The petrochemistry of ophiolite gabbroic complexes. A key for the classification of ophiolites into low-Ti and high-Ti types |
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| Authors: | Giancarlo Serri |
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| Institution: | Istituto di Mineralogia e Petrografia, Via S. Maria 53, 56100 Pisa Italy |
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| Abstract: | Ophiolites have been divided into two groups: high-Ti and low-Ti types. These can be discriminated by studying the fractionation trends of both gabbroic complexes (this work) and lavas and dykes 16], particularly in the TiO2/M.I. diagram. The first type typically shows MORB-like magmas whereas in the second the magma types have a spectrum of composition from mid-ocean ridge basalts to island arc tholeiites and boninite-like magmas often occur.High-Ti ophiolites are petrologically and geochemically similar to major oceanic and ensialic back-arc basin crusts as well as oceanic crust generated during the intermediate and late-stage opening of intraoceanic back-arc basins.Parental magmas and fractionation processes of low-Ti ophiolites fit with an hypothesis of their formation in the early stage of opening of intraoceanic back-arc basins. |
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