Paleoproterozoic anorogenic granitoids of the Zheltav sialic massif (Southern Kazakhstan): Structural position and geochronology

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• 作者：A. A. Tretyakov ; K. E. Degtyarev ; E. B. Sal'nikova…
• 刊名：Doklady Earth Sciences
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：466
• 期：1
• 页码：14-19
• 全文大小：1,284 KB
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• 作者单位：A. A. Tretyakov (1)
  K. E. Degtyarev (1)
  E. B. Sal’nikova (2)
  K. N. Shatagin (3)
  A. B. Kotov (2)
  A. V. Ryazantsev (1)
  A. V. Pilitsyna (1)
  S. Z. Yakovleva (2)
  E. V. Tolmacheva (2)
  Yu. V. Plotkina (2)
  
  1. Geological Institute (GIN RAS), Russian Academy of Sciences, Pyzhevsky per. 7, Moscow, 119017, Russia
  2. Institute of Precambrian Geology and Geochronology (IPGG RAS), Russian Academy of Sciences, Makarova nab. 2, St. Petersburg, 199034, Russia
  3. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM RAS), Russian Academy of Sciences, Staromonetny per. 35, Moscow, 119017, Russia
  
• 刊物主题：Earth Sciences, general;
• 出版者：Springer US
• ISSN：1531-8354

文摘

The basement of the Zheltav sialic massif (Southern Kazakhstan) is composed of different metamorphic rocks united into the Anrakhai Complex. In the southeastern part of the massif, these rocks form a large antiform with the core represented by amphibole and clinopyroxene gneissic granite varieties. By their chemical composition, dominant amphibole (hastingsite) gneissic granites correspond to subalkaline granites, while their petroand geochemical properties make them close to A-type granites. The U–Pb geochronological study of accessory zircons yielded an age of 1841 ± 6 Ma, which corresponds to the crystallization age of melts parental for protoliths of amphibole gneissic granites of the Zheltav Massif. Thus, the structural–geological and geochronological data make it possible to define the Paleoproterozoic (Staterian) stage of anorogenic magmatism in the Precambrian history of the Zheltav Massif. The combined Sm–Nd isotopic—geochronological data and age estimates obtained for detrital zircons indicate the significant role of the Paleoproterozoic tectono-magmatic stage in the formation of the Precambrian continental crust of sialic massifs in Kazakhstan and northern Tien Shan.