Noble Gases and Volatile Recycling at Subduction Zones

Hilton, David R.; Fischer, Tobias P.; Marty, Bernard

doi:10.2138/rmg.2002.47.9

Cited by 465 publications

(511 citation statements)

References 200 publications

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“…In particular, the carbon-poorer signature of our SC relative to Taran's [2009] IF, in accord with the low CO 2 /SO 2 signature of the KK gases, could be explained by the relative absence of subducted carbonate sediments in the NW Pacific, in comparison to other arc segments [Plank and Langmuir, 1998]. Alternatively, less effective carbon extraction from subducted materials (with respect to the more easily released Cl), and/or carbon-rich sediment accretion/off-scraping [Hilton et al, 2002] might contribute to this discrepancy. Further studies will be needed to resolve this issue.…”

Section: Concluding Remarks: Insights Into Volatile Contents and Origsupporting

confidence: 51%

First volatile inventory for Gorely volcano, Kamchatka

Aiuppa

Giudice

Liuzzo

et al. 2012

Geophysical Research Letters

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We report here the very first assessment of volatile flux emissions from Gorely, an actively degassing volcano in Kamchatka. Using a variety of in situ and remote sensing techniques, we determined the bulk plume concentrations of major volatiles (H2O 93.5%, CO2, 2.6%, SO2 2.2%, HCl 1.1%, HF 0.3%, H2 0.2%) and trace-halogens (Br, I), therefore estimating a total gas release of 11,000 tons·day−1 during September 2011, at which time the target was non-eruptively degassing at 900°C. Gorely is a typical arc emitter, contributing 0.3% and 1.6% of the total global fluxes from arc volcanism for CO2 and HCl, respectively. We show that Gorely's volcanic gas (H2O/SO2 43, CO2/SO2 1.2, HCl/SO2 0.5) is a representative mean end-member for arc magmatism in the north-west Pacific region. On this basis we derive new constraints for the abundances and origins of volatiles in the subduction-modified mantle source which feeds magmatism in Kamchatka

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Section: Concluding Remarks: Insights Into Volatile Contents and Origsupporting

confidence: 51%

First volatile inventory for Gorely volcano, Kamchatka

Aiuppa

Giudice

Liuzzo

et al. 2012

Geophysical Research Letters

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“…Carbon dioxide is abundant in the gases, but its isotopic composition often deviates from the mantle value and the CO 2 is regarded as deriving from subducted sedimentary carbonates and organic carbon as well from the mantle (Sano & Marty 1995;Sano & Williams 1996;Shaw et al 2003Shaw et al ,2004. The total flux of CO 2 from arc volcanism is approximately 1.6 Tmol yr K1 (Hilton et al 2002). Of this, approximately 13% is from the mantle (Shaw et al 2003), yielding an arc-volcanic component of J am of 0.2 Tmol C yr K1 .…”

Section: Inputs Of Mantle Carbonmentioning

confidence: 99%

“…For the volatile outputs from arcs, the most complete budget has been compiled by Hilton et al (2002), who considered subduction inputs to and volatile emissions from 26 arc systems worldwide. The authors calculated a global volcanic arc CO 2 flux of 1.6 Tmol C yr K1 and emphasized the importance of distinguishing between sources of volatiles.…”

Section: Carbon Cycling At Subduction Zonesmentioning

confidence: 99%

“…The other component of J av is j sCO 2 , emission of CO 2 from seeps, especially in fore-arc and back-arc regions. This flux is unconstrained, and may be as large as j vCO 2 (Hilton et al 2002). Ingebritsen & Manning (2002) have pointed to diffuse fluid flow through tectonically active crust as potentially a major flux of subduction-derived volatiles.…”

Section: Carbon Cycling At Subduction Zonesmentioning

confidence: 99%

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The carbon cycle and associated redox processes through time

Hayes

Waldbauer

2006

Phil. Trans. R. Soc. B

428

308

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Earth's biogeochemical cycle of carbon delivers both limestones and organic materials to the crust. In numerous, biologically catalysed redox reactions, hydrogen, sulphur, iron, and oxygen serve prominently as electron donors and acceptors. The progress of these reactions can be reconstructed from records of variations in the abundance of 13 C in sedimentary carbonate minerals and organic materials. Because the crust is always receiving new CO 2 from the mantle and a portion of it is being reduced by photoautotrophs, the carbon cycle has continuously released oxidizing power. Most of it is represented by Fe 3C that has accumulated in the crust or been returned to the mantle via subduction. Less than 3% of the estimated, integrated production of oxidizing power since 3.8 Gyr ago is represented by O 2 in the atmosphere and dissolved in seawater. The balance is represented by sulphate. The accumulation of oxidizing power can be estimated from budgets summarizing inputs of mantle carbon and rates of organic-carbon burial, but levels of O 2 are only weakly and indirectly coupled to those phenomena and thus to carbon-isotopic records. Elevated abundances of 13 C in carbonate minerals ca 2.3 Gyr old, in particular, are here interpreted as indicating the importance of methanogenic bacteria in sediments rather than increased burial of organic carbon.

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“…The R/Ra values of gases released along convergent plate boundaries may vary between 3 and 8, depending on the degree of crustal contamination affecting the mantle source (Poreda and Craig, 1989;Hilton et al, 2002). The Rc/Ra values measured in the GGP gases (Table 1) fall within such range ( Table 1).…”

Section: Discussion Gas Sources and Secondary Chemical-physical Procementioning

confidence: 89%

The Geothermal Resource in the Guanacaste Region (Costa Rica): New Hints From the Geochemistry of Naturally Discharging Fluids

et al. 2018

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The Guanacaste Geothermal Province (GGP) encompasses the three major volcanoes of northern Costa Rica, namely from NW to SE: Rincón de la Vieja, Miravalles, and Tenorio. The dominant occurrence of (i) SO 4 -rich acidic fluids at Rincón de la Vieja, (ii) Cl-rich mature fluids at Miravalles, and (iii) HCO − 3 -rich and low-temperature fluids at Tenorio was previously interpreted as due to a north-to-south general flow of thermal waters and a magmatic gas upwelling mostly centered at Rincón de la Vieja, whereas Miravalles volcano was regarded as fed by a typical geothermal reservoir consisting of a highly saline Na-Cl aquifer. The uniformity in chemical and isotopic (R/Ra and δ 34 S) compositions of the neutral Cl-rich waters suggested to state that all the thermal discharges in the GGP are linked at depth to a single, regional geothermal system. In this scenario, the thermal manifestations related to Tenorio volcano were regarded as a distal and diluted fluid outflow. In this study, a new gas geochemical dataset, including both chemical and isotopic (δ 13 C-CO 2 and R/Ra) parameters of fluid discharges from the three volcanoes, is presented and discussed. Particular attention was devoted to the Tenorio thermal manifestations, since they were poorly studied in the past because this area has been considered of low geothermal potential. The aim is to provide insights into the magmatic-hydrothermal fluid circulation and to verify the spatial distribution of the heat fluid source feeding the fluid manifestations. According to this new dataset, CO 2 , i.e., the most abundant dry gas in the fluid manifestations, is mostly produced by limestone, whereas the mantle CO 2 contribution is ≤3.3%. Strongly acidic gas compounds from magma degassing were absent in the discharged fluids, being scrubbed by secondary processes related to prolonged fluid-rock interactions and mixing with shallow aquifers. Our results only partially confirm the previously depicted model, because the geochemical and isotopic features (e.g., relatively high concentrations of temperature-dependent gases and high R/Ra values) shown by fluids seeping out from the southern sector of Tenorio volcano are more representative of medium-to-high enthalpy volcanic systems than those typically occurring in distal areas. This implies that the geothermal potential in the south of the GGP is higher than previously thought.

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Noble Gases and Volatile Recycling at Subduction Zones

Cited by 465 publications

References 200 publications

First volatile inventory for Gorely volcano, Kamchatka

First volatile inventory for Gorely volcano, Kamchatka

The carbon cycle and associated redox processes through time

The Geothermal Resource in the Guanacaste Region (Costa Rica): New Hints From the Geochemistry of Naturally Discharging Fluids

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