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 | |
| State | Published - 1991 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Ammonium substitution in illite during maturation of organic matter
AU - Williams, Lynda
AU - Ferrell, Ray E.
PY - 1991
Y1 - 1991
N2 - 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.
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
UR - http://www.scopus.com/inward/record.url?scp=0026311789&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026311789&partnerID=8YFLogxK
U2 - 10.1346/CCMN.1991.0390409
DO - 10.1346/CCMN.1991.0390409
M3 - Article
AN - SCOPUS:0026311789
VL - 39
SP - 400
EP - 408
JO - Clays and Clay Minerals
JF - Clays and Clay Minerals
SN - 0009-8604
IS - 4
ER -