Variable Impact of the Subducted Slab on Aleutian Island Arc Magma Sources: Evidence from Sr, Nd, Pb, and Hf Isotopes and Trace Element Abundances |
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| Authors: | JICHA, B. R. SINGER, B. S. BROPHY, J. G. FOURNELLE, J. H. JOHNSON, C. M. BEARD, B. L. LAPEN, T. J. MAHLEN, N. J. |
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| Affiliation: | 1 DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF WISCONSIN–MADISON, 1215 WEST DAYTON STREET, MADISON, WI 53706, USA
2 DEPARTMENT OF GEOLOGICAL SCIENCES, INDIANA UNIVERSITY, BLOOMINGTON, IN 47405, USA |
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| Abstract: | Major and trace element compositions and Sr, Nd, Pb, and Hfisotope ratios of Aleutian island arc lavas from Kanaga, Roundhead,Seguam, and Shishaldin volcanoes provide constraints on thecomposition and origin of the material transferred from thesubducted slab to the mantle wedge. 40Ar/39Ar dating indicatesthat the lavas erupted mainly during the last |
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| Keywords: | : Aleutian island arc 40Ar/39Ar dating fluids Hf isotopes magma sources |
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