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Nd-Sr-Pb isotope constraints on the sources of West Maui volcano, Hawaii

Nature

By:
, ,
DOI: 10.1038/319478a0

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Abstract

The origin of the Emperor-Hawaiian volcanic chain is attributed to the northwesterly movement of the Pacific plate over a stationary mantle plume (hotspot)1. 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 sources2,3. In an attempt to test our earlier multiple-source model4, we have analysed 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. ?? 1986 Nature Publishing Group.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Nd-Sr-Pb isotope constraints on the sources of West Maui volcano, Hawaii
Series title:
Nature
DOI:
10.1038/319478a0
Volume
319
Issue:
6053
Year Published:
1986
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Nature
First page:
478
Last page:
480
Number of Pages:
3