Superferric eclogites of the Voltri Group (Pennidic Belt,Apennines) |
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| Authors: | A Mottana R Bocohio |
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| Institution: | 1. Istituto di Mineralogia, Università di Milano, Italia
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| Abstract: | Eologites interlayered with serpentinites of the Voltri Group show a distinctive chemical composition, high in total iron and titania, and low in magnesia, silica and certain trace elements. Petrographic evidence indicates that they were formed by high-pressure metamorphism of coarse-grained gabbros, as well as from fine-grained gabbros or diabases. Their composition does not compare well with that of other eclogites, either those included in ultramafic rocks or those occurring in blueschist facies terrains. However it matches relatively well with that of certain gabbros from the Mid-Atlantic Ridge which are strongly fractionated with iron and titanium enrichment. The hypothesis that the Voltri Group maficultramafic association formed as a part of an oceanic ridge receives support. |
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