75 Ga) of granulite-facies metamorphism. The synchronous sequence of tectonothermal events at the periphery of the large Precambrian Laurentian, Baltica, and Siberian cratons provide convincing evidence for their spatial proximity over a wide time interval, which is consistent with the most recent paleomagnetic reconstructions of the Proterozoic supercontinent Nuna.
Издано:	2016
Физ. характеристика:	с.392-408
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