--> ABSTRACT: Dating of Igneous Intrusives and Burial/Thermal History by Illite Geochronology of Clay Diagenesis in Shales, by Paul H. Nadeau and Per Emil Eliassen; #91019 (1996)
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Dating of Igneous Intrusives and Burial/Thermal History by Illite Geochronology of Clay Diagenesis in Shales

Previous HitPaulTop H. Nadeau and Per Emil Eliassen

Clay mineralogic and potassium-argon isotopic age analyses from well cutting samples on the East Flank of the V^phgrring Plateau, Norwegian Continental Shelf, are used to model the age of doleritic intrusives which were encountered in 50+m of this well. The results indicate that an age equal to or less than 60 MY +- 4 (Paleocene). Cuttings samples for the study came from three levels above the dolerite. The lowermost sample nearest the intrusive indicates that the temperatures here probably exceeded 200° C, and that the relatively elevated temperatures are probably confined to several tens of meters away from the dolerite. Model ages of detrital potassium bearing clay vary from 180 - 212 MY, and increase with depth. Dating of doleritic intrusives is important for the mal history reconstruction in the Voring Basin, where intrusive sills are often observed on seismic profiles. The doleritic intrusives are synchronous with major Tertiary rifting events in the North Atlantic.

AAPG Search and Discover Article #91019©1996 AAPG Convention and Exhibition 19-22 May 1996, San Diego, California