Abstract
Ketilidian sedimentary rocks nearly 2000 m.y. old and only slightly metamorphosed have been shown to contain fossils and organic compounds. Results of work on organic material from a 1-3 m thick coal-graphite layer from the Foselv Formation in the Sortis Group in Grænseland are presented. Aliphatic (straight chain, branched and cyclic) hydrocarbons are dominant in the extract from two coal-graphite samples weighing about 4 kg and 10 kg respectively. Further investigations of these compounds have revealed many saturated straight-chain hydrocarbons, with the n-C15 alkane, the most abundant among the normal alkanes, ranging from C12 to about C21, and various isoalkanes and anteisoalkanes. Saturated cyclic hydrocarbons like alkyl cyclohexanes, and homologous series of alkyl benzenes and alkyl naphthalenes are also present. A series of monoterpenoid compounds is present. Six of them are fairly well characterized by their mass spectra. Fatty acids and methyl esters of fatty acids are present, notably a homologous series of straight-chain fatty acids. Branched acids are also present in minor amounts. The organic compounds further indicate that this Precambrian coal-graphite layer is the result of biological activity.
Highlights
The examinations have been carried out by the writers at the Geological Institute
In the earlier publication on the organic compounds from a coalgraphite sample (RAUNSGAARD PEDERSEN and LAM 1968) we mentioned the presence of aliphatic hydrocarbons (n-alkanes, branched and cyclic hydrocarbons)
Examinations of organic compounds extracted from large samples of a coal-graphite from the low-metamorphic part of the Ketilidian series of Grænseland have been carried out
Summary
Plutonic development of the Ilordleq area, South Greenland. The Eqaloqarfia layered dyke, Nunarssuit, South Greenland. Sanerutian appinitic rocks and Gardar dykes and diatremes, north of Narssarssuaq, South Greenland. Sorensenite, a new sodium-beryllium-tin-silicate from the Ilimaussaq intrusion, South Greenland.1965 by E. Eudidymite and epididymite from the Ilimaussaq alkaline intrusion, South Greenland. Superposed deformations of the Ketilidian gneisses of the Sårdloq area, South Greenland. The pattern of folding in an area of migmatites between Neria and Qasigialik fjords, South-West Greenland.
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