Sample: 54-D-62
| Sample ID: | 54-D-62 [1] |
| Station ID: | 54-D-62 |
| AT Num: | |
| Volcano: | Makushin |
| Possible source: | |
| Eruption: | |
| Collector: | Drewes, Harald |
| Date sampled: | 1954-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | Feldspathic basalt porphyry from the Makushin volcanics 1 1/4 miles west of Wide Bay Cone. It is light gray to medium light gray and contains pyroxene phenocrysts one-third millimeter long. Phenocrysts compose 5 percent of the rock and include augite or diopside, which forms euhedral to anhedral crystals and crystal clusters. The groundmass has a felty to coarsely crystalline texture and includes abundant subhedral laths of sodic to calcic labradorite with normal zones and faint oscillatory zones, much granular and anhedral augite (?), and subhedral and anhedral olivine and magnetite. |
| 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