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Volatiles in subduction zone magmas: concentrations and fluxes based on melt inclusion and volcanic gas data
Abstract Owing to advances in microanalytical techniques over the last 15 years, there is a growing database on the volatile contents of subduction-related magmas as recorded in melt (glass)Expand
Volatile Abundances in Basaltic Magmas and Their Degassing Paths Tracked by Melt Inclusions
The abundances of CO2, H2O, S and halogens dissolved in basaltic magmas are strongly variable because their solubilities and ability to be fractionated in the vapor phase depend on several parametersExpand
Gradients in H2O, CO2, and exsolved gas in a large-volume silicic magma system: Interpreting the record preserved in melt inclusions from the Bishop Tuff
Infrared spectroscopic analyses of ∼140 melt inclusions in quartz phenocrysts from the zoned Bishop rhyolitic tuff demonstrate that systematic gradients in dissolved magmatic H2O and CO2Expand
Magma degassing buffered by vapor flow through brecciated conduit margins
Obsidian pyroclasts, a common component of rhyolitic tephra, preserve a range of volatile contents, which has been used to infer syneruptive conditions of magmatic degassing. Here we show that theExpand
Why do mafic arc magmas contain ∼4wt% water on average?
Abstract The last 15 yr have seen an explosion of data on the volatile contents of magmas parental to arc volcanoes. This has occurred due to the intense study of melt inclusions trapped in volcanicExpand
Sulfur in basaltic magmas
Abstract The concentration of S in basaltic magmas at 1 atm pressure is strongly dependent on temperature, the fugacities of oxygen ( ƒ O 2 ) and sulfur ( ƒ S 2 ), and bulk composition. MicroprobeExpand
Zoned quartz phenocrysts from the rhyolitic Bishop Tuff
Abstract Cathodoluminescence (CL) reveals growth zones in quartz phenocrysts from the rhyolitic Bishop Tuff. Melt inclusions occur in various zones and record the evolving melt composition duringExpand
Direct measurement of in situ methane quantities in a large gas-hydrate reservoir
Certain gases can combine with water to form solids—gas hydrates—that are stable at high pressures and low temperatures1,2. Conditions appropriate for gas-hydrate formation exist in many marineExpand
Volcanic SO 2 emissions and the abundance and distribution of exsolved gas in magma bodies
The mass of sulfur dioxide (SO 2 ) released by most explosive volcanic eruptions greatly exceeds the amount originally dissolved in the erupted volume of silicate melt. Several lines of evidenceExpand