Abstract
those of modern seawater and may be similar in composition to Silicic volcanic rocks from Socorro Island, Mexico, are dominantly hydrothermal fluids present at the summit of Socorro Island. porphyritic (alkali feldspar>sodic pyroxene±fayalite±Fe–Ti oxides±aenigmatite) peralkaline trachytes and rhyolites. Typical of silicic peralkaline rocks, those from Socorro are enriched in Na2O, K2O, FeO∗, Zr and Nb, and depleted in Al2O3, Sr and Ba relative to silicic metaluminous rocks. The ranges of Nd and Pb isotope
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