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Petrogenesis of Tholeiitic Lavas from the Submarine Hana Ridge, Haleakala Volcano, Hawaii |
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| Authors: | REN ZHONG-YUAN; TAKAHASHI EIICHI; ORIHASHI YUJI; JOHNSON KEVIN T M |
| Institution: | 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 |
| Abstract: | Hana Ridge, the longest submarine rift zone in the Hawaiianisland chain, extending from Maui 140 km to the ESE, has a complexmorphology compared with other Hawaiian rift zones. A totalof 108 rock specimens have been collected from the submarineHana Ridge by six submersible dives. All of the rocks (76 bulkrocks analyzed) are tholeiitic basalts or picrites. Their majorelement 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 intermediatein composition between those of Kilauea and Mauna Loa. The compositionalcharacteristics of the lavas imply that clinopyroxene and garnetwere important residual phases during partial melting. The compositionsof olivine and glass (formerly melt) inclusions imply that regardlessof textural type (euhedral, subhedral–undeformed, deformed)olivine crystallized from host magmas. Using the most forsteriticolivine (Fo90·6) and partition coefficients |
| Keywords: | : Hawaii Haleakala volcano submarine Hana Ridge petrogenesis tholeiitic lavas |
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