Modulation of magmatic processes by CO2 flushing

Caricchi, Luca; Sheldrake, Tom; Blundy, Jon

doi:10.1016/j.epsl.2018.03.042

Cited by 110 publications

(85 citation statements)

References 41 publications

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“…Similarly CO 2 -rich melt inclusions have been described from other silicic arc volcanoes (e.g. Blundy et al 2010) and have been attributed to fluxing of melts with magmatic CO 2 -rich fluids by Caricchi et al (2018). For these reasons, we include the high-CO 2 Dominica MIs in our discussion.…”

Section: Water H 2 O Contents Of Morne Diablotins and Mornementioning

confidence: 82%

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: Water H 2 O Contents Of Morne Diablotins and Mornementioning

confidence: 82%

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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“…In addition to perturbing the climate, volcanic CO 2 plays a key role in the storage, ascent and eruption of magma, and drives the stability and evolution of magma reservoirs, regulating flood basalt magmatism and associated degassing fluxes 11,12 . The importance of exsolved volatile phases (e.g., CO 2 -rich fluids) is highlighted by recently developed models of magmatic plumbing systems 13,14 .…”

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confidence: 99%

Deep CO2 in the end-Triassic Central Atlantic Magmatic Province

et al. 2020

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Large Igneous Province eruptions coincide with many major Phanerozoic mass extinctions, suggesting a cause-effect relationship where volcanic degassing triggers global climatic changes. In order to fully understand this relationship, it is necessary to constrain the quantity and type of degassed magmatic volatiles, and to determine the depth of their source and the timing of eruption. Here we present direct evidence of abundant CO 2 in basaltic rocks from the end-Triassic Central Atlantic Magmatic Province (CAMP), through investigation of gas exsolution bubbles preserved by melt inclusions. Our results indicate abundance of CO 2 and a mantle and/or lower-middle crustal origin for at least part of the degassed carbon. The presence of deep carbon is a key control on the emplacement mode of CAMP magmas, favouring rapid eruption pulses (a few centuries each). Our estimates suggest that the amount of CO 2 that each CAMP magmatic pulse injected into the end-Triassic atmosphere is comparable to the amount of anthropogenic emissions projected for the 21 st century. Such large volumes of volcanic CO 2 likely contributed to end-Triassic global warming and ocean acidification.

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“…Over time, the vapor phase thus produced gets progressively more water-rich, thereby reducing the solubility of CO 2 in the remaining melt, as observed in quartz melt inclusions erupted in the Bishop Tuff, for example (Wallace et al 1999). Conversely, underplating mafic magmas producing exsolved CO 2 may "flush" overlying stored magmas (Cashman 2004;Blundy et al 2010;Caricchi et al 2018). In this case, the addition of CO 2 raises the concentration of CO 2 in the coexisting vapor phase, thereby enhancing CO 2 solubility in the silicate melt.…”

Section: Controls On Co 2 Solubility In Silicate Meltsmentioning

confidence: 99%

Magmatic carbon outgassing and uptake of CO2 by alkaline waters

Edmonds

Tutolo

Iacovino

et al. 2020

American Mineralogist

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Much of Earth's carbon resides in the “deep” realms of our planet: sediments, crust, mantle, and core. The interaction of these deep reservoirs of carbon with the surface reservoir (atmosphere and oceans) leads to a habitable surface environment, with an equitable atmospheric composition and comfortable range in temperature that together have allowed life to proliferate. The Earth in Five Reactions project (part of the Deep Carbon Observatory program) identified the most important carbon-bearing reactions of our planet, defined as those which perhaps make our planet unique among those in our Solar System, to highlight and review how the deep and surface carbon cycles connect. Here we review the important reactions that control the concentration of carbon dioxide in our atmosphere: outgassing from magmas during volcanic eruptions and during magmatic activity; and uptake of CO2 by alkaline surface waters. We describe the state of our knowledge about these reactions and their controls, the extent to which we understand the mass budgets of carbon that are mediated by these reactions, and finally, the implications of these reactions for understanding present-day climate change that is driven by anthropogenic emission of CO2.

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Modulation of magmatic processes by CO2 flushing

Cited by 110 publications

References 41 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

Deep CO2 in the end-Triassic Central Atlantic Magmatic Province

Magmatic carbon outgassing and uptake of CO2 by alkaline waters

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