Journal of Petrology Advance Access originally published online on August 12, 2004
Journal of Petrology 2004 45(10):2067-2099; doi:10.1093/petrology/egh076
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Journal of Petrology 45(10) © Oxford University Press 2004; all rights reserved
Petrogenesis of Tholeiitic Lavas from the Submarine Hana Ridge, Haleakala Volcano, Hawaii
1 EARTH AND PLANETARY SCIENCES, TOKYO INSTITUTE OF TECHNOLOGY, 2-12-1 OOKAYAMA, MEGUROKU, 152-8551, JAPAN
2 EARTHQUAKE RESEARCH INSTITUTE, THE UNIVERSITY OF TOKYO, 1-1 YAYOI, BUNKYO-KU, TOKYO 113-0032, JAPAN
3 DEPARTMENT OF GEOLOGY AND GEOPHYSICS, UNIVERSITY OF HAWAII, HONOLULU, HI 96822, USA
* Corresponding author. Telephone: +81-3-5734-2338. Fax: +81-3-5734-3538. E-mail: ren{at}geo.titech.ac.jp
Hana Ridge, the longest submarine rift zone in the Hawaiian island chain, extending from Maui 140 km to the ESE, has a complex morphology compared with other Hawaiian rift zones. A total of 108 rock specimens have been collected from the submarine Hana Ridge by six submersible dives. All of the rocks (76 bulk rocks analyzed) are tholeiitic basalts or picrites. Their major element compositions, together with distinctively low Zr/Nb, Sr/Nb, and Ba/Nb, overlap those of Kilauea lavas. In contrast, the lavas forming the subaerial Honomanu shield are intermediate in composition between those of Kilauea and Mauna Loa. The compositional characteristics of the lavas imply that clinopyroxene and garnet were important residual phases during partial melting. The compositions of olivine and glass (formerly melt) inclusions imply that regardless of textural type (euhedral, subhedral–undeformed, deformed) olivine crystallized from host magmas. Using the most forsteritic olivine (Fo90·6) and partition coefficients 
and 
, the primary magma composition is constrained to have 
16·7% MgO and 8·4 wt % CaO. Modeling calculations using MELTS show that olivine first crystallized at 1380–1390°C and 0·1–0·3 GPa, under slightly hydrous conditions (0·5–1 wt % water).
KEY WORDS: Hawaii; Haleakala volcano; submarine Hana Ridge; petrogenesis; tholeiitic lavas
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Z.-Y. REN, T. SHIBATA, M. YOSHIKAWA, K. T. M. JOHNSON, and E. TAKAHASHI Isotope Compositions of Submarine Hana Ridge Lavas, Haleakala Volcano, Hawaii: Implications for Source Compositions, Melting Process and the Structure of the Hawaiian Plume J. Petrology, February 1, 2006; 47(2): 255 - 275. [Abstract] [Full Text] [PDF]
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