Alaska Volcano Observatory - Volatiles, magma mixing, and the mechanism of eruption at Augustine volcano, Alaska

VOLATILES, MAGMA MIXING, AND THE MECHANISM OF ERUPTION AT AUGUSTINE VOLCANO, ALASKA

Johnston, D. A., 1978, Volatiles, magma mixing, and the mechanism of eruption at Augustine volcano, Alaska: University of Washington Ph.D. dissertation, 187 p., 20 plates, scale unknown.

DATA TABLES *Not all tables in a publication may be listed. Not all tables from a publication have data entered in the database.

4221: Composition of groundmass of pumices and blocks erupted in January and February (Wt.%).

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* a. Na2O-analyses are unreliable due to volatilization during microprobe analysis. Each reported analysis is an average of 5-20 separate spot analyses. In separate microprobe runs no attempts were made to reoccupy earlier analysis spots. Due to the presence of microcrystals in the groundmass of andesitic pumices, analyses 1 and 2 in this table are unreliable. Standard deviation reported for analysis 3 is typical of rhyolitic glasses. *

SAMPLES

P2-5
J2-6
AUG-4
P2-5(1)
P2-5(3)
P2-5(4)

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