Abstract
The melt microinclusions in phenocrysts of highmagnesium rocks (picrites, komatiites etc.) provide evidence for primary magma composition generated during partial melting of mantle material. We have studied the temperature of homogenisation and composition of heated, homogenised microinclusions in O1, CPX, and SP phenocrysts of picrites from East and West Greenland. During the early Tertiary, voluminous volcanic activity took place in West and East Greenland and was accompanied by rifting and separation from Canada and North Europe (Brooks, 1973; Holm et al., 1993). High magnesium lavas of picritic composition make up high proportion of the West Greenland province, but are substantial in East Greenland. Quantitative modelling of homogenised melt inclusion compositions indicates the more deep seated origin of West Greenland pirites (Upper Naujanguit, Nussuaq) as compared to picrites from East Greenland (Lower Lavas, Vandfaldsdal Formation) Ion microprobe data demonstrated a more depleted composition of primary melts from the West Greenland picrites. Results and discussion
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