Abstract
Rock magnetic results from 8 profiles covering stratigraphically the northern part of the Early Tertiary volcanic province in North-East Greenland (73°30'-75°N) are summarised. Tests in the field revealed only reversed polarities, which are likely to fall in the time span between chron 24r and 26r. Mean magnetic susceptibilities from 60 sites (some 2100 in situ measurements), together with average values of the intensity of the NRM (based upon 160 samples from 37 flows and dykes) and corresponding Q ratios, are tabulated. The overall means and standard deviations are k = 0.010 SI (s.d. = 0.003), J = l.7 Atm (s.d. = l.3) and Q= 2.8 (s.d. = 3), respectively. The susceptibilities are normally distributed, in contrast to the NRM intensity values and the Q ratios, which tend to be log-normal distributed.
Highlights
Rock magnetic results from 8 profiles covering stratigraphically the northem part af the Early Tertiary volcanic province in North-East Greenland (73°30'-75°N) are summarised
In the Early Tertiary plateau basalts of the Scoresby Sund region the basalt succession investigated showed only reversed polarity (Tarling et al, 1988); the few normal polarities known from field measurements did not stand magnetic cleaning i.n the laboratory
Several reversals are known from the Early Tertiary vo1canic sequences in West Greenland
Summary
North-East Greenland were made (l) to provide geophysicai background information of the magnetic properties for aeromagnetic interpretations; and (2) to search for and identify stratigraphical polarity zones, which might be useful for regional correiation and dating by means of the marine magnetic anomaly scale. The combined profiles investigatcd magnetically cover thc greater part of the Early Tertiary vo!canic sequence in. North-East Greenland (73°30'-75°N); the most extensive areas of Tertiary basalts are exposed further south in the Scoresby Sund region of central East Greenland (Deer, 1976; Larsen et al, 1989). In 1989 (Nordgerd, 1991) about 2100 in situ measurements of the magnetic susceptibility (k) were made with a kappameter (Model KT-5, Geofyzika Bmo), and the polarity was estimated in the field by means of a portable fluxgate magnetometer (Model BR-2, FG Electronics). A coUeclion of orientated samples was obtained for more detailed palaeomagnetic studies in the laboratory, the results of which will be reported elsewhere
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