Sample: Barth_1956_19
| Sample ID: | Barth_1956_19 [1] |
| Station ID: | Barth_1956_19 |
| AT Num: | |
| Volcano: | St. George volcanic field |
| Possible source: | |
| Eruption: | |
| Collector: | Barth, T. F. W. |
| Date sampled: | 1948-01-01 |
| Sample type 1: | Lava |
| Color: | |
| Final unit: | |
| Text Description: | Sample of olivine basalt from Fox Castle. Fox Castle is a huge pile of loose lava blocks forming a “castle” which seems to represent the top of a dike or neck that has penetrated the tuffs in the Esogemunga fissure. The rock is well crystallized with conspicuously zoned laths of plagioclase, 1-2 mm long. According to their extinction angle the average composition is around An55. Intersertally are olivine, pyroxene, and some ore in grains of 0.1-0.5 mm. |
| Sample Location: |
References Cited
[1] Geology and petrology of the Pribilof Islands, Alaska, 1956
Barth, T. F. W., 1956, Geology and petrology of the Pribilof Islands, Alaska: in Investigations of Alaskan volcanoes, U.S. Geological Survey Bulletin 1028-F, p. 101-160, 2 sheets, scale unknown.
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