Abstract
Geochemical maps and geochemical cross-sections, based on chemical analyses of the < 0.1 mm fraction of stream sediment samples collected at a density of approximately 1 sample per 30 km2 in central and western North Greenland, show that the distribution patterns for the major elements and some trace elements reflect the main lithological units of the North Greenland Palaeozoic platform and trough. By contrast the distribution patterns for S and Sr are different. High S values are correlated with zones of tectonic activity and are thought to indicate migration of H2S along faults. High Sr values are correlated with evaporitic rocks in the platform sequence and with deep sea carbonates. High BaO values occurring along the Silurian platform margin and in the Ordovician platform-slope sequence are the result of Ba enrichment in the sedimentary environment, combined with epigenetic vein-type baryte mineralisation.
Highlights
Geochemical maps and geochemical cross-sections, based on chemical analyses of the < 0.1 mm fraction of stream sediment samples collected at a density of approximately 1 sample per 30 km z in central and western North Greenland, show that the distribution patterns for the major elements and some trace elements reflect the main lithological units of the North Greenland Palaeozoic platform and trough
The stream sediment samples were collected at a density of 1 sample per 30 km2 throughout the region shown in fig
The Geological Survey of Greenland (GGD) plans to publish a geochemical atlas containing symbol maps for all elements, covering that part of North Greenland shown in fig. 1
Summary
Geochemical maps and geochemical cross-sections, based on chemical analyses of the < 0.1 mm fraction of stream sediment samples collected at a density of approximately 1 sample per 30 km z in central and western North Greenland, show that the distribution patterns for the major elements and some trace elements reflect the main lithological units of the North Greenland Palaeozoic platform and trough. High Sr values are correlated with evaporitic rocks in the platform sequence and with deep sea carbonates. Low density sampling of stream sediments for the geochemical mapping of central and western North Greenland was carried out in 1984 and 1985, as reported by Steenfelt (1985). The present contribution discusses the relationships of the regional geochemical pattern to the main rock units, and gives examples of the use of stream sediment data in geological interpretation.
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