151: K-Ar dates for Akutan lavas * a Date represents minimum age. b Samples analyzed by R. Armstrong, University of British Columbia, Vancouver, BC. All others analyzed by J. Blum and D. turner at the University of Alaska, Fairbanks. *

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152: Representative plagioclase analyses for Akutan lavas

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153: Selected clinopyroxene analyses from Akutan lavas

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154: Representative orthopyroxene analyses from Akutan lavas

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155: Representative olivine analyses for Akutan lavas

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156: Representative oxide analyses for Akutan lavas * nd, not determined. A Fe2O3 calculated based upon ideal stoichiometry *

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157: Selected analyses of amphibole from Akutan lavas

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158: Representative major element analyses of Akutan lavas * (a) whole rock analysis by X-ray fluorescence at AK Division of Geological and Geophysical Surveys lab, Fairbanks, AK. All others by electron microprobe. *

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159: Minor and trace element analyses of Akutan lavas

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160: Sr and Pb isotopic data for lavas from Akutan Island

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161: Major and trace element crystal fractionation models for Akutan lavas * %Diff is the percent difference between observed and calculated values. A successful model was considered to be one where the calculated values were within 10% of the observed values. See Table 9 for observed values. *If the major element mass balance calculation are ignored, all of the trace elements in AK81-35 can be reproduced by 5% fractionation of AK81-28. Given that AK81-35 erupted before AK81-28, open system behavior can explain the discrepancy between the calculated and observed trace element concentrations. Distribution coefficients were taken from Schnetzler and Philpotts (1970) and Philpotts and Schnetzler (1970). *

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