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Feigenson 1984

Feigenson, M.D. (1984). Geochemistry of Kauai volcanics and a mixing model for the origin of Hawaiian alkali basalts. Contributions to Mineralogy and Petrology 87(2): 109-119.

A model is developed to explain the major, trace element, strontium and neodymium isotopic characteristics. Alkali basalts and tholeiites analyzed in this study show a complete transition in Sr and Nd isotopes. There is a well-constrained array on a Nd-Sr isotope correlation plot, explained by two-component mixing of Kauai tholeiite magma and a small amount of melt of East Pacific Rise source rock. Implications of this model are: (1) the main source of Hawaiian shield-building tholeiites is a mixture of subducted crust, primitive mantle and depleted asthenosphere that has been homogenized prior to melting, (2) early alkalic volcanism (as at Loihi Seamount) will be characterized by greater isotopic heterogeneity than will late-stage alkali basalt production, and (3) there are two distinct types of alkalic lavas erupted towards the end of magmatism.

Keywords
alkali basalts; alkaline earth metals; asthenosphere; basalts;, crust; East Pacific Ocean Islands; evolution; genesis;, geochemistry; geochronology; Hawaii; igneous rocks; isotopes;, Kauai; lava; magmas; major elements; mantle; metals; models;, Nd-144/Nd-143; Nd/Sr; neodymium; Oceania; petrology; Polynesia;, rare earths; ratios; shield volcanoes; Sr-87/Sr-86; stable, isotopes; strontium; trace elements; United States; volcanic, rocks; volcanoes; volcanology, 01C, Mineralogy of non-silicates

Journal
Contributions to Mineralogy and Petrology
http://link.springer.de/link/service/journals/00710/

Publisher
Springer-Verlag New York Inc.
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New York, NY 10010
USA
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