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Melting of eclogite facies sedimentary rocks in the Belomorian Eclogite Province, Russia.

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Title: Melting of eclogite facies sedimentary rocks in the Belomorian Eclogite Province, Russia.
Authors: Dokukina, K. A.1 ksdokukina@gmail.com, Mints, M. V.1, Konilov, A. N.1,2
Source: Journal of Metamorphic Geology. May2017, Vol. 35 Issue 4, p435-451. 17p. 3 Color Photographs, 3 Black and White Photographs, 4 Graphs, 1 Map.
Subjects: Eclogite, Sedimentary rocks, Subduction, Mesoarchaean, Sediments
Abstract: The eclogites exposed along northeastern boundary of the Belomorian orogen in the eastern Fennoscandian Shield were formed as a result of Mesoarchean–Neoarchean subduction and collision. As has been shown previously, the common protolith of the Salma-type subduction-related eclogite was oceanic layered gabbro. In this paper, we characterize eclogites formed from volcanic–sedimentary rocks of the upper oceanic crust, which comprised pillow lavas and associated aluminous sediments that filled the interpillow space intercalated with lava flows. As a result of eclogite facies metamorphism, the aluminous sediments have been transformed into coarse-grained garnet–phengite–quartz rocks under pressure no lower than 21 kbar at a temperature of ~650 °C. Alternatively, we cannot rule out the possibility that the garnet–phengite–quartz veins represent solidified felsic melts that were produced by melting of boron-bearing hydrothermally altered oceanic crust in the subduction zone. During transfer to the upper crust under high-P granulite facies conditions, phengite underwent incongruent melting with formation of complex polymineralic pseudomorphs consisting of feldspar, biotite, muscovite and kyanite with corundum and dumortierite. The peak of high-T metamorphism during exhumation of the eclogites is estimated at 850–900 °C, i.e. at least 50–100 °C higher than previous estimates. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Metamorphic Geology is the property of Wiley-Blackwell 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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DbLabel: Engineering Source
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  Data: Melting of eclogite facies sedimentary rocks in the Belomorian Eclogite Province, Russia.
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  Data: <searchLink fieldCode="AR" term="%22Dokukina%2C+K%2E+A%2E%22">Dokukina, K. A.</searchLink><relatesTo>1</relatesTo><i> ksdokukina@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Mints%2C+M%2E+V%2E%22">Mints, M. V.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Konilov%2C+A%2E+N%2E%22">Konilov, A. N.</searchLink><relatesTo>1,2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Metamorphic+Geology%22">Journal of Metamorphic Geology</searchLink>. May2017, Vol. 35 Issue 4, p435-451. 17p. 3 Color Photographs, 3 Black and White Photographs, 4 Graphs, 1 Map.
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  Data: <searchLink fieldCode="DE" term="%22Eclogite%22">Eclogite</searchLink><br /><searchLink fieldCode="DE" term="%22Sedimentary+rocks%22">Sedimentary rocks</searchLink><br /><searchLink fieldCode="DE" term="%22Subduction%22">Subduction</searchLink><br /><searchLink fieldCode="DE" term="%22Mesoarchaean%22">Mesoarchaean</searchLink><br /><searchLink fieldCode="DE" term="%22Sediments%22">Sediments</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The eclogites exposed along northeastern boundary of the Belomorian orogen in the eastern Fennoscandian Shield were formed as a result of Mesoarchean–Neoarchean subduction and collision. As has been shown previously, the common protolith of the Salma-type subduction-related eclogite was oceanic layered gabbro. In this paper, we characterize eclogites formed from volcanic–sedimentary rocks of the upper oceanic crust, which comprised pillow lavas and associated aluminous sediments that filled the interpillow space intercalated with lava flows. As a result of eclogite facies metamorphism, the aluminous sediments have been transformed into coarse-grained garnet–phengite–quartz rocks under pressure no lower than 21 kbar at a temperature of ~650 °C. Alternatively, we cannot rule out the possibility that the garnet–phengite–quartz veins represent solidified felsic melts that were produced by melting of boron-bearing hydrothermally altered oceanic crust in the subduction zone. During transfer to the upper crust under high-P granulite facies conditions, phengite underwent incongruent melting with formation of complex polymineralic pseudomorphs consisting of feldspar, biotite, muscovite and kyanite with corundum and dumortierite. The peak of high-T metamorphism during exhumation of the eclogites is estimated at 850–900 °C, i.e. at least 50–100 °C higher than previous estimates. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Metamorphic Geology is the property of Wiley-Blackwell 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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        Value: 10.1111/jmg.12239
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        Text: English
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        PageCount: 17
        StartPage: 435
    Subjects:
      – SubjectFull: Eclogite
        Type: general
      – SubjectFull: Sedimentary rocks
        Type: general
      – SubjectFull: Subduction
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      – SubjectFull: Mesoarchaean
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      – SubjectFull: Sediments
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    Titles:
      – TitleFull: Melting of eclogite facies sedimentary rocks in the Belomorian Eclogite Province, Russia.
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            NameFull: Dokukina, K. A.
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              Text: May2017
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              Y: 2017
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