H. A. Powers
G. A. Macdonald
1968
<p><span>Sixteen new chemical analyses of the later rocks of </span>Haleakala<span> </span>Volcano<span>, on the island of Maui, </span>Hawaii<span>, add to the differentiation picture for that </span>volcano<span>. The early rocks of the </span>volcano<span> are tholeiitic. These are followed by dominant hawaiites with less abundant alkalic olivine basalts, picrite-basalts of ankaramite type, and </span>a<span> few mugearites. Still later rocks, separated from earlier ones by </span>a<span> 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 </span>Haleakala<span>.</span></p>
application/pdf
10.1130/0016-7606(1968)79[877:AFCTTP]2.0.CO;2
en
Geological Society of America
A further contribution to the petrology of Haleakala volcano, Hawaii
article