Diagenesis of organic matter and fine clay minerals: a comparative study
Summarization: A geochemical study has been made of fine clay minerals and organic matter in subsurface shale samples from the Canadian Northwest Territories. The mixed layer clays comprise smectite-vermiculite-illite but are transformed during thermal diagenesis to a pseudo-quaternary system (smect...
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fttunivcrete:oai:dlib.tuc.gr:62468 2023-12-17T10:47:42+01:00 Diagenesis of organic matter and fine clay minerals: a comparative study Snowdon, L.R(http://viaf.org/viaf/244090245) P. R. Gunther() T. G. Powell() Φωσκολος Αντωνης(http://users.isc.tuc.gr/~afoskolos) Foskolos Antonis(http://users.isc.tuc.gr/~afoskolos) Published at: 2015-12-05 http://purl.tuc.gr/dl/dias/7F74544D-71FC-47EB-94CB-CAC0638340B4 http://www.sciencedirect.com/science/article/pii/0016703778901138 10.1016/0016-7037(78)90113-8 en eng Elsevier info:eu-repo/grantAgreement/EC/FP7/246686 http://purl.tuc.gr/dl/dias/7F74544D-71FC-47EB-94CB-CAC0638340B4 http://www.sciencedirect.com/science/article/pii/0016703778901138 10.1016/0016-7037(78)90113-8 info:eu-repo/semantics/openAccess Όροι χρήσης: Μη διαθέσιμο License: http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/article peer-reviewed 2015 fttunivcrete 2023-11-23T17:38:53Z Summarization: A geochemical study has been made of fine clay minerals and organic matter in subsurface shale samples from the Canadian Northwest Territories. The mixed layer clays comprise smectite-vermiculite-illite but are transformed during thermal diagenesis to a pseudo-quaternary system (smectitevermiculite-illite-chlorite) by incorporation of amorphous inorganic material. The first clay dehydration occurs prior to hydrocarbon generation and is accompanied by adsorption of K+ and substitution of Al3+ for Si4+ in the clay lattice. Vermiculite is an intermediary in the transformation of smectite to illite and in the presence of Ca2+ ions delays the second dehydration step to the zone where cracking of liquid hydrocarbons to gas occurs. Hydrocarbon generation commences at a vitrinite reflectance level of ≅ 0.5% R0 maximum in both amorphous and woody-herbaceous organic matter but does not reach a significant level in the latter case until reflectance levels of 0.7% R0 maximum. The pristane to phytane ratio and proportion of n-alkanes and acyclic isoprenoids increase during hydrocarbon generation from woody-herbaceous organic matter. Anomalous hydrocarbon yields from certain samples are attributed to high concentrations of plant resins. Destructions of liquid hydrocarbons by cracking commences at a reflectance level of 1.0% R0 maximum and is essentially complete by a reflectance level of 1.4% R0 maximum. The proportion of n-alkanes in the saturates decreases during cracking of the liquid hydrocarbons. Presented on: Geochimica et Cosmochimica Acta Article in Journal/Newspaper Northwest Territories Technical University of Crete: Institutional Repository Northwest Territories |
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Technical University of Crete: Institutional Repository |
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Summarization: A geochemical study has been made of fine clay minerals and organic matter in subsurface shale samples from the Canadian Northwest Territories. The mixed layer clays comprise smectite-vermiculite-illite but are transformed during thermal diagenesis to a pseudo-quaternary system (smectitevermiculite-illite-chlorite) by incorporation of amorphous inorganic material. The first clay dehydration occurs prior to hydrocarbon generation and is accompanied by adsorption of K+ and substitution of Al3+ for Si4+ in the clay lattice. Vermiculite is an intermediary in the transformation of smectite to illite and in the presence of Ca2+ ions delays the second dehydration step to the zone where cracking of liquid hydrocarbons to gas occurs. Hydrocarbon generation commences at a vitrinite reflectance level of ≅ 0.5% R0 maximum in both amorphous and woody-herbaceous organic matter but does not reach a significant level in the latter case until reflectance levels of 0.7% R0 maximum. The pristane to phytane ratio and proportion of n-alkanes and acyclic isoprenoids increase during hydrocarbon generation from woody-herbaceous organic matter. Anomalous hydrocarbon yields from certain samples are attributed to high concentrations of plant resins. Destructions of liquid hydrocarbons by cracking commences at a reflectance level of 1.0% R0 maximum and is essentially complete by a reflectance level of 1.4% R0 maximum. The proportion of n-alkanes in the saturates decreases during cracking of the liquid hydrocarbons. Presented on: Geochimica et Cosmochimica Acta |
format |
Article in Journal/Newspaper |
author |
Snowdon, L.R(http://viaf.org/viaf/244090245) P. R. Gunther() T. G. Powell() Φωσκολος Αντωνης(http://users.isc.tuc.gr/~afoskolos) Foskolos Antonis(http://users.isc.tuc.gr/~afoskolos) |
spellingShingle |
Snowdon, L.R(http://viaf.org/viaf/244090245) P. R. Gunther() T. G. Powell() Φωσκολος Αντωνης(http://users.isc.tuc.gr/~afoskolos) Foskolos Antonis(http://users.isc.tuc.gr/~afoskolos) Diagenesis of organic matter and fine clay minerals: a comparative study |
author_facet |
Snowdon, L.R(http://viaf.org/viaf/244090245) P. R. Gunther() T. G. Powell() Φωσκολος Αντωνης(http://users.isc.tuc.gr/~afoskolos) Foskolos Antonis(http://users.isc.tuc.gr/~afoskolos) |
author_sort |
Snowdon, L.R(http://viaf.org/viaf/244090245) |
title |
Diagenesis of organic matter and fine clay minerals: a comparative study |
title_short |
Diagenesis of organic matter and fine clay minerals: a comparative study |
title_full |
Diagenesis of organic matter and fine clay minerals: a comparative study |
title_fullStr |
Diagenesis of organic matter and fine clay minerals: a comparative study |
title_full_unstemmed |
Diagenesis of organic matter and fine clay minerals: a comparative study |
title_sort |
diagenesis of organic matter and fine clay minerals: a comparative study |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://purl.tuc.gr/dl/dias/7F74544D-71FC-47EB-94CB-CAC0638340B4 http://www.sciencedirect.com/science/article/pii/0016703778901138 10.1016/0016-7037(78)90113-8 |
geographic |
Northwest Territories |
geographic_facet |
Northwest Territories |
genre |
Northwest Territories |
genre_facet |
Northwest Territories |
op_relation |
info:eu-repo/grantAgreement/EC/FP7/246686 http://purl.tuc.gr/dl/dias/7F74544D-71FC-47EB-94CB-CAC0638340B4 http://www.sciencedirect.com/science/article/pii/0016703778901138 10.1016/0016-7037(78)90113-8 |
op_rights |
info:eu-repo/semantics/openAccess Όροι χρήσης: Μη διαθέσιμο License: http://creativecommons.org/licenses/by/4.0/ |
_version_ |
1785571632770711552 |