Ammonium substitution in illite during maturation of organic matter

Lynda B. Williams; Ray E. Ferrell

doi:10.1346/CCMN.1991.0390409

Ammonium substitution in illite during maturation of organic matter

Lynda B. Williams, Ray E. Ferrell

Research output: Contribution to journal › Article › peer-review

67 Scopus citations

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 language	English (US)
Pages (from-to)	400-408
Number of pages	9
Journal	Clays and Clay Minerals
Volume	39
Issue number	4
DOIs	https://doi.org/10.1346/CCMN.1991.0390409
State	Published - Aug 1991
Externally published	Yes

Keywords

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

ASJC Scopus subject areas

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

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title = "Ammonium substitution in illite during maturation of organic matter",

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.",

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AU - Williams, Lynda B.

AU - Ferrell, Ray E.

PY - 1991/8

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AB - 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.

KW - Ammonium substitution

KW - Fixed-ammonium

KW - Hydrocarbon generation

KW - Illite/smectite transformation

KW - Organic maturation

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Ammonium substitution in illite during maturation of organic matter

Abstract

Keywords

ASJC Scopus subject areas

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