Petrogenesis of the Lien peridotite and associated eclogites, Almklovdalen, Western Norway |
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| Authors: | L G Medaris Jr |
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| Institution: | Department of Geology and Geophysics, University of Wisconsin, Madison, Wisconsin 53706, U.S.A. |
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| Abstract: | Core and rim compositions of minerals in garnet-bearing assemblages in the Lien peridotite define a retrograde metamorphic trend from 820° C, 28.1 kbar, to 645° C, 17.6 kbar. Eclogites in Basal Gneiss near the peridotite contain a record of prograde metamorphism which converges with the retrograde trend of the ultramafic rocks. The Lien peridotite appears to have been derived from the upper mantle under eclogite facies conditions and emplaced into unusually thick continental crust during a Caledonian eclogite facies metamorphic event. |
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