Pyrite morphology and sulfur isotope composition in the bazhenov formation of west siberia

E. Idrisova, T. Karamov, A. Voropaev, R. Gabitov, N. Bogdanovich, M. Spasennykh

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Pyrite morphology and sulfur isotope composition may serve as indicators of redox conditions changes during sedimentation process. Redox conditions, in turn, affect the accumulation and transformation of organic matter in the rocks. Pyrite morphology was studied with scanning electron microscopy (SEM). Sulfur isotope composition was measured with two methods: Isotope ratio mass spectrometry (IRMS) and secondary isotope ratio mass spectrometry (SIMS). The studied rock samples of the Bazhenov Formation contain various pyrite types: Small (5-10 μm) and large (10-30 μm ) framboids, fine-crystalline (1-2 μm) aggregates and large euhedral crystals (20-50 μm). Small framboids and fine-crystalline pyrite have isotopically light sulfur, δ34S varies in the range from-55 to-20 ‰ CDT. Large framboids and large idiomorphic crystals contain more isotopically heavy sulfur (up to 25 ‰ CDT). The abundance of small framboids indicates anoxic or euxinic sedimentation conditions that control OM's accumulation and preservation. Large framboids and large pyrite crystals in the sediments indicate the suboxic conditions of sedimentation and possible oxidation of OM during early diagenesis.

    Original languageEnglish
    Title of host publicationEAGE/SPE Workshop on Shale Science 2021
    Subtitle of host publicationNew Challenges
    PublisherEuropean Association of Geoscientists and Engineers, EAGE
    ISBN (Electronic)9789462823716
    Publication statusPublished - 2021
    EventEAGE/SPE Workshop on Shale Science 2021: New Challenges - Moscow, Russian Federation
    Duration: 5 Apr 20216 Apr 2021

    Publication series

    NameEAGE/SPE Workshop on Shale Science 2021: New Challenges

    Conference

    ConferenceEAGE/SPE Workshop on Shale Science 2021: New Challenges
    Country/TerritoryRussian Federation
    CityMoscow
    Period5/04/216/04/21

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