Late Riphean age of the crystalline basement of the carbonate cover of the Dzabkhan microcontinent

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• 作者：I. K. Kozakov ; T. I. Kirnozova ; V. P. Kovach…
• 关键词：stratigraphy ; Late Precambrian ; U ; Pb geochronology ; zircon ; granitoides ; Central Asian Orogenic Belt
• 刊名：Stratigraphy and Geological Correlation
• 出版年：2015
• 出版时间：May 2015
• 年：2015
• 卷：23
• 期：3
• 页码：237-245
• 全文大小：1,613 KB
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• 作者单位：I. K. Kozakov (1)
  T. I. Kirnozova (2)
  V. P. Kovach (1)
  L. B. Terent’eva (1)
  E. V. Tolmacheva (1)
  M. M. Fugzan (2)
  Ch. Erdenezhargal (3)
  
  1. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, St. Petersburg, Russia
  2. Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, Moscow, Russia
  3. Institute of Geology and Mineral Resources, Academy of Sciences of Mongolia, Ulaanbaatar, Mongolia
  
• 刊物主题：Historical Geology; Structural Geology; Geophysics/Geodesy; Sedimentology; Archaeology;
• 出版者：Springer US
• ISSN：1555-6263

文摘

The Dzabkhan microcontinent was earlier considered as a fragment of an ancient craton in the structure of the Central Asian Orogenic Belt. Deposits of the Tsagaan Oloom Formation were included in the shelf zone, under the assumption that they were related to the regional unconformity between the Early-Late Precambrian crystal formations. The carbonate sequence of the Tsagaan Oloom Formation overlaps crystalline rocks only in the eastern part of the Dzabkhan microcontinent, where dolomites lie unconformably on high-grade metamorphic rocks intruded by granitoids of the Bogdyngol massif. The latter were included in the composition of both the Early Precambrian basement and the Middle Riphean intrusive complex. We have determined the U-Pb zircon age of these granitoids at 717 ± 5 Ma and the Nd model ages of granitoids and gneisses of the basement of the Tsagaan Oloom Formation at 2.0-.9 Ga at ε_Nd = ?0.0...?.6. Recent geochronological and Nd and Pb-Pb isotopic and geochemical data indicate that intrusive and high-grade metamorphic complexes are absent in the crystalline basement of the Dzabkhan microcontinent, similar to those in ancient cratons. One can assume that the Late Riphean carbonate cover (Tsagaan Oloom Formation) deposited on the Late Precambrian continental block.