Melt-Solid Dihedral Angles of Common Minerals in Natural Rocks |
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| Authors: | HOLNESS M B |
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| Institution: | DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF CAMBRIDGE, DOWNING STREET, CAMBRIDGE CB2 3EQ, UK |
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| Abstract: | The melt–solid dihedral angle has been measured in a rangeof igneous rock types, ranging in composition from picrite,through basalt, phonolite, andesite and rhyolite, for the mineralsquartz, leucite, plagioclase, olivine, amphibole and clinopyroxene.Populations of up to 104 true 3-D angles were measured in eachsample using a universal stage mounted on an optical microscope.The median and standard deviation of the angle populations foreach mineral are distinct (plagioclase  25°, with standarddeviation (SD) 11°; clinopyroxene 38°, with SD 14°;olivine 29°, with SD 13°; quartz 18°, with SD 9°;leucite 20°, with SD 11°), with no control by eithermelt composition or degree of approach of the grains to theirequilibrium shapes. KEY WORDS: dihedral angle; textural equilibrium; universal stage |
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| Keywords: | : dihedral angle textural equilibrium universal stage |
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