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Sample info : 54-D-65
Sample ID:54-D-65
Station ID:54-D-65
Date Sampled:1954-01-01
Sample Type 1:Lava
Sample Type 2:Flow
Field Lithology:Basalt
Text Description:
Olivine basalt porphyry from an Eider Point basalt flow three fourths mile southwest of Wide Bay Cone. It is medium gray and vuggy, and contains pyroxene and olivine phenocrysts 1-4 millimeters long. Phenocrysts compose 20 percent of the rock: 10 percent sodic bytownite, which forms euhedral laths, stubby crystals, and fragments, and which has normal zones, rare oscillatory zones, zones of dusty inclusions, and apatite inclusions; 5 percent augite(?), which forms euhedral to anhdral grains and embayed crystals, and which is faintly zoned; and 5 percent olivine, which forms subhedral to anhedral crystals and embayed crystals. The groundmass has an intergranular texture and consists of abundant stubby subhedral calcic andesine, much granular clinopyroxene and a black opaque mineral, and traces of olivine and tridymite.

Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska

Sample Location

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Page modified: August 7, 2013 07:43
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