TY - JOUR

T1 - Orthopyroxene-sillimanite granulites of the Angara-Kan block (SW Siberian craton)

T2 - Constraints on timing of UHT metamorphism

AU - Sukhorukov, Vasiliy

AU - Turkina, Olga

AU - Tessalina, Svetlana

AU - Talavera, Cristina

N1 - Funding Information: We thank Dr. Alexander Nozhkin of the Institute of geology and mineralogy, Novosibirsk for providing samples. The authors wish to thank Brad McDonald (Curtin University) for technical assistance regarding sample preparation and analysis. GeoHistory Facility instruments were funded via an Australian Geophysical Observing System grant provided to AuScope Pty Ltd. by the AQ44 Australian Education Investment Fund program. Zircon analyses were carried out on the SHRIMP II with the financial support of the Australian Research Council and Auscope NCRIS. Funding Information: The work is done on the state assignment of IGM SB RAS with the financial support of the Ministry of Science and Higher Education of the Russian Federation. Publisher Copyright: © 2020 Elsevier Ltd Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2021/3

Y1 - 2021/3

N2 - We report here the evidence of protracted metamorphic evolution of orthopyroxene-sillimanite granulite culminating in UHT metamorphism within the Paleoproterozoic granulite complex of the Angara-Kan block (SW Siberian craton). The Opx-Sil granulites were formed during UHT metamorphism (T = 1070–1100 °C and P = 9 kbar) at ca. 1.8 Ga which was followed by retrograde isobaric cooling down to the temperature around 900–950 °C. At ca. 1.74 Ga Opx-Sil granulites were trapped and partly reworked by a granitic melt with crystallization of perthitic feldspar at about 750 °C. The integration of all data on metamorphism and granitoid magmatism of the Angara-Kan block indicates two-staged metamorphic history. The first stage of the granulite facies metamorphism occurred in the time range of 1.89–1.85 Ga and was terminated by the emplacement of the 1.84 Ga post-collisional granites, the second stage of metamorphism occurred at UHT conditions and culminated in 1.78–1.8 Ga. The UHT metamorphism including the isobaric cooling retrograde stage and granite magmatism had a duration of 30 to 60 million years from 1.78–1.8 to 1.74–1.75 Ga.

AB - We report here the evidence of protracted metamorphic evolution of orthopyroxene-sillimanite granulite culminating in UHT metamorphism within the Paleoproterozoic granulite complex of the Angara-Kan block (SW Siberian craton). The Opx-Sil granulites were formed during UHT metamorphism (T = 1070–1100 °C and P = 9 kbar) at ca. 1.8 Ga which was followed by retrograde isobaric cooling down to the temperature around 900–950 °C. At ca. 1.74 Ga Opx-Sil granulites were trapped and partly reworked by a granitic melt with crystallization of perthitic feldspar at about 750 °C. The integration of all data on metamorphism and granitoid magmatism of the Angara-Kan block indicates two-staged metamorphic history. The first stage of the granulite facies metamorphism occurred in the time range of 1.89–1.85 Ga and was terminated by the emplacement of the 1.84 Ga post-collisional granites, the second stage of metamorphism occurred at UHT conditions and culminated in 1.78–1.8 Ga. The UHT metamorphism including the isobaric cooling retrograde stage and granite magmatism had a duration of 30 to 60 million years from 1.78–1.8 to 1.74–1.75 Ga.

KW - Angara orogenic belt

KW - Angara-Kan block

KW - Granulite

KW - Paleoprotherozoic

KW - Siberian craton

KW - UHT metamorphism

UR - http://www.scopus.com/inward/record.url?scp=85098938951&partnerID=8YFLogxK

U2 - 10.1016/j.jseaes.2020.104650

DO - 10.1016/j.jseaes.2020.104650

M3 - Article

AN - SCOPUS:85098938951

VL - 207

JO - Journal of Asian Earth Sciences

JF - Journal of Asian Earth Sciences

SN - 1367-9120

M1 - 104650

ER -