Russian Journal of Pacific Geology

, Volume 4, Issue 1, pp 1–12 | Cite as

Isotopic and geochemical characteristics of Upper Cretaceous and Cenozoic flysch sediments of the Kamchatka Peninsula and southern Koryak region

  • D. V. Kovalenko
  • O. O. Stavrova
  • N. V. Tsukanov
Article
  • 39 Downloads

Abstract

The isotopic and geochemical studies of the Upper Cretaceous-Cenozoic flysch sequences of the Kamchatka Peninsula and southern Koryak region revealed that they were formed at least from two sources: one depleted (T) with low 87Sr/86Sr and high positive SrNd(T) values and one enriched (T) with high 87Sr/86Sr and negative SrNd(T) values. The enriched source was likely represented by complexes of ancient upper continental crust. The subduction-related rocks and, to a lesser extent, basalts of mid-oceanic ridges or back-arc basins could serve as a juvenile source for most of the flysch sediments. The Upper Cretaceous flysch sediments differ from their Cenozoic analogues in composition. The Upper Cretaceous rocks are dominated by enriched upper crustal material. The Cenozoic sequences of the Ukelayat Trough and Paleocene-Eocene sequences of the Kumroch Range contain a substantial amount of island-arc volcanoclastic material; the Eocene flysch of Karaginskii Island is compositionally similar to the Upper Cretaceous flysch sequences.

Key words

isotopic composition ancient continental crust depleted source quartz-feldspathic flysch Kamchatka Peninsula southern Koryak region 

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Copyright information

© Pleiades Publishing, Ltd. 2010

Authors and Affiliations

  • D. V. Kovalenko
    • 1
  • O. O. Stavrova
    • 1
  • N. V. Tsukanov
    • 2
  1. 1.Institute of Geology of Ore Deposits, Petrography, Mineralogy, and GeochemistryRussian Academy of SciencesMoscowRussia
  2. 2.Shirshov Institute of OceanologyRussian Academy of SciencesMoscowRussia

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