|Titre||Detrital petrology and mineralogy of the cored intervals of Lower Cretaceous sedimentary rocks in the Esperanto K-78, Hesper I-92, and South Griffin J-13 wells, Scotian Shelf|
|Auteur||Pe-Piper, G; Piper, D J W; Gould, K M; DeCoste, A|
|Source||Commission géologique du Canada, Dossier public 6821, 2011, 121 pages, https://doi.org/10.4095/288058 (Accès ouvert)|
|Éditeur||Ressources naturelles Canada|
|Media||en ligne; numérique|
|Province||Région extracotière de l'est|
|Lat/Long OENS||-59.0000 -57.0000 44.5000 43.5000|
|Sujets||faciès diagénétiques; diagenèse; Crétacé inférieur; pétrographie; puits; pétrologie du sediment; interprétations géochimiques; minéraux détritiques; géochimie des roches totales; carottes; lithologie;
grès; lithofaciès; Formation de Missisauga ; Formation de Logan Canyon ; minéralogie; sédimentologie; géochimie; géologie marine; Mésozoïque; Crétacé|
|Illustrations||location maps; tables; stratigraphic columns; photographs; ternary diagrams; plots|
|Programme||Analyse de bassin et ressources géoscientifiques, Géoscience en mer|
|Diffusé||2011 03 18; 2011 03 18|
|Résumé||(disponible en anglais seulement)|
Short conventional cores have been studied from the Middle Member of the Missisauga Formation from the Esperanto K-78 and South Griffin J-13 wells and from the
lower Naskapi Member in Hesper I-52. Cores were described and photographs. Samples were examined by petrographic microscope and in some cases by SEM and electron microprobe. Tidal parasequences are found in cores from Esperanto K-78 and South Griffin
J-13, whereas at Hesper I-52, a shoreface parasequence was sampled. The stratigraphic position of the core from Hesper I-52 was reassessed, with the aid of new biostratigraphic data; the core does not sample the top-Missisauga unconformity, as
Features of the detrital petrology are similar to equivalent stratigraphic levels in Peskowesk A-99, including the low abundance of stable heavy minerals, the preponderance of K-feldspar relative to plagioclase, and the
abundance of lithic clasts of microgranite and rhyolite. The new data confirms that there was a change in sediment supply in the Upper Member of the Missisauga Formation.
Diagenesis of the sandstones is characterized by low abundances of
diagenetic carbonates and porosity principally cemented by clay minerals. The paragenetic sequence suggests that kaolinite, calcite, siderite and pyrite are the principal eogenetic minerals, followed
by quartz overgrowths, chlorite, illite, and
further silica cement. In addition, silica cement is abundant at South Griffin J-13. The occurrence of diagenetic sphalerite at South Griffin J-13 suggests hot, saline basinal fluids were present.
Collectively, these data show that the previous
detailed interpretations of detrital petrology and diagenesis from the Peskowesk A-99 extend to a large area of the eastern Scotian Basin.