Major element compositions of glass inclusions in olivine and plagioclase phenocrysts from representative Mariana arc lavas show that mafic Mariana arc liquids are tholeiitic and not high‐alumina, ...
Most of the alkali-rich, lime-poor porphyritic rocks of the Judith Mountains, Montana, contain phenocrysts of a single, optically homogeneous, alkali feldspar (cryptoperthite). A few rocks that are ...
Thirty-six rock units sampled from a 980 m borehole drilled into the island of Sao Miguel, Azores were analysed for major and trace elements. Twenty-four basalts, two trachybasalts, four trachytes, ...
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