Halogens in Mafic and Intermediate-Silica Content Magmas

Webster, James D.; Baker, Don R.; Aiuppa, Alessandro

doi:10.1007/978-3-319-61667-4_6

Cited by 52 publications

(36 citation statements)

References 490 publications

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“…Pl-hosted MI show the highest Cl content, up to 4428 ppm. These Cl contents lie at the high end of the values for silicic melts reported by Webster et al (2018) in their global compilation. Chlorine and fluorine contents are well correlated for the entire dataset (Fig.…”

Section: Halogens: Fluorine In Morne Diablotins and Mornementioning

confidence: 63%

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Deep pre-eruptive storage of silicic magmas feeding Plinian and dome-forming eruptions of central and northern Dominica (Lesser Antilles) inferred from volatile contents of melt inclusions

Balcone-Boissard

Boudon

Blundy

et al. 2018

Contrib Mineral Petrol

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Volatiles contribute to magma ascent through the sub-volcanic plumbing system. Here, we investigate melt inclusion compositions in terms of major and trace elements, as well as volatiles (H 2 O, CO 2 , SO 2 , F, Cl, Br, S) for Quaternary Plinian and dome-forming dacite and andesite eruptions in the central and the northern part of Dominica (Lesser Antilles arc). Melt inclusions, hosted in orthopyroxene, clinopyroxene and plagioclase are consistently rhyolitic. Post-entrapment crystallisation effects are limited, and negligible in orthopyroxene-hosted inclusions. Melt inclusions are among the most water-rich yet recorded (≤ 8 wt% H 2 O). CO 2 contents are generally low (< 650 ppm), although in general the highest pressure melt inclusion contain the highest CO 2. Some low-pressure (< 3 kbars) inclusions have elevated CO 2 (up to 1100-1150 ppm), suggestive of fluxing of shallow magmas with CO 2-rich fluids. CO 2-trace element systematics indicate that melts were volatile-saturated at the time of entrapment and can be used for volatile-saturation barometry. The calculated pressure range (0.8-7.5 kbars) indicates that magmas originate from a vertically-extensive (3-27 km depth) storage zone within the crust that may extend to the sub-Dominica Moho (28 km). The vertically-extensive crustal system is consistent with mush models for sub-volcanic arc crust wherein mantle-derived mafic magmas undergo differentiation over a range of crustal depths. The other volatile range of composition for melt inclusions from the central part is F (75-557 ppm), Cl (1525-3137 ppm), Br (6.1-15.4 ppm) and SO 2 (< 140 ppm), and for the northern part it's F (92-798 ppm), Cl (1506-4428 ppm), Br (not determined) and SO 2 (< 569; one value at 1015 ppm). All MIs, regardless of provenance, describe the same Cl/F correlation (8.3 ± 2.7), indicating that the magma source at depth is similar. The high H 2 O content of Dominica magmas has implications for hazard assessment.

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Section: Halogens: Fluorine In Morne Diablotins and Mornementioning

confidence: 63%

“…10f). Like Cl, the Br concentrations lie at the high end of the global range in silicic magmas reported by Webster et al (2018).…”

Section: Halogens: Fluorine In Morne Diablotins and Mornementioning

confidence: 85%

Deep pre-eruptive storage of silicic magmas feeding Plinian and dome-forming eruptions of central and northern Dominica (Lesser Antilles) inferred from volatile contents of melt inclusions

Balcone-Boissard

Boudon

Blundy

et al. 2018

Contrib Mineral Petrol

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“…Previous reviews on volcanic halogens have focused on petrological approaches (e.g., Devine et al, 1984;Wallace, 2005) and volcanic degassing fluxes of halogens (Pyle and Mather, 2009) or their general cycling and distribution in the earth system (Webster et al, 2018). Platt and Bobrowski (2015) summarized observations of reactive bromine species mainly by spectroscopic technologies.…”

Section: Introductionmentioning

confidence: 99%

Advances in Bromine Speciation in Volcanic Plumes

et al. 2018

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“…Among these major volatiles, the halogens chlorine and fluorine are the most poorly understood [e.g. Aiuppa et al 2009;Webster et al 2018]. Their release from ascending magma is not a simple consequence of decompression, and conditions of magma emplacement are important in controlling if and how they become mobile [Kilinc and Burnham 1972;Villemant and Boudon 1999;Edmonds et al 2002].…”

Section: Halogens In Volcanic Systemsmentioning

confidence: 99%

Halogen (Cl, F) release during explosive, effusive, and intrusive phases of the 2011 rhyolitic eruption at Cordón Caulle volcano (Chile)

Schipper

Castro²,

Kennedy

et al. 2019

Volcanica

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We investigate sulphur, chlorine and fluorine release during explosive, effusive and intrusive phases the 2011-2012 Cordón Caulle eruption, with a focus on the halogens. Analysis of melt inclusions, pyroclasts and lava samples shows most sulphur to have degassed during magma decompression, but halogen release to have accompanied isobaric crystallisation in slowly-cooled magma that was emplaced in a lava flow and sub-vent intrusion. Fluorine in particular mobilised only after extensive groundmass crystallisation and incipient devitrification. By 2017, gas emitted from vent-proximal fumaroles had hydrothermal compositions, with HCl/HF ratios correlating with temperature. We estimate that the eruption could eventually emit up to 0.92 Mt of SO 2 , 6.3 Mt of HCl, and 1.9 Mt of HF, but only ∼16 wt.%, ∼7 wt.% and ∼2 wt.% of these were respectively emitted during opening explosive phases. Halogen devolatilisation and its associated hazards can persist long after rhyolite eruption and/or emplacement.

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Halogens in Mafic and Intermediate-Silica Content Magmas

Cited by 52 publications

References 490 publications

Deep pre-eruptive storage of silicic magmas feeding Plinian and dome-forming eruptions of central and northern Dominica (Lesser Antilles) inferred from volatile contents of melt inclusions

Deep pre-eruptive storage of silicic magmas feeding Plinian and dome-forming eruptions of central and northern Dominica (Lesser Antilles) inferred from volatile contents of melt inclusions

Advances in Bromine Speciation in Volcanic Plumes

Halogen (Cl, F) release during explosive, effusive, and intrusive phases of the 2011 rhyolitic eruption at Cordón Caulle volcano (Chile)

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