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Origin of high-alumina basalt, andesite, and dacite magmas

Science

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Abstract

The typical volcanic rocks of most island arcs and eugeosynclines, and of some continental environments, are basalt, andesite, and dacite, of high alumina content. The high-alumina basalt differs from tholeiitic basalt primarily in having a greater content of the components of calcic plagioclase. Laboratory data indicate that in the upper mantle, below the level at which the basaltic component of mantle rock is transformed by pressure to eclogite or pyroxenite, the entire basaltic portion probably is melted within a narrow temperature range, but that above the level of that transformation plagioclase is melted selectively before pyroxene over a wide temperature range. The broad spectrum of high-alumina magmas may represent widely varying degrees of partial melting above the transformation level, whereas narrow-spectrum tholeiite magma may represent more complete melting beneath it.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Origin of high-alumina basalt, andesite, and dacite magmas
Series title:
Science
Volume
146
Issue:
3644
Year Published:
1964
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
635
Last page:
637
Number of Pages:
3