Fluid-melt partitioning of sulfur in differentiated arc magmas and the sulfur yield of explosive volcanic eruptions

Masotta, Matteo; Keppler, Hans; Chaudhari, Alok Kumar

doi:10.1016/j.gca.2015.12.014

Cited by 48 publications

(37 citation statements)

References 43 publications

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“…Another result of these processes would be the low SO 2 contents determined for the Tongchang MI (Table 5). These SO values are consistent with those of melts from the anhydrite-free, fluid-felsic melt experiments of Masotta et al (2016), and the experimental data are applicable to the MI given the close similarity in bulk composition. For example, the SO 2 contents of anhydrite-free, fluid saturated experimental felsic melts range from 0.005 to 0.03 wt% at 900°C and 0.009 to 0.03 wt% at 800°C and 200 MPa, and in comparison the MI contain 0.01 to 0.03 wt% SO 2 (Masotta et al, 2016).…”

Section: What Do the Compositions Of The Volatile-bearing Phases Reprsupporting

confidence: 85%

Compositions of biotite, amphibole, apatite and silicate melt inclusions from the Tongchang mine, Dexing porphyry deposit, SE China: Implications for the behavior of halogens in mineralized porphyry systems

Bao

Webster

Zhang

et al. 2016

Ore Geology Reviews

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The Dexing deposit, located in the Circum-Pacific ore belt, is the largest porphyry copper deposit in eastern China. It is composed of 3 separate plutons, which host three individual mines (Tongchang, Fujiawu and Zhushahong). The porphyritic granodiorite samples studied in this investigation were collected from the Tongchang ore-forming pluton of this giant deposit. This paper presents electron microprobe analyses of biotite, apatite, amphibole, plagioclase, potassium feldspar and rehomogenized glassy melt inclusions from the Tongchang porphyritic granodiorites. Petrographic observations on these samples show that the portions of granodioritic magma represented by our samples were overprinted by potassic hydrothermal fluid which variably altered these minerals. All of the studied micas are Mg-rich biotite. The biotites are separated into altered magmatic and secondary types based on their petrographic and geochemical characteristics. The phlogopite components of the secondary biotites are typically higher than those of the altered magmatic biotites, and the X Mg values of all biotites correlate negatively with their Cl contents showing that they conform to the Mg-Cl avoidance principle. The X Mg values also correlate negatively with the contents of (K 2 O+Na 2 O+BaO), FeO and TiO 2 for both generations of biotites. The calculated log

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Section: What Do the Compositions Of The Volatile-bearing Phases Reprsupporting

confidence: 85%

Compositions of biotite, amphibole, apatite and silicate melt inclusions from the Tongchang mine, Dexing porphyry deposit, SE China: Implications for the behavior of halogens in mineralized porphyry systems

Bao

Webster

Zhang

et al. 2016

Ore Geology Reviews

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“…Highly oxidized magmas, which may saturate anhydrite early3339, are likely to produce sulfur-poor vapour (or gas) and sulfur-poor eruption clouds (Fig. 4)3140. Increasing the magma CO 2 content from 0.1 to around 1 wt% has the effect of more sulfur partitioning into the gas phase.…”

Section: Resultsmentioning

confidence: 99%

“…3B). A high f O2 may cause the vapour-melt partitioning behaviour of sulfur (as S 6+ ) to be severely damped303140 resulting in a low sulfur mass in the ejected gas cloud (which would have been mostly comprised of water vapour). The high magmatic water content would have yielded a large r value despite the relatively deep magma chamber (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Observing eruptions of gas-rich compressible magmas from space

2016

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Observations of volcanoes from space are a critical component of volcano monitoring, but we lack quantitative integrated models to interpret them. The atmospheric sulfur yields of eruptions are variable and not well correlated with eruption magnitude and for many eruptions the volume of erupted material is much greater than the subsurface volume change inferred from ground displacements. Up to now, these observations have been treated independently, but they are fundamentally linked. If magmas are vapour-saturated before eruption, bubbles cause the magma to become more compressible, resulting in muted ground displacements. The bubbles contain the sulfur-bearing vapour injected into the atmosphere during eruptions. Here we present a model that allows the inferred volume change of the reservoir and the sulfur mass loading to be predicted as a function of reservoir depth and the magma's oxidation state and volatile content, which is consistent with the array of natural data.

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“…Note, for instance, that the Re-ReO 2 buffer is used in experimental petrology for controlling the oxygen fugacity. 12,13 Here, we report angle-dispersive synchrotron X-ray diffraction (XRD) data of the carbon dioxide + gold, platinum, or rhenium systems at pressures up to 48 GPa and temperatures up to 2400 K, using double-sided laser-heating in diamondanvil cells (LHDACs). No evidence of reaction was found in Au and Pt samples in this pressure−temperature range.…”

Section: ■ Introductionmentioning

confidence: 99%

Exploring the Chemical Reactivity between Carbon Dioxide and Three Transition Metals (Au, Pt, and Re) at High-Pressure, High-Temperature Conditions

et al. 2016

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The role of carbon dioxide, CO, as oxidizing agent at high pressures and temperatures is evaluated by studying its chemical reactivity with three transition metals: Au, Pt, and Re. We report systematic X-ray diffraction measurements up to 48 GPa and 2400 K using synchrotron radiation and laser-heating diamond-anvil cells. No evidence of reaction was found in Au and Pt samples in this pressure-temperature range. In the Re + CO system, however, a strongly-driven redox reaction occurs at P > 8 GPa and T > 1500 K, and orthorhombic β-ReO is formed. This rhenium oxide phase is stable at least up to 48 GPa and 2400 K and was recovered at ambient conditions. Raman spectroscopy data confirm graphite as a reaction product. Ab-initio total-energy structural and compressibility data of the β-ReO phase shows an excellent agreement with experiments, altogether accurately confirming CO reduction P-T conditions in the presence of rhenium metal and the β-ReO equation of state.

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Fluid-melt partitioning of sulfur in differentiated arc magmas and the sulfur yield of explosive volcanic eruptions

Cited by 48 publications

References 43 publications

Compositions of biotite, amphibole, apatite and silicate melt inclusions from the Tongchang mine, Dexing porphyry deposit, SE China: Implications for the behavior of halogens in mineralized porphyry systems

Compositions of biotite, amphibole, apatite and silicate melt inclusions from the Tongchang mine, Dexing porphyry deposit, SE China: Implications for the behavior of halogens in mineralized porphyry systems

Observing eruptions of gas-rich compressible magmas from space

Exploring the Chemical Reactivity between Carbon Dioxide and Three Transition Metals (Au, Pt, and Re) at High-Pressure, High-Temperature Conditions

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