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Macdonald & Powers 1968

Macdonald, G.A. and Powers, H.A. (1968). A further contribution to the petrology of Haleakala Volcano, Hawaii. Geological Society of America, Bulletin 79(7): 877-887.

Sixteen new chemical analyses of the later rocks of Haleakala Volcano, on the island of Maui, Hawaii, add to the differentiation picture for that volcano. The early rocks of the volcano are tholeiitic. These are followed by dominant hawaiites with less abundant alkalic olivine basalts, picrite-basalts of ankaramite type, and a few mugearites. Still later rocks, separated from earlier ones by a profound erosional unconformity, include some hawaiites and ankaramites, but are dominantly alkalic olivine basalts (basanitoids) containing as much as 16.5 percent normative nepheline, some of them transitional to ankaramite. The progression toward ultramafic strongly undersaturated rocks (nephelinites), characteristic of the post-erosional lavas of other Hawaiian volcanoes, appears to have just begun at Haleakala.

Keywords
analyses; basalt differentiation; basalts; East Pacific Ocean, Islands; evolution; geochemistry; Haleakala; Hawaii; igneous, rocks; magmas; major-element analyses; Maui; Maui County Hawaii;, Oceania; petrologic evidence; petrology; Polynesia; United States;, volcanic rocks; volcanoes; volcanology, 05, Igneous and metamorphic petrology

Journal
Geological Society of America, Bulletin
http://www.geosociety.org/pubs/index.htm

Publisher
The Geological Society of America
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Boulder, CO 80301
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