Geodynamic settings of the formation of amphibolites of the Kichera zone of the Baikal-Muya foldbelt: Results of geochemical studies

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• 作者：A. A. Andreev (1)
  E. Yu. Rytsk (2)
  S. D. Velikoslavinskii (2)
  A. B. Kotov (2)
  V. V. Yarmolyuk (1)
  V. P. Kovach (2)
  E. V. Tolmacheva (2)
  
  1. Institute of Geology of Ore Deposits ; Petrography ; Mineralogy ; and Geochemistry ; Russian Academy of Sciences ; Staromonetnyi per. 35 ; Moscow ; 119017 ; Russia
  2. Institute of Precambrian Geology and Geochronology ; Russian Academy of Sciences ; nab. Makarova 2 ; St. Petersburg ; 199034 ; Russia
  
• 刊名：Doklady Earth Sciences
• 出版年：2015
• 出版时间：February 2015
• 年：2015
• 卷：460
• 期：2
• 页码：168-173
• 全文大小：341 KB
• 参考文献：1. E. Yu. Rytsk, V. P. Kovach, V. V. Yarmolyuk, and V. I. Kovalenko, Geotectonics 46(6) 440鈥?64.
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• 刊物主题：Earth Sciences, general;
• 出版者：Springer US
• ISSN：1531-8354

文摘

It was established that amphibolites of the Kichera zone of the Baikal-Muya belt (BMB) belong, at least, to two age groups: (I) Early Neoproterozoic large metamafic xenoliths entrapped by granitic rocks of 750 Ma and (II) Late Neoproterozoic (650-620 Ma) amphibolites, which compose individual tectonic sheets and lenses. The rocks of these groups are distinct in chemical composition: the low-Ti amphibolites of the first group with increased Al2O3 contents are similar to modern IABs, whereas the highly-Ti amphibolites of the second group correspond to MORBs and OIBs. The geochemical data showed that the igneous protoliths of amphibolites of the Kichera zone were formed during different stages of the BMB evolution distinct in geodynamic settings.