Abstract
The fully cored Upper Jurassic succession in the Blokelv-1 borehole in the Jameson Land Basin, East Greenland, is intersected by igneous intrusions at four levels; the intrusions comprise a c. 15 cm thick dyke and three sills with thicknesses of 0.7, 1.2 and 1.9 m. The sills consist of fine-grained, sparsely plagioclase-olivine-phyric basalt with chilled contacts to the sediments. Analyses of two sills gave very similar results. The sills are tholeiitic basalts with compositions similar to the main group of dykes and sills in the Jameson Land Basin, and the Blokelv-1 sills are thus considered to belong to this group which has been dated at c. 53 Ma. The intrusions form part of a 55–51 Ma suite of tholeiitic basalt intrusions that was emplaced over an area extending for over 500 km north-to-south within the sedimentary basins of East and North-East Greenland.
Highlights
The fully cored Upper Jurassic succession in the Blokelv-1 borehole in the Jameson Land Basin, East Greenland, is intersected by igneous intrusions at four levels; the intrusions comprise a c. 15 cm thick dyke and three sills with thicknesses of 0.7, 1.2 and 1.9 m
The sediments in Jameson Land are intruded by many Cenozoic dykes and sills (e.g. Noe-Nygaard 1976; Hald & Tegner 2000), and one of the site selection criteria was to minimise the risk of encountering thick igneous intrusions during drilling
The purpose of this paper is to present descriptions and analyses of these intrusions and compare them with other Cenozoic dyke and sill intrusions in northern East Greenland
Summary
The fully cored Upper Jurassic succession in the Blokelv-1 borehole in the Jameson Land Basin, East Greenland, is intersected by igneous intrusions at four levels; the intrusions comprise a c. 15 cm thick dyke and three sills with thicknesses of 0.7, 1.2 and 1.9 m. The fully cored Upper Jurassic succession in the Blokelv-1 borehole in the Jameson Land Basin, East Greenland, is intersected by igneous intrusions at four levels; the intrusions comprise a c. The sills consist of fine-grained, sparsely plagioclase-olivine-phyric basalt with chilled contacts to the sediments. The fully cored Blokelv-1 borehole was drilled in 2008 through Upper Jurassic sediments in the Jameson Land Basin, East Greenland (Bojesen-Koefoed et al 2009), in order to study the sedimentary succession (Fig. 1A). Major intrusions were avoided, the 233.8 m succession in the Blokelv-1 core is cut by intrusive igneous rocks at four levels with a combined thickness of 4.1 m (Fig. 1B). The core is cut by igneous intrusions at four levels in the upper half of the section: 102.04–100.1 m A fracture is filled with biodegraded oil (BojesenKoefoed et al 2018, this volume)
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