Abstract
Bituminous coals from the Lower Cretaceous Korne Formation and the Upper Cretaceous Atane Formation of Nûgssuaq have been analyzed for organic compounds. In the Atane Formation n-C12- to n-C31-alkanes, C19- and C20-isoprenoids (pristane and phytane) and possibly C14-, C15-, and C16-isoprenoids are present. n-C9- to n-C28-acids, norphytanic acid and phytanic acid have also been detected. In the Korne Formation n-C14- to n-C27-alkanes, C19- and Czoisoprenoids and possibly C14- and C15-isoprenoids are present. n-C8- to n-C26 -acids, in addition C8- to C20-α, ω-diacids could be detected. The difference between the Korne flora (predominantly gymnosperms and ferns) and the Atane flora (dominated by angiosperms) is not apparent in the organic chemistry. Comparisons are made with extracts from Rhaetic-Liassic coal from the Kap Stewart Formation of East Greenland where only C14- and C16-acids and aromatic acids were detected.
Highlights
The comparison of extractable organic compounds from coals representing different plant groups and ages is continued with a study of the Cretaceous coal from West Greenland
The two coal samples investigated here were collected from the Lower Cretaceous Korne Formation and from the Upper Cretaceous Atane Formation of Niigssuaq, by one of the authors in 1956
From the same fraetion of sample GGU 9546 we have studied the mass spectra of fatty acids as methylesters by combined GC-MS investigations (Table 4)
Summary
Pterophyllum, Ptilophyllum and Otozamites, the conifers with Pagiophyllum and Sciadopitys as common species together with the ginkgophyte representatives Ginkgoites and Baiera. The Atane Formation outcrops on the south coast ofNugssuaq The most abundant Cretaceous flora comes from the Atane Formation. The gymnosperms are represented by conifers as Pagiophyllum, Sciadopitys, Elatocladus and Sequoiites, the ginkgophytes: Ginkgoites and Baiera and cycadophytes: Pseudoeyeas, Pterophyllum, Pseudoetenis and Williamsania. The Kome Formation eoal sample (GGU 9546) investigated for organie eompounds was collected from a layer about 1/2 m thick outcropping approximately J O m above sea level in a eoastal profile near Kuk 00 the north eoast of ugssuaq The sample from the Atane Formation investigated here (GGU 96(3) was eolleeted from a bed about 1 m thiek in the ravine Qaglorssup kua on the south eoast of NGgssuaq The rank of the coals is high volatile bitumillous A
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