Lateral zoning of groundwater chemistry and authigenic mineralogy in the Oxfordian regional reservoir of the Nadym–Taz interfluve

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Abstract

This is a pioneering study on lateral zoning of groundwater chemistry and authigenic mineralogy in the Oxfordian regional reservoir of the Nadym–Taz interfluve. According to thermodynamic calculations, the nonequilibrium–equilibrium water–rock system lacks equilibrium with primary magmatic minerals, such as albite, anorthite, and microcline, though the water is moderately saline (up to 63.3 g/L) and has been in interaction with rocks for ~165 million years. Authigenic minerals form continuously and successively (kaolinite–montmorillonite–illite–micas–chlorite–albite–microcline) from waters that have certain рH and contents of SiO2, Al, Na, K, Ca, and Mg. The equilibrium of groundwater with primary aluminosilicate minerals impinges on a carbonate barrier, and almost all rocks are more or less strongly carbonatized. Authigenic mineral assemblages from the southern Nadym–Taz interfluve include kaolinite unlike those from the northern part of the region, where albitization is more common. Authigenesis generally decays in the eastern direction.

Original languageEnglish
Pages (from-to)662-674
Number of pages13
JournalRussian Geology and Geophysics
Volume60
Issue number6
DOIs
Publication statusPublished - Jun 2019

Keywords

  • Arctic
  • Authigenic minerals
  • Catagenesis
  • Groundwater chemistry
  • Lateral zoning
  • Upper Jurassic
  • Water–mineral complex
  • Water–rock system
  • West Siberia

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