Item talk:Q239477
From geokb
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"name": "Oxygen and U-Th isotopes and the timescales of hydrothermal exchange and melting in granitoid wall rocks at Mount Mazama, Crater Lake, Oregon",
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"abstract": "We report new whole rock U-Th and\u00a0in-situ\u00a0oxygen isotope compositions for partially melted (0\u201350\u00a0vol% melt), low-\u03b418O Pleistocene granitoid blocks ejected during the \u223c7.7\u00a0ka caldera-forming eruption of Mt. Mazama (Crater Lake, Oregon). The blocks are interpreted to represent wall rocks of the climactic magma chamber that, prior to eruption, experienced variable amounts of exchange with meteoric hydrothermal fluids and subsequent partial melting. U-Th and oxygen isotope results allow us to examine the timescales of hydrothermal circulation and partial melting, and provide an \u201coutside in\u201d perspective on the buildup to the climactic eruption of Mt. Mazama. Oxygen isotope compositions measured in the cores and rims of individual quartz (n\u00a0=\u00a0126) and plagioclase (n\u00a0=\u00a091) crystals, and for transects across ten quartz crystals, document zonation in quartz (\u039418OCore-Rim\u00a0\u2264\u00a00.1\u20135.5\u2030), but show homogeneity in plagioclase (\u039418OCore-Rim\u00a0\u2264\u00a0\u00b10.8\u2030). We propose that oxygen isotope zonation in quartz records hydrothermal exchange followed by high-temperature exchange in response to partial melting caused by injection of basaltic to andesitic recharge magma into the deeper portions of the chamber. Results of modeling of oxygen diffusion in quartz indicates that hydrothermal exchange in quartz occurred over a period of \u223c1000\u201363,000\u00a0years. Models also suggest that the onset of melting of the granitoids occurred a minimum of \u223c10\u2013200\u00a0years prior to the Mazama climactic eruption, an inference which is broadly consistent with results for magnetite homogenization and for Zr diffusion in melt previously reported by others.Uranium-thorium isotope compositions of most granitoid blocks are in\u00a0238U excess, and are in agreement with a\u00a0238U enriched array previously measured for volcanic rocks at Mt. Mazama. Uranium excess in the granitoids is likely due to enrichment via hydrothermal circulation, given their low \u03b418O values. The sample with the highest U excess (\u22655.8%) also has the most\u00a018O isotope depletion (average \u03b418Oplag\u00a0=\u00a0\u22124.0\u2030). The granitoids are a probable assimilant and source of U excess in volcanic rocks from Mt. Mazama. Two granitoids have Th excess and low \u03b418O values, interpreted to record leaching of U during hydrothermal alteration. A U-Th isochron based on the U excess array of the granitoids and volcanic rocks indicates that hydrothermal circulation initiated \u223c40\u201375\u00a0kyrs before the climactic eruption, potentially marking the initiation of a persistent upper-crustal magma chamber. The U-Th ages are consistent with the maximum timescales inferred for hydrothermal alteration based on oxygen isotope zoning in quartz.",
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