TY - JOUR

T1 - Early Palaeoproterozoic granulite-facies metamorphism and partial melting of eclogite-facies rocks in the Salma association, eastern Fennoscandian Shield, Russia

AU - Dokukina, Ksenia

AU - Mints, M. V.

AU - Khubanov, V. B.

AU - Sheshukov, V. S.

AU - Konilov, A. N.

AU - Bayanova, T. B.

AU - Kaulina, T. V.

AU - Golunova, M. A.

AU - Dokukin, P. A.

AU - Okina, O. I.

AU - Van, K. V.

AU - Yudin, D. S.

AU - Travin, A. V.

AU - Zaitsev, A. V.

AU - Kosorukov, V. L.

AU - Pozhilenko, V. I.

AU - Golovanova, T. I.

N1 - Funding Information: The study was being carried out following the plans of the scientific research of the Geological Institute of RAS (project no. 0120145918) and was supported by the Russian Foundation for Basic Research (project no. 20-05-00190). The U-Pb isotopic LA-ICP-MS study was partially performed in the Analytical Centre of Mineralogical, Geochemical and Isotope Studies” in the Geological Institute, SB RAS Ulan-Ude, Russia (government task project No AAAA-A16-116122110027-2). This paper has been supported by the RUDN University Strategic Academic Leadership Program. 40 Ar/ 39 Ar dating is done on state assignment of IGM SB RAS. Anonymous reviewers improved significantly the first, second and third versions of the manuscript. We thank reviewers for their constructive review and for assistance with the English that improved the presentation. Funding Information: The study was being carried out following the plans of the scientific research of the Geological Institute of RAS (project no. 0120145918) and was supported by the Russian Foundation for Basic Research (project no. 20-05-00190). The U-Pb isotopic LA-ICP-MS study was partially performed in the Analytical Centre of Mineralogical, Geochemical and Isotope Studies? in the Geological Institute, SB RAS Ulan-Ude, Russia (government task project No AAAA-A16-116122110027-2). This paper has been supported by the RUDN University Strategic Academic Leadership Program. 40Ar/39Ar dating is done on state assignment of IGM SB RAS. Anonymous reviewers improved significantly the first, second and third versions of the manuscript. We thank reviewers for their constructive review and for assistance with the English that improved the presentation. Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/8/1

Y1 - 2021/8/1

N2 - The Salma-type Archaean eclogites exposed along the northwestern boundary of the Belomorian Eclogite Province in the eastern Fennoscandian Shield formed as a result of the Mesoarchaean–Neoarchaean subduction and collision. The common protoliths of the Salma-type subduction-related eclogites were oceanic layered gabbro and volcanic-sedimentary assemblage. The eclogite-facies pillow lavas and associated alumina-siliceous sediments that fill interpillow space and intercalate with lava flows are the main objects of our work. The kyanite-garnet–phengite–quartz rocks formed after alumina-siliceous sediments contain fluid inclusions trapped in large relic quartz grains. The fluid inclusions yielded an isochore that corresponds to PT-conditions of a beginning of the Salma oceanic rock subduction from the seafloor level that generally confirms the sedimentary provenance of these rocks. The alumina-siliceous sediments underwent the eclogite-facies metamorphism at pressure no lower than 21 kbar and temperatures of 650–750 °C and transformed into kyanite-garnet–phengite–quartz rocks. During exhumation under granulite-facies conditions at temperatures up to 900 °C and pressure down to 9 kbar, eclogite facies metasediments underwent partial melting accompanied by disequilibrium breakdown of phengite + quartz association with formation complex polymineralic pseudomorphs consisting of feldspars, biotite, muscovite, kyanite, corundum, and dumortierite. U-Pb dating of Th-rich igneous zircon from melted metasedimentary and mafic rocks using the LA-ICP-MS and TIMS methods yielded the time of granulite facies event accompanied by partial melting processes at ~2.45 Ga. After this, zircon underwent fluid-induced alteration, causing partial dissolution followed by precipitation of new Th–poor zircon and zircon rims around ancient grains at ~1.9 Ga ago

AB - The Salma-type Archaean eclogites exposed along the northwestern boundary of the Belomorian Eclogite Province in the eastern Fennoscandian Shield formed as a result of the Mesoarchaean–Neoarchaean subduction and collision. The common protoliths of the Salma-type subduction-related eclogites were oceanic layered gabbro and volcanic-sedimentary assemblage. The eclogite-facies pillow lavas and associated alumina-siliceous sediments that fill interpillow space and intercalate with lava flows are the main objects of our work. The kyanite-garnet–phengite–quartz rocks formed after alumina-siliceous sediments contain fluid inclusions trapped in large relic quartz grains. The fluid inclusions yielded an isochore that corresponds to PT-conditions of a beginning of the Salma oceanic rock subduction from the seafloor level that generally confirms the sedimentary provenance of these rocks. The alumina-siliceous sediments underwent the eclogite-facies metamorphism at pressure no lower than 21 kbar and temperatures of 650–750 °C and transformed into kyanite-garnet–phengite–quartz rocks. During exhumation under granulite-facies conditions at temperatures up to 900 °C and pressure down to 9 kbar, eclogite facies metasediments underwent partial melting accompanied by disequilibrium breakdown of phengite + quartz association with formation complex polymineralic pseudomorphs consisting of feldspars, biotite, muscovite, kyanite, corundum, and dumortierite. U-Pb dating of Th-rich igneous zircon from melted metasedimentary and mafic rocks using the LA-ICP-MS and TIMS methods yielded the time of granulite facies event accompanied by partial melting processes at ~2.45 Ga. After this, zircon underwent fluid-induced alteration, causing partial dissolution followed by precipitation of new Th–poor zircon and zircon rims around ancient grains at ~1.9 Ga ago

KW - Eclogite

KW - Granulite

KW - Metasedimentary rocks

KW - Partial melting

KW - Pillow lava

KW - U-Pb dating

UR - http://www.scopus.com/inward/record.url?scp=85107062830&partnerID=8YFLogxK

U2 - 10.1016/j.precamres.2021.106260

DO - 10.1016/j.precamres.2021.106260

M3 - Article

AN - SCOPUS:85107062830

VL - 361

JO - Precambrian Research

JF - Precambrian Research

SN - 0301-9268

M1 - 106260

ER -