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Abstract
Clinopyroxenes belonging to ophiolitic metabasalts from the Mediterranean area were analysed by microprobe. They exhibit a wide range of composition in agreement with the geochemical variations of the host lavas. The analysed clinopyroxenes show a high Ti-Al and Si-Ti correlation. Their Ti/Al ratio ranges from about 0.5 to very low values as in the Troodos and Pindos samples. The data on the clinopyroxenes give further support to the hypothesis that the Western Mediterranean ophiolitic basalts with “oceanic” characters are generated under various conditions and from magmas with variable chemical characters. In particular the data contradict the hypothesis that all the Northern Apennines and Corsica metabasalts were produced at “normal ridge segments”. Moreover, the clinopyroxenes occurring in some lavas from Troodos (and Pindos?) resemble the clinopyroxenes of the island arc basalts. Thus, although geochemical features and clinopyroxene composition do not necessarily impose a generation at destructive margins for these lavas, this hypothesis cannot be rejected.
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