Abstract
The eclogite on Hareidland, western Norway, is among the largest eclogite bodies yet described. It occurs as a sheet-like body folded together with the surrounding metasedimentary gneisses of the basal gneiss complex of western Norway. The maximum surface extension of the body is about 6 km with the width varying between 0.2 and 1.5 km.
Relations between bulk chemical variation and mineralogical variation suggest that the mafic rock now found as eclogite probably crystallized as a gabbroic rock. Field and mineralogical evidence suggests simultaneous later metamorphism of the gabbro and the surrounding gneisses at a temperature and load pressure near 625±30°C and 14 kb. The temperature estimate is based on a “thermometer” which uses the distribution coefficient, \({\text{K}}_{{\text{ga}} - {\text{cpx}}}^{{\text{Fe}}^{{\text{2 + }}} - {\text{Mg}}}\).
Whole rock Rb-Sr dating indicates about 1700 m.y. as the age of the metamorphism of the gneisses and therefore also the age of the eclogite. The Sr87/Sr86-ratios of a few biotite and amphibole-rich samples suggest a later partial Rb-Sr homogenization (Caledonian?) of the gneisses on Hareidland.
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Publication no. 51 in “The Norwegian Geotraverse Project”.
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Mysen, B.O., Heier, K.S. Petrogenesis of eclogites in high grade metamorphic gneisses, exemplified by the Hareidland eclogite, western Norway. Contr. Mineral. and Petrol. 36, 73–94 (1972). https://doi.org/10.1007/BF00372836
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DOI: https://doi.org/10.1007/BF00372836