Abstract
Abstract Intermediate and acid volcanic rocks from the Oraefajokull central volcano, southeast Iceland, are hybrids with calc-alkaline affinity. These rocks are characterized by basic xenocrysts of olivine, plagioclase, and clinopyroxene set in a glassy matrix. Linear variation curves for a number of major and trace elements show that the rocks are mixing products of basic and silicic members of the main series of the volcano. It is concluded that this mixing results from contamination of silicic melts by basaltic and gabbroic xenoliths.
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