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Sample: SWPT1

Sample ID: SWPT1 [1]
Station ID: SWPT1
AT Num:
Volcano: St. Paul Island
Possible source:
Eruption:
Collector: Winer, G. S.
Date sampled:
Sample type 1: Lava
Color:
Final unit:
Text Description: From Feeley and Winer (1999): "Samples prefixed SWP- were collected from lava flows that are well exposed in coastal cliffs at Southwest Point. Here at least two lava flows are present. The lower flow (SWPB1) is ~2.4 m thick and has poorly developed columnar jointing. This flow is covered by a thin layer (~0.5 m) of sediments, suggesting a significant hiatus prior to eruption of the overlying units. Samples SWPT1, -2, and -3 are from thin (<1m) poorly vesiculated lava horizons separated by autoclastic breccia zones. Although these units are petrographically distinct in hand specimen and thin section, geochemically they are very similar, suggesting that they represent either eruption of three compositionally similar flows or different lobes of a single compound flow."
Sample Location:

References Cited

[1] Evidence for fractionation of Quaternary basalts on St. Paul Island, Alaska, with implications for the development of shallow magma chambers beneath Bering Sea volcanoes, 1999

Feeley, T. C., and Winer, G. S., 1999, Evidence for fractionation of Quaternary basalts on St. Paul Island, Alaska, with implications for the development of shallow magma chambers beneath Bering Sea volcanoes: Lithos, v. 46, n. 4, p. 661-676.