Archean Metamorphism of Al-Rich Gneisses of the Larba Block in the Ilikan Zone of the Dzhugdzhur–Stanovoy Superterrane.
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| Title: | Archean Metamorphism of Al-Rich Gneisses of the Larba Block in the Ilikan Zone of the Dzhugdzhur–Stanovoy Superterrane. |
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| Authors: | Yurchenko, A. V.1 (AUTHOR) yurchenko-nastya@yandex.ru, Rizvanova, N. G.1 (AUTHOR), Galankina, O. L.1 (AUTHOR), Baltybaev, Sh. K.1,2 (AUTHOR) |
| Source: | Doklady Earth Sciences. Jun2026, Vol. 528 Issue 2, p1-6. 6p. |
| Subjects: | Metamorphism (Geology), Metamorphic rocks, Radioactive dating |
| Abstract: | The supracrustal strata of the Larba block of the Dzhugdzhur–Stanovoy superterrane are dominated by crystalline schists and garnet-biotite-cordierite ± sillimanite gneisses, which are intruded by charnockites and enderbites. The studied metasedimentary aluminous gneisses underwent moderate-pressure granulite-facies metamorphism (7–8 kbar, 800–850°C) and regressive transformations under transitional conditions from the granulite to amphibolite facies (4–5 kbar, 620–730°C), with a subsequent decrease in parameters to the conditions of the chlorite-muscovite subfacies of the greenschist facies metamorphism. Chemical (Th–U–Pb) and isotope-geochemical (U–Pb ID-TIMS) analysis of monazite grains showed that the gneisses were metamorphosed in the Archean and Proterozoic. They underwent Archean granulite-facies metamorphism 2.65 Ga ago, and Proterozoic transformations of the granulites became intense ~1.8 Ga ago. The first direct dating of metasedimentary rocks reveals the earliest Archean metamorphic events, which is important for establishing the upper age limit for the accumulation of sedimentary strata in the Larba block. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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