1887
  1. Home
  2. Conferences
  3. Conference Proceedings
  4. EAGE/SPE Workshop on Shale Science 2021
  5. Conference paper

Abstract

Summary

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.

© EAGE Publications BV
Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.202151032
2021-04-05
2024-04-27

  • From This Site

    /content/papers/10.3997/2214-4609.202151032
    dcterms_title,dcterms_subject,pub_keyword
    -contentType:Journal -contentType:Contributor -contentType:Concept -contentType:Institution
    10
    5
Loading full text...

Full text loading...

References

  1. 1.WilkinR.T., BarnesH.L. and BrantleyS.L. [1996] The size distribution of framboidal pyrite in modern sediments: An indicator of redox conditions.Geochimica et Cosmochimica Acta, 60 (20), 3897–3912.
     [Google Scholar]
  2. 2.Berner, R. A. [1982]. Burial of organic carbon and pyrite sulfur in modern ocean: its geochemical and environmental significance.American Journal of Science282, 451–473.
     [Google Scholar]
  3. 3.Berner, R. A. and Raiswell, R. [1983] Burial of organic carbon and pyrite sulfur in sediments over geologic time.Geochimica et Cosmochimica Acta, 47 (5), 855–862.
     [Google Scholar]
  4. 4.RaiswellR. and CanfieldD.E. [1998] Sources of iron for pyrite formation in marine sediments.American Journal of Science, 298, 219–245.
     [Google Scholar]
  5. 5.WignallP. B. and NewtonR. [1998] Pyrite framboid diameter as a measure of oxygen deficiency in ancient mudrocks.American Journal of Science September, 298 (7), 537–552.
     [Google Scholar]
  6. 6.StraussH. [1997] The isotopic composition of sedimentary sulfur through time.Palaeogeography, Palaeoclimatology, Palaeoecology, 132, 97–118.
     [Google Scholar]
  7. 7.SimM., BosakT and OnoS. [2011] Large sulfur isotope fractionation does not require disproportionation.Science, 333 (6038), 74–77.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.202151032
Loading
Pyrite Morphology and Sulfur Isotope Composition in The Bazhenov Formation of West Siberia
Conference Proceedings 2021, 1 (2021); https://doi.org/10.3997/2214-4609.202151032
/content/papers/10.3997/2214-4609.202151032
/content/papers/10.3997/2214-4609.202151032
Loading

Data & Media loading...

Most Cited This Month Most Cited RSS feed

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error