Symplectite breakdown of Ca-rich almandines in upper amphibolite-facies Skagit Gneiss, North Cascades, Washington
作者： Peter Misch , Anthony C. Onyeagocha
DOI: 10.1007/BF00371006
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摘要: In upper amphibolite-facies Skagit Gneiss, certain rocks, usually carrying hornblende, display post-kinematic breakdown of almandine-rich garnets to symplectite consisting plagioclase plus biotite and/or hornblende. Other garnets, widespread in hornblende-free schists and gneisses, remained stable the end metamorphic cycle. Analysed with coronas have 14 30 mol.% grandite. A set free such 6 9% grandite contain relatively more pyrope.
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