Eclogite-amphibolite on the Molde peninsula, Southern Norway.
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The Molde peninsula, on the north-western coast of Southern Norway, consists mainly of quartzdioritic, granodioritic, and granitic gneisses. Numerous lenses in the gneiss and three larger zones in the central part of the peninsula are composed of dark, basic rocks, such as eclogite, eclogiteamphibolite, garnet amphibolite and amphibolite. Embedded in these three zones are several occurrences of calcite marble.
The mutual connection between the dark, basic rocks is examined, and it is proved that they have passed trough an increasing metamorphism up to eclogite facies, and then through a diaphtorism to epidote amphibolite facies. A complete equilibrium has not been attained at any stage and the different mineral associations represent relics. The rocks are called eclogite-amphibolite, after the most common mineral parageneses. The eclogite-hornblende gabbro is thought to rcpresent a stage in this metamorphic series. There follows a discussion of the genesis of the eclogite-amphibolite and of the age of the Molde peninsula.