The chemical composition and strontium isotopes of brines from the Tunguska basin

Implications for their formation

S. L. Shvartsev

    Research output: Contribution to journalArticle

    7 Citations (Scopus)

    Abstract

    The results of the examination of the chemical composition and Sr isotopic ratios in brines of Cl-Ca, Cl-Ca-Na, and Cl-Na types from the Tunguska basin with the total salinity within the range of 87-626 g/1 are discussed. The pH is 2.9 to 7.7, and the Sr isotope ratios are 0.70825 ± 5 to 0.72010 ± 11. It is shown that the examined brines strongly differ drastically in their composition from the marine brine formed at the stage of halite precipitation. Based on their composition in terms of a number of indicative indices, we differentiated the brines into infiltrational and sedimentational, with a wide range of mixing between sedimentational and infiltrational (fresh and saline) waters. The sedimentational brines are strongly altered, which is evident from their higher Ca, Sr, Br, and radiogenic 87Sr contents. Sr isotope composition shows that all the brines interact at a various extent with aluminosilicate minerals of the terrigenous or basement rocks, which has led to an enrichment of brines in radiogenic Sr by 2-100%. Two groups of brines have been discriminated by type of strontium alteration: (1) brines altered in sulfate-carbonate rocks with a low 87Sr content and (2) brines altered in aluminosilicate rocks with a high 87Sr content.

    Original languageEnglish
    Pages (from-to)1070-1083
    Number of pages14
    JournalGeochemistry International
    Volume38
    Issue number11
    Publication statusPublished - Nov 2000

    Fingerprint

    Strontium Isotopes
    strontium isotopes
    brines
    Brines
    strontium isotope
    aluminosilicate
    chemical composition
    isotopes
    isotope
    halite
    basement rock
    strontium
    Chemical analysis
    isotopic ratio
    basin
    carbonate rock
    brine
    sulfate
    salinity
    mineral

    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geophysics

    Cite this

    The chemical composition and strontium isotopes of brines from the Tunguska basin : Implications for their formation. / Shvartsev, S. L.

    In: Geochemistry International, Vol. 38, No. 11, 11.2000, p. 1070-1083.

    Research output: Contribution to journalArticle

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