Magnetostratigraphy of the Campanian-Maastrichtian Bakchar Basin (southeastern West Siberia)

Z. N. Gnibidenko, N. K. Lebedeva, A. V. Levicheva

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

In this paper the results of magnetostratigraphic studies of the Upper Cretaceous penetrated by two wells (S-124 and S-114) drilled in the Tomsk structural-facies zone (Bakchar iron ore deposit) are presented. The obtained biostratigraphic data show that the sediments formed in the Campanian-Maastrichtian time interval. The high-temperature component of the remanent magnetization identified in the rocks allowed us to compile paleomagnetic columns for each well and correlate the columns, using paleontological data, with each other and with the general magnetostratigraphic and magnetochronological scales. In magnetostratigraphic sections of two wells, the Campanian reverse-polarity Slavgorod Formation (R(km)) with a normal-polarity horizon is correlated with Chron C33(r) (top) and C33(n) (bottom) of the Gradstein scale, and the Maastrichtian normal-polarity Gan'kino Formation with a thin reverse-polarity horizon (N(mt)) is correlated with Chron C30 of this scale.

Original languageEnglish
Pages (from-to)1652-1661
Number of pages10
JournalRussian Geology and Geophysics
Volume56
Issue number11
DOIs
Publication statusPublished - Nov 2015

Keywords

  • Bakchar iron ore deposit
  • Campanian
  • Dinocysts
  • Maastrichtian
  • Paleomagnetic section
  • Palynoassemblages
  • Southeastern West Siberia
  • Upper Cretaceous

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