Ammonium substitution in illite during maturation of organic matter

Lynda Williams, Ray E. Ferrell

Research output: Contribution to journalArticle

62 Citations (Scopus)

Abstract

Pierre shale samples from a thin stratigraphic zone within the contact aureole of the lampro- phyric Walsen dike record changes due to thermal effects that are not influenced by detrital differences. Analyses of fixed-NH4, mineralogy, and Rock-Eval pyrolysis indicators of organic matter maturity provide new insights on the fixation process. Fixed-NH4 increases with the quantity of authigenic iUite formed from illite/smectite, but the maximum fixation per unit of illite formed occurs within the "oil window" where thermal breakdown of organic matter is rapid. Extrapolation of these results to the burial diagenetic regime supports the potential use of fixed-NH4 as an indicator of organic maturity and hydrocarbon migration pathways.

Original languageEnglish (US)
Pages (from-to)400-408
Number of pages9
JournalClays and Clay Minerals
Volume39
Issue number4
DOIs
StatePublished - 1991
Externally publishedYes

Fingerprint

illite
Ammonium Compounds
Biological materials
fixation
maturation
substitution
Substitution reactions
ammonium
organic matter
heat
hydrocarbon migration
Levees
aureole
Mineralogy
shale
smectite
pyrolysis
mineralogy
Shale
Hydrocarbons

Keywords

  • Ammonium substitution
  • Fixed-ammonium
  • Hydrocarbon generation
  • Illite/smectite transformation
  • Organic maturation

ASJC Scopus subject areas

  • Soil Science
  • Earth and Planetary Sciences (miscellaneous)
  • Geochemistry and Petrology
  • Water Science and Technology
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

Cite this

Ammonium substitution in illite during maturation of organic matter. / Williams, Lynda; Ferrell, Ray E.

In: Clays and Clay Minerals, Vol. 39, No. 4, 1991, p. 400-408.

Research output: Contribution to journalArticle

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