EarthRef.org Reference Database (ERR) -- Velde 1978

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Velde 1978

Velde, D. (1978). An aenigmatite-richterite-olivine trachyte from Puu Koae, West Maui, Hawaii. American Mineralogist 63(7-8): 771-778.

The Puu Koae trachyte forms a conspicuous bulbous dome on the north shore of West Maui. This trachyte has a peraluminous composition, but contains alkali amphibole, aenigmatite, iron-rich olivine, and sodic clinopyroxene. This mineralogical association indicates that the trachyte crystallized from a peralkaline melt, and that its composition changed at the time of crystallization by loss of sodium. The conclusion is that peralkaline salic liquids have been produced at one stage of the evolution of the island of Maui.

Keywords
aenigmatite; amphibole group; arfvedsonite; chain silicates;, chemical composition; clinoamphibole; clinopyroxene; composition;, East Pacific Ocean Islands; electron probe data; feldspar;, genesis; Hawaii; igneous rocks; lava; Maui; Maui County Hawaii;, mineral composition; minerals; nesosilicates; Oceania; olivine;, olivine group; orthosilicates; oxides; petrology; Polynesia; Puu, Koae; pyroxene group; richterite; silicates; trachytes; United, States; volcanic rocks, 05, Igneous and metamorphic petrology

Journal
American Mineralogist
http://www.minsocam.org/MSA/AmMin/AmMineral.html

Publisher
The Mineralogical Society of America
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