Sample: 54-D-84
| Sample ID: | 54-D-84 [1] |
| Station ID: | 54-D-84 |
| AT Num: | |
| Volcano: | Makushin |
| Possible source: | |
| Eruption: | |
| Collector: | Drewes, Harald |
| Date sampled: | 1954-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | Andesite vitrophyre from a flow of Eider Point basalt 4 miles northwest of Makushin Volcano. It is grayish black and contains plagioclase phenocrysts as large as 1 millimeter in sheeted and finely vesicular glass. Phenocrysts compose 1 percent of the rock and include euhedral to fragmental labradorite and traces of clinopyroxene and magnetite. The glassy groundmass has aligned microlites, dusty inclusions, and strong flow bands of light and dark streaks, and contains some euhedral cristobalite on vesicle walls. |
| 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.
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plate 75 PDF 6.7 MB
plate 76 PDF 113 KB
plate 77 PDF 250 KB
table 1 PDF 326 KB