Petrology of filicudi,aeolian archipelago |
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Authors: | L Villari S Nathan |
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Institution: | 1. CNR — Istituto Internationale di Vulcanologia, Catama, Italy 2. N.Z. Geological Survey, c/o University of Canterbury, Christchurch, New Zealand
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Abstract: | Volcanic rocks on the island of Filicudi are typical of the cale-alkaline association of the Aeolian archipelago, and range in composition from basalt to high-K andesite. All specimens contain abundant phenocrystic plagioclase (cores of An82–97, rims becoming progressively more sodic with increasing Differentiation Index), clinopyroxene, and magnetite; the most basic samples contain olivine, which is replaced by orthopyroxene at around D.I.=44. SiO2 generally increases with time, and this in conjunction with the continuity in mineralogy suggests that the lavas are the differentiation products of a single batch of magma. Least-squares mixing calculations are consistent with a shallow fractional model, as is the variation in trace element abundances. |
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