Sample: 54-D-65
| Sample ID: | 54-D-65 [1] |
| Station ID: | 54-D-65 |
| AT Num: | |
| Volcano: | Wide Bay cone |
| Possible source: | |
| Eruption: | |
| Collector: | Drewes, Harald |
| Date sampled: | 1954-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| 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 anhedral 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. |
| Sample Location: |
References Cited
[1] Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska, 1961
Drewes, Harald, Fraser, G. D., Snyder, G. L., and Barnett, H. F. Jr., 1961, Geology of Unalaska Island and adjacent insular shelf, Aleutian Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-S, p. 583-676, 3 sheets, scale 2 at 1:250,000 and 1 unknown.
full-text PDF 3.3 MB
plate 75 PDF 6.7 MB
plate 76 PDF 113 KB
plate 77 PDF 250 KB
table 1 PDF 326 KB