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Geochemistry of some volcanic rocks from south-eastern sicily: Rare earth and other trace element distribution

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Abstract

Some trace element data for volcanic rocks found at different levels, from Tertiary to Holocene, in south-eastern Sicily (Iblean Plateau and Mt. Etna) are presented and discussed in the present paper in order to better the information about the origin and relationships of the various rock types.

Four groups of volcanic rocks have been recognized on the basis of their major element chemistry: 1) low-K tholeiites, 2) associated alkali basalts to nephelinites of the Iblean Plateau (Upper Pliocene to Lower Pleistocene), 3) the basal subalkaline lavas of Mt. Etna, and 4) the alkalic suite rocks that make up the bulk of the volcano.

The distribution of Rb, Sr, Ni, Cr, Co, Cu, REE, Th and Sc suggests:

  1. i)

    an origin of the Iblean magmas by a different degree of partial melting of a Rb-poor and possibly slightly hetereogeneous mantle;

  2. ii)

    quite distinct source compositions for the Etnean magmas, relative to those of the Iblean area, on the basis of their Rb and Sr contents;

  3. iii)

    an origin of the alkalic rocks of Mt. Etna from independently generated magma(s) rather than by crystal fractionation of the Etnean subalkaline magmas or of a magma having the geochemical features of the Iblean alkali basalts; evidence for this is given by the distribution features of the incompatible elements showing an origin for these rocks from compositionally different parent magmas and/or an evolution under widely variable environmental conditions;

  4. iv)

    the primary character for the chemical differences observed in some of the Etnean subalkaline rocks that can be accounted for by different physico-chemical conditions at their source rather than by crystal fractionation processes.

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Work supported by C.N.R. (Grant 77.01134.05)

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Cristofolini, R., Albini, A., Di Girolamo, P. et al. Geochemistry of some volcanic rocks from south-eastern sicily: Rare earth and other trace element distribution. Bull Volcanol 44, 95–107 (1981). https://doi.org/10.1007/BF02598191

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