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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.
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]
Copyright of Doklady Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Archean Metamorphism of Al-Rich Gneisses of the Larba Block in the Ilikan Zone of the Dzhugdzhur–Stanovoy Superterrane.
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  Data: 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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  Data: <i>Copyright of Doklady Earth Sciences is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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