Melt-Solid Dihedral Angles of Common Minerals in Natural Rocks

doi:10.1093/petrology/egi094

Journal of Petrology Advance Access originally published online on December 20, 2005
Journal of Petrology 2006 47(4):791-800; doi:10.1093/petrology/egi094

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Melt–Solid Dihedral Angles of Common Minerals in Natural Rocks

M. B. HOLNESS^*

DEPARTMENT OF EARTH SCIENCES, UNIVERSITY OF CAMBRIDGE, DOWNING STREET, CAMBRIDGE CB2 3EQ, UK

RECEIVED MAY 5, 2005; ACCEPTED NOVEMBER 17, 2005

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

^* E-mail: marian{at}esc.cam.ac.uk

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