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The First Evidence for Late Devonian Granitoid Magmatism in the Northeastern Flank of the South Mongolia–Khingan Orogenic Belt.

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Title: The First Evidence for Late Devonian Granitoid Magmatism in the Northeastern Flank of the South Mongolia–Khingan Orogenic Belt.
Authors: Smirnov, Y. V.1 (AUTHOR) smirnova@ascnet.ru, Sorokin, A. A.1 (AUTHOR), Kudryashov, N. M.2 (AUTHOR) nik@geoksc.apatity.ru
Source: Russian Journal of Pacific Geology. Jan2021, Vol. 15 Issue 1, p39-50. 12p.
Subject Terms: *Orogenic belts, *Magmatism, *Continental margins, *Granite, *Evidence, *Neodymium isotopes
Abstract: This paper reports the geochemical, U–Pb geochronological, and Sm-Nd isotopic–geochemical data on granites of the Medvedka Massif in the northern part of the Nora–Sukhotino terrane. It has been found that these granites have an age of 378 ± 3 Ma. They contain ferruginous silicates, have high iron index (FeO*/(FeO*+MgO)), low concentrations of Al2O3, CaO, MgO, high contents of Nb, Ga, Y, a deficiency of Sr and Eu, positive values of εNd(t) (+3.0...+4.1), and a high Y/Nb ratio. All these data indicate that the granites of the Medvedka massif are A2-type granites. The Late Devonian hastingsite–biotite granites of the Medvedka massif most likely reflect a transform continental margin setting in the evolution of the South Mongolian–Khingan orogenic belt. [ABSTRACT FROM AUTHOR]
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  Data: The First Evidence for Late Devonian Granitoid Magmatism in the Northeastern Flank of the South Mongolia–Khingan Orogenic Belt.
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  Data: <searchLink fieldCode="AR" term="%22Smirnov%2C+Y%2E+V%2E%22">Smirnov, Y. V.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> smirnova@ascnet.ru</i><br /><searchLink fieldCode="AR" term="%22Sorokin%2C+A%2E+A%2E%22">Sorokin, A. A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kudryashov%2C+N%2E+M%2E%22">Kudryashov, N. M.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> nik@geoksc.apatity.ru</i>
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  Data: <searchLink fieldCode="JN" term="%22Russian+Journal+of+Pacific+Geology%22">Russian Journal of Pacific Geology</searchLink>. Jan2021, Vol. 15 Issue 1, p39-50. 12p.
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  Data: *<searchLink fieldCode="DE" term="%22Orogenic+belts%22">Orogenic belts</searchLink><br />*<searchLink fieldCode="DE" term="%22Magmatism%22">Magmatism</searchLink><br />*<searchLink fieldCode="DE" term="%22Continental+margins%22">Continental margins</searchLink><br />*<searchLink fieldCode="DE" term="%22Granite%22">Granite</searchLink><br />*<searchLink fieldCode="DE" term="%22Evidence%22">Evidence</searchLink><br />*<searchLink fieldCode="DE" term="%22Neodymium+isotopes%22">Neodymium isotopes</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: This paper reports the geochemical, U–Pb geochronological, and Sm-Nd isotopic–geochemical data on granites of the Medvedka Massif in the northern part of the Nora–Sukhotino terrane. It has been found that these granites have an age of 378 ± 3 Ma. They contain ferruginous silicates, have high iron index (FeO*/(FeO*+MgO)), low concentrations of Al2O3, CaO, MgO, high contents of Nb, Ga, Y, a deficiency of Sr and Eu, positive values of εNd(t) (+3.0...+4.1), and a high Y/Nb ratio. All these data indicate that the granites of the Medvedka massif are A2-type granites. The Late Devonian hastingsite–biotite granites of the Medvedka massif most likely reflect a transform continental margin setting in the evolution of the South Mongolian–Khingan orogenic belt. [ABSTRACT FROM AUTHOR]
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1134/S1819714021010073
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      – Code: eng
        Text: English
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        PageCount: 12
        StartPage: 39
    Subjects:
      – SubjectFull: Orogenic belts
        Type: general
      – SubjectFull: Magmatism
        Type: general
      – SubjectFull: Continental margins
        Type: general
      – SubjectFull: Granite
        Type: general
      – SubjectFull: Evidence
        Type: general
      – SubjectFull: Neodymium isotopes
        Type: general
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      – TitleFull: The First Evidence for Late Devonian Granitoid Magmatism in the Northeastern Flank of the South Mongolia–Khingan Orogenic Belt.
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            NameFull: Sorokin, A. A.
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            NameFull: Kudryashov, N. M.
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            – D: 01
              M: 01
              Text: Jan2021
              Type: published
              Y: 2021
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              Value: 18197140
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            – TitleFull: Russian Journal of Pacific Geology
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