Abstract
The Aeolian volcanic arc displays a wide range of magmatic products. Mafic lavas range from hypersthene normative calc-alkaline basalts to silica-undersaturated potassic absarokites, although the former are spatially and temporally dominant, consistent with the subduction-zone tectonic setting. In addition, intermediate and acidic members of the various fractionation series may be recognised. Large variations in trace element and isotope ratios accompany the rapid calc-alkaline to potassic transition, and it is argued that these may be largely explained in terms of subduction-zone mantle enrichment involving components derived from both basaltic ocean crust and subducted sediments. In addition, it seems that the mantle wedge itself was substantially heterogeneous prior to the onset of subduction zone processes. Not only are these subduction components similar to those proposed in a number of island arcs, but they also resemble those recognised in the ultra-potassic lavas of the Roman province, supporting recent subduction-related petrogenetic models of the Roman magmatism. Although subducted sediment plays an important role in the generation of some potassic magmatism, it is not uniquely responsible for K2O-rich lavas, which are also produced without a large sediment contribution.
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Ellam, R.M., Menzies, M.A., Hawkesworth, C.J. et al. The transition from calc-alkaline to potassic orogenic magmatism in the Aeolian Islands, Southern Italy. Bull Volcanol 50, 386–398 (1988). https://doi.org/10.1007/BF01050638
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DOI: https://doi.org/10.1007/BF01050638