Irving, Anthony; Green, David
Experimental melting studies were conducted on a nepheline mugearite composition to pressures of 31 kbar in the presence of 0-30% added water. A temperature maximum in the near-liquidus stability of amphibole (with olivine) was found for a water content of 3·5 wt % at a pressure of 14 kbar. This is interpreted to have petrogenetic significance for the derivation of nepheline mugearite magmas from nepheline hawaiite by amphibole-dominated fractional crystallization at depth within the...[Show more]
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