Rock magnetism of Tertiary volcanics from North-East Greenland

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.