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Staudigel, H., Zindler, A., Hart, S.R., Leslie, T., Chen, C.Y. and Clague, D.A. (1984). The isotope systematics of a juvenile intraplate volcano; Pb, Nd, and Sr isotope ratios of basalts from Loihi Seamount, Hawaii. Earth and Planetary Science Letters 69(1): 13-29. |
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Nd isotope ratios in alkali basalts show the largest relative variation (0.51291-0.51305), and include the nearly constant tholeiite value ( approximately 0.51297). Pb isotope ratios show similarly large ranges for tholeiites and alkali basalts and continue Tatsumoto's 'Loa' trend towards higher (super 206) Pb/ (super 204) Pb ratios, resulting in a substantial overlap with the 'Kea' trend. (super 206) Pb/ (super 204) Pb ratios for Loihi and other volcanoes along the Loa and Kea trends are observed to correlate with the age of the underlying lithosphere suggesting lithosphere involvement in the formation of Hawaiian tholeiites. Loihi lavas display no correlation of Nd, Sr, or Pb isotope ratios with major element compositions or eruptive age, in contrast with observation of some other Hawaiian volcanoes. Isotope data for Loihi, as well as average values for Hawaiian volcanoes, are not adequately explained by previously proposed two-end-member models; new models for the origin and the development of Hawaiian volcanoes must include mixing of at least three geochemically distinct source regions and allow for the involvement of heterogeneous oceanic lithosphere. |
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Keywords
alkali basalts; alkaline earth metals; basalts; basanite; crust;, East Pacific; East Pacific Ocean Islands; evolution; genesis;, geochemistry; Hawaii; igneous rocks; isotopes; lead; lithosphere;, Loihi Seamount; major elements; metals; mixing; models;, Nd-144/Nd-143; neodymium; North Pacific; Northeast Pacific;, Oceania; oceanic crust; Pacific Ocean; Pb-206/Pb-204; petrology;, Polynesia; radioactive isotopes; rare earths; seamounts;, Sr-87/Sr-86; stable isotopes; strontium; tholeiite; United States;, volcanic rocks; volcanoes, 02D Isotope geochemistry; 05A Igneous and metamorphic petrology |
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Publisher
Elsevier Science
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