Инд. авторы:	Likhanov I.I., Reverdatto V.V., Kozlov P.S., Khiller V.V.
Заглавие:	Neoproterozoic metamorphic evolution in the Transangarian Yenisei Ridge: Evidence from monazite and xenotime geochronology
Библ. ссылка:	Likhanov I.I., Reverdatto V.V., Kozlov P.S., Khiller V.V. Neoproterozoic metamorphic evolution in the Transangarian Yenisei Ridge: Evidence from monazite and xenotime geochronology // Doklady Earth Sciences. - 2013. - Vol.450. - Iss. 1. - P.556-561. - ISSN 1028-334X. - EISSN 1531-8354.
Внешние системы:	DOI: 10.1134/S1028334X1305019X; SCOPUS: 2-s2.0-84878916750; WoS: 000320276900018;
Реферат:	eng: Chemical mapping and in situ dating of U-Th-rich minerals in zoned garnets from gneisses of the Garevka metamorphic complex were used to constrain multiple metamorphic events in the Transangarian Yenisei Ridge. The data provide supporting evidence for three distinct metamorphic stages. The first episode occurred as a result of the Grenville orogeny during the Late Mesozoic and Early Neoproterozoic (1050-850 Ma) and was marked by low-pressure zoned metamorphism and a metamorphic field gradient with dT/dH = 20-30 °C/km typical of orogenic belts. At the second stage, the rocks experienced Late Riphean (801-793 Ma) syn-collisional medium-pressure metamorphism with a low metamorphic field gradient (dT/dH ≤ 10 °C/km). The final stage evolved as a synexhumation dynamic metamorphism (785-776 Ma) with dT/dH ≤ 12 °C/km and reflected rapid exhumation of rocks in shear zones. The sequence of collisional events within the western margin of the Siberian craton affected by the Valhalla orogen suggests that Siberia and cratons of the North Atlantic region were in close proximity to one another at about 800 Ma, which is supported by recent paleomagnetic reconstructions. © 2013 Pleiades Publishing, Ltd.
Ключевые слова:	Siberian Craton; Russian Federation; Krasnoyarsk [Russian Federation]; xenotime; shear zone; Proterozoic; orogenic belt; monazite; metamorphism; Grenvillian orogeny; geochronology; exhumation; craton; Yenisei Ridge; Metamorphic rocks; Uranium; Thorium; Phosphate minerals; Geochronology; Orogenic belts; North Atlantic; Metamorphic stages; Metamorphic evolution; Metamorphic events; Field gradient; Close proximity; Chemical mapping; collision zone;
Издано:	2013
Физ. характеристика:	с.556-561