Remobilization of crustal carbon may dominate volcanic arc emissions.
TLDR
The carbon isotope composition of mean global volcanic gas is considerably heavier, at -3.8 to -4.6 per mil (m) than the canonical mid-ocean ridge basalt value of -6.0 m as discussed by the authors.Abstract:
The flux of carbon into and out of Earth's surface environment has implications for Earth's climate and habitability. We compiled a global data set for carbon and helium isotopes from volcanic arcs and demonstrated that the carbon isotope composition of mean global volcanic gas is considerably heavier, at -3.8 to -4.6 per mil (‰), than the canonical mid-ocean ridge basalt value of -6.0‰. The largest volcanic emitters outgas carbon with higher δ13C and are located in mature continental arcs that have accreted carbonate platforms, indicating that reworking of crustal limestone is an important source of volcanic carbon. The fractional burial of organic carbon is lower than traditionally determined from a global carbon isotope mass balance and may have varied over geological time, modulated by supercontinent formation and breakup.read more
Citations
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Mountains, erosion and the carbon cycle
Robert G. Hilton,A. Joshua West +1 more
TL;DR: In this paper, the authors examined the mechanisms of carbon exchange between rocks and the atmosphere, and discussed the balance of CO2 sources and sinks, and demonstrated that organic carbon burial and oxidative weathering, not widely considered in most models, control the net CO2 budget associated with erosion.
Journal ArticleDOI
Exsolved volatiles in magma reservoirs
Marie Edmonds,Andrew W. Woods +1 more
TL;DR: In this paper, the authors explore the consequences and implications of such a volatile phase for petrogenesis and the fluid dynamics of magma reservoirs, and discuss the accumulation of the exsolved volatile phase at the roof zones of crystal-rich reservoirs for the large gas emissions observed during explosive eruptions, and for the development of metal-rich porphyry deposits.
Journal ArticleDOI
Modulation of magmatic processes by CO2 flushing
TL;DR: In this paper, the authors investigated the effect of gas injection on the stability and chemical evolution of subvolcanic systems and found that CO2 flushing is a widespread process in both felsic and mafic systems.
Journal ArticleDOI
Forearc carbon sink reduces long-term volatile recycling into the mantle
Peter H. Barry,Peter H. Barry,J. M. de Moor,Donato Giovannelli,Matthew O. Schrenk,Daniel R. Hummer,Taryn Lopez,C. A. Pratt,Y. Alpizar Segura,A. Battaglia,P. Beaudry,Giulio Bini,Monserrat Cascante,Giuseppe d’Errico,Giuseppe d’Errico,M. di Carlo,Daniele Fattorini,Katherine M. Fullerton,Esteban Gazel,G. González,Sæmundur A. Halldórsson,Kayla Iacovino,Tehnuka Ilanko,Justin T. Kulongoski,Elena Manini,Michael E. Martinez,Harold C. Miller,Mayuko Nakagawa,Shuhei Ono,Sushmita Patwardhan,Carlos Ramírez,Francesco Regoli,Francesco Smedile,Francesco Smedile,Stephen J. Turner,Costantino Vetriani,Mustafa Yücel,Chris J. Ballentine,Tobias Fischer,David R. Hilton,Karen G. Lloyd +40 more
TL;DR: In the forearc regions of Costa Rica, helium and carbon isotope data reveal that about 20 per cent less carbon is being transported into the deep mantle than previously thought.
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CO 2 flux emissions from the Earth’s most actively degassing volcanoes, 2005–2015
TL;DR: It is proposed that the strong, but yet unmeasured, CO2 emissions from several remote degassing volcanoes worldwide can be predicted using regional/global relationships between the CO2/ST ratio of volcanic gases and whole-rock trace element compositions (e.g., Ba/La).
References
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TL;DR: In this article, the authors describe physical and chemical properties of subduction zone magmatism, including the origin of dual volcanic chains and across-arc geochemical variation, and an experimental assessment of geochemical characteristics.
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