1. Department of Natural Sciences; Hawai‘i Pacific University; 45-045 Kamehameha Hwy, Kāne‘ohe Hawaii 96744 USA
2. Department of Geology and Geophysics; University of Hawai‘i, Honolulu; Hawaii USA
3. Department of Geological Sciences; San Diego State University; San Diego California USA
4. Now at U. S. Geological Survey; Denver Federal Center; Denver Colorado USA
5. Pacific Centre for Isotopic and Geochemical Research; Department of Earth and Ocean Sciences; University of British Columbia; Vancouver British Columbia Canada
6. Department of Terrestrial Magnetism; Carnegie Institution; Washington, D.C. USA
7. Ronald B. Gilmore XRF Lab; Department of Geosciences; University of Massachusetts; Amherst Massachusetts USA
8. Planetary and Geological Sciences Institute; California Institute of Technology; Pasadena California USA