Five clinopyroxenes in the Hareidland eclogite,Western Norway |
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| Authors: | B O Mysen |
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| Institution: | (1) Mineralogisk-Geologisk Museum, Oslo 5, Norway;(2) Present address: Department of Geosciences, 228 Deike Building, The Pennsylvania State University, 16802 University Park, Pa., USA |
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| Abstract: | Five clinopyroxenes can be distinguished on petrographic and chemical grounds in the Hareidland eclogite. Of these, three are omphacites. It is suggested that all three were originally of the same composition and that their present chemical differences are due to differences in their immediate chemical environments during retrograde metamorphism of the eclogite. The other two clinopyroxenes are symplectitic, and chemically vary from sodic augite to jadeite-poor omphacite. They were formed by exsolution of a sodic component (sodic plagioclase) from a parental omphacite.Publication no. 49 in the Norwegian Geotraverse Project. |
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