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• W1219839224 abstract "The Cretaceous flood basalts of northern Madagascar range in composition from picritic basalt to basaltic andesite with a serial affinity ranging from tholeiitic to slightly alkaline. Rare, more evolved rocks are represented by peraluminous rhyodacites and peralkaline rhyolites. The intrusive complexes have a large range of lithologies, from ultramafic (dunites, wehrlites, clinopyroxenites) to felsic (leucogabbros, syenites). We report here the chemical composition of olivine, Ca-rich and Ca- poor pyroxene, feldspar, Fe-Cr-Ti oxide, amphibole, glass and accessory phases; the significance of their variations for what concerns geothermobarometry and regional chemical correlations is also discussed. The evolution from the least to the most evolved compositions, and from the whole rocks towards the interstitial glasses, which are thought to be low- pressure residual liquid compositions, has been modelled with fractionation of the observed phases, leaving Mg- to Fe-rich gabbroic solids. Riassunto. — Le rocce vulcaniche Cretaciche del Madagascar settentrionale variano in compositione da basalto picritico fino ad andesite basaltica, con rare rocce piu evolute (riodaciti peralluminose, rioliti alcaline); l'affinita magmatica varia da tholeiitica a transizionale-alcalina. Le rocce intrusive hanno anch'esse un significativo intervallo compositivo, variando da duniti e wehrliti, fino a gabbri e sieniti. In questo lavoro sono riportate le composizioni dei principali minerali osservati (olivine, pirosseni, feldspati, ossidi, anfiboli e fasi accessorie), nonche dei vetri interstiziali. Inoltre, sono riportate le principali deduzioni termobarometriche e le correlazioni di significato regionale. L'evoluzione magmatica dalle composizioni piu primitive a quelle meno evolute e dalle rocce totali ai vetri interstiziali sono state modellate con processi di cristallizzazione frazionata delle fasi mineralogiche presenti, attraverso la sottrazione di composizione gabbrica s.l." @default.
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• W1219839224 date "2006-01-01" @default.
• W1219839224 modified "2023-09-22" @default.
• W1219839224 title "An overview of phase chemistry and magmatic evolution in the Cretaceous flood basalt province of northern Madagascar" @default.
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