@inbook{2f46b23d30c9430889dad837cbc39313,
title = "Geochemical evolution of koolau volcano. Hawaii",
abstract = "Major and trace-element and Sr, Nd, and Pb isotopic compositions have been determined for Koolau shield lavas and Nuuanu and Wailau landslide deposits, Hawaii. The Koolau shield is composed of older main shield-stage and younger Makapuu-stage lavas. Lavas of the main shield-stage are exposed low in the subaerial Nuuanu Pali and in Nuuanu landslide deposits. Main shield-stage lavas resemble Loa- or Kea-type compositions; they are characterized by lower Ba/Nb, La/Nb, Pb/Nd, Sr/Nb, Nd/Nb, Zr/Nb, and 87Sr/86Sr, and by higher 143Nd/144Nd and 206Pb/204Pb than those of Makapuu-stage lavas (Koolau-type). Sr-Nd-Pb isotope systematics suggest that Koolau shield lavas were generated from at least three endmembers, such as: Enriched Makapuu (EMK), Depleted Makapuu (DMK), and Kea (KEA) components. The proportion of these endmembers successively changed from earlier KEA-dominated to later EMK-dominated. Koolau shield-stage lavas span nearly the entire range of the isotopic compositions reported previously for shield-stage lavas from all Hawaiian islands, and reveal secular changes in the amounts of plume components.",
author = "Ryoji Tanaka and Eizo Nakamura and Eiichi Takahashi",
note = "Funding Information: Acknowledgements. Many thanks to K. Shinozaki for constructive discussions and field assistance, R. Takeguchi for denoting samples, T. Kuritani, H. Takei, T. Moriguti, A. Makishima, T. Yokoyama, N. Takeuchi, and all the other PML members for expert analytical assistance and discussions, and K. Ozawa for variable suggestions and encouragement. We thank to G. E. Bebout, M. J. Walter, and K. Koga for improving the manuscript, P. Lipman, and F. Frey and E. Hauri for constructive reviews. We greatly acknowledge P. Lipman for his helpful suggestions and editing. This research was supported in part by grants-in-aid for Scientific Research from Ministry of Education, Culture, Sports, Science and Technology of Japanese Government and Japan Society for the Promotion of Science to E. N. and by JAMSTEC to E. T. Publisher Copyright: {\textcopyright} 2002 by the American Geophysical Union.",
year = "2002",
doi = "10.1029/GM128p0311",
language = "English",
isbn = "9780875909875",
series = "Geophysical Monograph Series",
publisher = "Blackwell Publishing Ltd",
pages = "311--332",
editor = "Garcia, {Michael O.} and Eiichi Takahashi and Jiro Naka and Lipman, {Peter W.} and Shigeo Aramaki",
booktitle = "Hawaiian Volcanoes",
}