An aenigmatite-richterite-olivine trachyte from Puu Koae, West Maui, Hawaii
An aenigmatite-richterite-olivine trachyte from Puu Koae, West Maui, Hawaii
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产自夏威夷西毛伊岛 Puu Koae 的长辉石-里氏辉石-橄榄石粗面岩
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发表时间：
1978
期刊：
影响因子：
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通讯作者：
DeNtnlln Vnlon
中科院分区：
文献类型：
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作者：
DeNtnlln Vnlon
Puu Koae粗面岩在西毛伊岛的北岸形成了一个引人注目的球状圆顶。该粗面岩具有过铝成分，但含有碱性角闪石、无黑闪长岩、富铁橄榄石和钠质单斜辉石。这种矿物学组合表明，粗面岩是从过碱性熔体中结晶出来的，其成分在结晶时因钠的损失而发生变化。结论是，在毛伊岛演化的一个阶段就产生了过碱性的盐液。
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.