Item talk:Q66117
From geokb
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"name": "Magmatic conditions and processes in the storage zone of the 2004-2006 Mount St. Helens dacite",
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"abstract": "The 2004-6 eruption of Mount St. Helens produced \ndacite that contains 40-50 volume percent phenocrysts of \nplagioclase, amphibole, low-Ca pyroxene, magnetite, and \nilmenite in a groundmass that is nearly totally crystallized. \nPhenocrysts of amphibole and pyroxene range from 3 to 5 \nmm long and are cyclically zoned, with one to three alternations of Fe- and Al-rich to Mg- and Si-rich layers showing \nlittle indication of phenocryst dissolution between zones. \nSimilar-size plagioclase phenocrysts also contain several \ncyclic zones ranging between ~An68 and An45-35. Textural evidence indicates that amphibole, pyroxene, and ilmenite began \nto crystallize before the most An-rich plagioclase. Magnetite \nand ilmenite phenocrysts are small (less than 100 \u03bcm), vary \nsomewhat in composition from grain to grain, and are sporadically zoned. Magnetite-ilmenite pairs yield temperatures \nof equilibration ranging from 820\u00b0C to 890\u00b0C and f\nO2\n values \nof NNO +1 log unit. Magnetite compositions suggest that the \n2004-6 magma was formed by mingling of magmas less than \n5-8 weeks before eruption and that the magma last equilibrated within this temperature range. The amphibole phenocryst zoning involves approximately equal amounts of a \npressure-sensitive Al-Tschermak molecular substitution and \na temperature-sensitive edenite substitution in one cycle of \ngrowth. Hydrothermal experiments done on the natural dacite \nshow that crystallization of the Fe- and Al-rich amphibole \nend member requires pressures of 200-300 MPa at temperatures of 900\u00b0C, conditions approaching the upper temperature limit of amphibole stability. The dacitic magma crystallizes the An68 plagioclase when the pressure drops to 200 \nMPa at 900\u00b0C. The magma must cool at this depth to produce \na complete An68-An40 plagioclase zone and a Mg-rich layer on the amphiboles before the magma is cycled back to a high \npressure, when a new layer of Fe-rich amphibole is acquired. \nThe amphibole crystallizing in the dacite experiments at less \nthan 200 MPa is lower in aluminum than any compositions \nin the natural cyclically zoned phenocrysts. The outer rim on \nsome 2004-6 amphibole phenocrysts appears to have formed \nin the 100-200 MPa range, as do some phenocrysts in the \nMay 1980 dacite pumice. Plagioclase rims of An35 in the \n2004-6 magmas indicate that phenocryst growth continued \nuntil the pressure decreased to 130 MPa and that ascent was \nslow until this depth. Magma then entered the conduit for a \nrelatively rapid ascent to the surface as indicated by the very \nthin (less than 5 \u03bcm) decompression-induced rims on the \namphibole phenocrysts.",
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