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Inter-layered clay stacks in Jurassic shales

Abstract

As the average shale contains 60% clay minerals1, an understanding of the physical and chemical characteristics of these minerals is central to the question of burial diagenetic reactions and hydrocarbon generation. Much existing evidence concerning burial diagenesis relies on X-ray diffraction (XRD) data, particularly of the clay-size (<2 µm) fraction of shales2. Here we use scanning electron microscopy (SEM) in the backscattered electron (BSE) mode, together with energy-dispersive X-ray microanalysis (EDXA), to show that Lower Jurassic shales from the North Sea Basin contain large numbers of clay mineral stacks up to 150 µm in size. By studying polished shale sections with BSE and EDXA, the size, shape orientation, textural relationships and internal compositional variations of the clays can be observed in situ. We present here preliminary evidence which suggests that the clay stacks studied are authigenic, and may have formed at shallow burial depths during early diagenesis.

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References

  1. Shaw, D. B. & Weaver, C. E. J. sedim. Petrol. 35, 213–222 (1965).

    CAS  Google Scholar 

  2. Hower, J., Eslinger, E. V., Hower, M. E. & Perry, E. A. Bull. geol. Soc. Am. 87, 725–737 (1976).

    Article  CAS  Google Scholar 

  3. Hall, M. G. & Lloyd, G. E. Am. Miner. 66, 362–368 (1981).

    CAS  Google Scholar 

  4. Pye, K. & Krinsley, D. H. Nature 301, 412–413 (1983).

    Article  ADS  Google Scholar 

  5. Krinsley, D. H., Pye, K. & Kearsley, A. T. Geol. Mag. 120, 109–114 (1983).

    Article  ADS  Google Scholar 

  6. Pye, K. & Krinsley, D. H. J. sedim. Petrol. (in the press).

  7. Hemingway, J. E. & Riddler, G. P. Trans. Instn. Min. Metall. B. appl. Earth Sci. 91, B175–B186 (1982).

    Google Scholar 

  8. Raiswell, R. Chem. Geol. 18, 227–244 (1976).

    Article  ADS  CAS  Google Scholar 

  9. Coleman, M. L. & Raiswell, R. Geochim. cosmochim. Acta 45, 329–340 (1981).

    Article  ADS  CAS  Google Scholar 

  10. Weaver, C. E. Bull. Am. Ass. petrol. Geol. 42, 254–271 (1958).

    CAS  Google Scholar 

  11. Biscaye, P. E. Bull. geol. Soc. Am. 76, 803–832 (1965).

    Article  CAS  Google Scholar 

  12. Griffin, J. J., Windom, H. & Goldberg, E. D. Deep Sea Res. 15, 433–459 (1968).

    Google Scholar 

  13. Rateev, M. A., Gorbunova, Z. N., Lisitzyn, A. P. & Nosov, G. L. Sedimentology 13, 21–43 (1969).

    Article  ADS  CAS  Google Scholar 

  14. Jeans, C. V. Clay Min. 9, 209–217 (1971).

    Article  ADS  CAS  Google Scholar 

  15. Porrenga, D. H. Mar. Geol. 5, 495–501 (1967).

    Article  ADS  Google Scholar 

  16. Rohrlich, V., Price, N. B. & Calvert, S. E. J. sedim. Petrol. 39, 624–631 (1969).

    CAS  Google Scholar 

  17. Hein, J. R., Allwardt, A. O. & Griggs, G. B. J. sedim. Petrol. 44, 562–571 (1974).

    Google Scholar 

  18. Birch, G. F., Willis, J. P. & Richard, R. S. Mar. Geol. 22, 271–284 (1976).

    Article  ADS  CAS  Google Scholar 

Download references

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Pye, K., Krinsley, D. Inter-layered clay stacks in Jurassic shales. Nature 304, 618–620 (1983). https://doi.org/10.1038/304618a0

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