Item talk:Q66102
From geokb
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"name": "Trace element and Pb isotope composition of plagioclase from dome samples from the 2004-2005 eruption of Mount St. Helens, Washington",
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"abstract": "We report the results of in-situ laser ablation ICP\u2013MS \nanalyses of anorthite content, trace-element (Li, Ti, Sr, Ba, La, \nPr, Ce, Nd, Eu, Pb) concentrations, and Pb-isotope compositions \nin plagioclase from eight dome-dacite samples collected from \nthe 2004-5 eruption of Mount St. Helens and, for comparison, \nfrom three dome samples from 1981-85. For 2004-5 samples, \nplagioclase phenocrysts range in composition from An30 to \nAn80, with the majority An42-An65. With the exception of Li, the \nrange of trace-element abundances in plagioclase phenocrysts is \nlargely constant in material erupted between October 2004 and \nApril 2005 and is broadly consistent with the 1983-85 dome \nsamples. Anomalously high Li contents in the early stage of the \neruption are thought to reflect addition of Li to the upper part \nof the magma chamber immediately before eruption (within \n~1 year) by transfer of an alkali-enriched, exsolved vapor from \ndeep within the magma chamber. Other trace elements show \nsignificant correlations (at >99 percent confidence limits) with \nanorthite content in plagioclase phenocrysts--Ba, light rareearth elements (LREE), and Pb show positive correlations, \nwhereas Ti and Sr correlate negatively. Variations in plagioclase-melt partitioning as a function of anorthite content cannot \nexplain trace-element variations--in particular predicting \ntrends for Ti and Sr opposite to those observed. A simple model \ninvolving closed-system fractional crystallization of plagioclase \n+ hypersthene + amphibole + oxides largely reproduces the \nobserved trends. The model requires no gain or loss of plagioclase and is consistent with the lack of europium anomalies \nin bulk dacite samples. Analytical traverses within individual \nplagioclase phenocrysts support this model but also point to a \ndiversity of melt compositions present within the magma storage zone in which plagioclase crystallized.\nPlagioclase crystals from gabbronorite inclusions in three \ndacite samples have markedly different trace-element and Pbisotope compositions from those of plagioclase phenocrysts, \ndespite having a similar range of anorthite contents. Inclusions show some systematic differences from each other but \ntypically have higher Ti, Ba, LREE, and Pb and lower Sr and \nhave lower 208Pb/206Pb and 207Pb/206Pb ratios than coexisting \nplagioclase phenocrysts. The compositions of plagioclase from \ninclusions cannot be related to phenocryst compositions by \nany reasonable petrologic model. From this we suggest that \nthey are unlikely to represent magmatic cumulates or restite \ninclusions but instead are samples of mafic Tertiary basement \nfrom beneath the volcano.",
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