Alaska Volcano Observatory - Petrography, chemistry, and geologic history of Yantarni volcano, Aleutian volcanic arc, Alaska

PETROGRAPHY, CHEMISTRY, AND GEOLOGIC HISTORY OF YANTARNI VOLCANO, ALEUTIAN VOLCANIC ARC, ALASKA

Riehle, J. R., Yount, M. E., and Miller, T. P., 1987, Petrography, chemistry, and geologic history of Yantarni volcano, Aleutian volcanic arc, Alaska: U.S. Geological Survey Bulletin 1761, 27 p., 1 sheet, scale 1:63,360.

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178: Major element whole rock analyses of Yantarni samples

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* ¹Analyses from F.H. Wilson (oral commun., 1985). ²Loss on ignition to 925oC for 40 minutes. Value reported here has been corrected for oxidation of FeO to Fe2O3 and should include only volatiles. *

179: Petrographic descriptions of Yantarni samples

* ¹Description modified from F.H. Wilson (oral commun., 1985) for inclusion here. ²Includes 10.5 percent alteration pseudomorphs, formerly hornblende(?) microphenocrysts. (^3) Modes here are exclusive of a single large lithic clast consisting of porphyritic diabase. (^4)Includes 6.8 percent alteration pseudomorphs, formerly mafic phenocrysts. (^5)Includes 7.5 percent alteration pseudomorphs, formerly mafic(?) phenocrysts. *

180: Radiometric age determinations of Yantarni samples

* Analysts: Argon and age calculation, F.H. Wilson, N. Shew, and G.D. DuBois; potassium, S. Neil. Data provided by F.H. Wilson. *

181: Analyses of representative pyroxene phenocrysts from Yantarni Volcano

* Iron partitioning and structural distribution by the method of Papike and others (1974). Exoct, excess of cations beyond these necessary to fill the octahedral site; quad, percentage of total cations accounted for in the pyroxene "quadrilateral' (Wo-En-Fs); other, percentage of cations other than those of the pyroxene quadrilateral. *

182: Analyses of representative olivine phenocrysts from Yantarni Volcano

183: Analyses of representative plagioclase phenocrysts from Yantarni Volcano

184: Analyses of representative amphibole phenocrysts from Yantarni Volcano

185: Residual sums of squares for each of seven major oxides regressed against SiO2

* A quadratic expression fits the variation plots only slightly better than a linear expression. Regressions performed by Merribeth Bruntz, U.S. Geological Survey. *

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