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Evidence for transition from the Roman to the Tuscan Magmatic Provinces in Mts. Cimini olivinlatites

AuthorsGasperini, Daniela; Aulinas, M.; Gimeno, D.; Macera, P.; Fernandez-Turiel, J. L. ; Cimarelli, C.
Issue DateJun-2009
CitationGeochimica et Cosmochimica Acta 73(13) Supl 1: A417 (2009)
AbstractThe volcanic complex of Mts. Cimini (~1.35-0.90 Ma) represents the geographical and chronological transition between the Tuscan and the Roman Magmatic Provinces (TMP and RMP; central Italy). The olivinlatites of Mts. Cimini, the most mafic magmas which belong to the last phase of volcanic activity, group into two different main types, showing peculiar highly incompatible element ratios and Srisotope compositions. They also differ in terms of mineral chemistry and petrographic features. In particular, reversed zoned clinopyroxenes, the green cores of which show compositional similarity to the Roman-type clinopyroxenes, characterize only one of the two group of olivinlatites. By contrast, the second group of olivinlatites hosts clinopyroxenes which display chemical composition in the range of variation of those occurring in Tuscan lamproites. Such heterogeneity reflects the occurrence of a marble-cake mantle beneath central Italy, in which different portions, e.g., the TMP and the RMP mantle sources, are characterized by peculiar geochemical and petrographic features [1]. The last phase of activity of Mts. Cimini, in which parental magmas of both ultrapotassic alkaline and sub-alkaline magmas coexist in close spatial and temporal association, might sign a fundamental change of the marble-cake mantle portion undergoing partial melting. In this scenario, about 900ka ago, early Roman-type magma batches could have interacted with the Tuscan-type pristine magmas by mixing/mingling processes, before becoming predominant in central Italy. Thus, the Mts. Cimini olivinlatites marked the extinguishment of the TMP magma production in favour of partial melting of the RMP mantle region.
Description1 página.-- Resumen del trabajo presentado en la 19th Annual V.M. Goldschmidt Conference, V.M. Goldschmidt Conference.
Publisher version (URL)http://dx.doi.org/10.1016/j.gca.2009.05.001
Appears in Collections:(Geo3Bcn) Artículos
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