Electron microscopic observations of shale diagenesis, offshore Louisiana, USA, Gulf of Mexico

J. W. Kim, W. R. Bryant, J. S. Watkins, T. T. Tieh

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Scanning and transmission electron microscopic analyses of shale samples from offshore Louisiana, USA, Gulf of Mexico, reveal the relationship between mineralogical and microfabric changes during burial diagenesis. The local geopressured zone begins at 2200-m depth. Above that depth the shales are smectite-rich, generally lack particle orientation, and contain appreciable pores. Below the 2200-m depth, the shales become more illiterich with increasing burial, more crystalline, and less porous. Microfabric changes are mainly caused by compaction during burial diagenesis; mineralogical changes (smectite-to-illite) and crystal growth also play an important role in fabric alteration during deep burial diagenesis.

Original languageEnglish
Pages (from-to)234-240
Number of pages7
JournalGeo-Marine Letters
Volume18
Issue number3
Publication statusPublished - 1999

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Environmental Science (miscellaneous)
  • Geotechnical Engineering and Engineering Geology
  • Earth and Planetary Sciences (miscellaneous)

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