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. |
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| 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] |
| Database: | Energy & Power Source |
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| 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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| ISSN: | 18197140 |
| DOI: | 10.1134/S1819714021010073 |
