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Hegner, E., Unruh, D.M. and Tatsumoto, M. (1986). Nd-Sr-Pb isotope constraints on the sources of West Maui Volcano, Hawaii. Nature 319(6053): 478-480. |
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The origin of the Emperor-Hawaiian volcanic chain is attributed to the northwesterly movement of the Pacific plate over a stationary mantle plume (hotspot). There has been considerable controversy as to the nature and number of sources of Hawaiian hotspot volcanism. Thus far, most geochemical models have been based on rock suites that are not representative of fully developed volcanoes. Nd and Sr Isotope ratios and trace element concentrations of volcanics from Haleakala (Maui), where all three volcanic stages are developed, have been interpreted as reflecting a mixing process of two isotopically distinct sources. In an attempt to test our earlier multiple-source model, we have analyzed Pb, Sr and Nd isotope ratios in volcanics from West Maui, the only other volcano with a complete volcanic record. Our results, presented here, indicate at least three isotopically distinct sources, one of which is heterogeneous with respect to Pb. Furthermore, the inferred depleted source for post-erosional volcanics has a Pb and Sr isotope composition intermediate between those of depleted and enriched mid-ocean ridge basalts (MORB, N-type and P-type), suggesting that this source is also heterogeneous. |
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Keywords
alkaline earth metals; East Pacific Ocean Islands; genesis;, geochemistry; Hawaii; igneous rocks; isotopes; lava; lead; magmas;, Maui; Maui County Hawaii; metals; Nd-144/Nd-143; neodymium;, Oceania; parent materials; Pb-206/Pb-204; Pb-207/Pb-204;, Pb-208/Pb-204; Polynesia; radioactive isotopes; rare earths;, ratios; Sr-87/Sr-86; stable isotopes; strontium; United States;, volcanic rocks; volcanoes; volcanology; West Maui Volcano, 02D Isotope geochemistry; 05A Igneous and metamorphic petrology |
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