Bromine cycle in subduction zones through in situ Br monitoring in diamond anvil cells

Bureau, Hélène; Foy, Eddy; Raepsaet, Caroline; Somogyì, Á.; Munsch, P.; Simon, G.; Kubsky, S.

doi:10.1016/j.gca.2010.04.001

Cited by 44 publications

(34 citation statements)

References 55 publications

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“…137C, 137D; see Table 1; Figure 4D,E,F at Jd-2.5 M). These data indicate that the in situ analyses of both melts and aqueous fluids in the present geometry (Bureau et al 2010) have not been adversely affected, as thought by Borchert et al (2009). D fluid/melt in Cl-bearing systems are consistent with the data by Borchert et al (2009Borchert et al ( , 2010a (Figure 5B,C).…”

Section: Partitioning Behavior Of Rb and Srsupporting

confidence: 87%

“…The incident X-ray energy for all the measurements was 17.5 keV. The sample environmental setup was similar to that used by Bureau et al (2010). A sample in the diamond anvil cell was placed at the focal point of the microbeam.…”

Section: Methodsmentioning

confidence: 99%

“…While aqueous fluids dissolve silicate components under HTHP conditions (Anderson and Burnham 1965;Nakamura and Kushiro 1974), the solutes are not quenched into a single phase and can be recovered as a mixture of glass globules, quench crystals, and other materials (Schneider and Eggler 1986;Keppler 1994;Brenan et al 1995). Such materials quenched from aqueous fluids under HTHP conditions can be analyzed after recovery through various methods including (1) leaching with water (Cullers et al 1970;Flynn and Burnham 1978;Borchert et al 2010a, b), (2) leaching with HCl acid (Keppler and Wyllie 1991;Keppler 1994Keppler , 1996Bai and Koster van Groos 1999), (3) hand-picking (Schneider and Eggler 1986;Ayers and Eggler 1995;Brenan et al 1995), (4) diamond aggregate trap followed by freezing (Kessel et al 2005a), and (5) micro-PIXE (particle induced X-ray emission) analysis of samples quenched in a Bassett-type hydrothermal diamond anvil cell (HDAC; Figure 1A,B; Bassett et al 1993;Bureau et al 2003Bureau et al , 2005Bureau et al , 2007Bureau et al , 2010. Because of the differences in estimating fluid compositions, the reported values of partition coefficients between melts and aqueous fluids have varied to some extent (Ayers and Eggler 1995;Keppler 1996).…”

Section: Introductionmentioning

confidence: 99%

“…In situ analyses of aqueous fluids have been carried out using Bassett-type HDACs either with normal diamond anvils (Sanchez-Valle et al 2003;Bureau et al 2005;Muñoz et al 2005;Bureau et al 2007Bureau et al , 2010 or with modified anvils with a recess (Schmidt and Rickers 2003;Manning et al 2008;Borchert et al 2009Borchert et al , 2010a. For the former, by using transmission geometry ( Figure 1C), Sanchez-Valle et al (2003) obtained Sr concentrations in aqueous fluids coexisting with SrCO 3 crystals under HTHP conditions, and Bureau et al (2007) analyzed both melts and fluids under HTHP conditions and reported the first in situ partition coefficients of Pb between haplogranite melts and aqueous fluids with and without Cl.…”

Section: Introductionmentioning

confidence: 99%

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Large-ion lithophile elements delivered by saline fluids to the sub-arc mantle

et al. 2014

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Geochemical signatures of arc basalts can be explained by addition of aqueous fluids, melts, and/or supercritical fluids from the subducting slab to the sub-arc mantle. Partitioning of large-ion lithophile elements between aqueous fluids and melts is crucial as these two liquid phases are present in the sub-arc pressure-temperature conditions. Using a micro-focused synchrotron X-ray beam, in situ X-ray fluorescence (XRF) spectra were obtained from aqueous fluids and haplogranite or jadeite melts at 0.3 to 1.3 GPa and 730°C to 830°C under varied concentrations of (Na, K)Cl (0 to 25 wt.%). Partition coefficients between the aqueous fluids and melts were calculated for Pb, Rb, and Sr (D values were greater than unity, which is indicative of the capacity of such highly saline fluids to effectively transfer Pb and Rb. Enrichment of large-ion lithophile elements such as Pb and Rb in arc basalts relative to mid-oceanic ridge basalts (MORB) has been attributed to mantle source fertilization by aqueous fluids from dehydrating oceanic plates. Such aqueous fluids are likely to contain Cl, although the amount remains to be quantified.

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Section: Partitioning Behavior Of Rb and Srsupporting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Large-ion lithophile elements delivered by saline fluids to the sub-arc mantle

et al. 2014

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“…The presence of diamonds limits however this technique to the study of elements heavier than Fe, so that thefluorescencesignalisnotabsorbed by the anvils. These studies are also for now limited to moderate pressures (<5GPa).Forinstance, bromine (Br) concentration in melts and aqueous fluids could be measured with this method at P-T conditions relevant of magma generation and ascent in subduction zones (Bureau et al, 2009). The results show that Br has a large affinity for magmas at depth, and that suggests that Br is partly recycled in the mantle rather than being totally extracted from the subducted plates with aqueous fluids upon dehydration and further degassed.…”

Section: Chemical Reactivity/geochemical Affinitymentioning

confidence: 99%

High-pressure experimental geosciences: state of the art and prospects

Sanloup¹

2012

Bulletin De La Société Géologique De France

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International audienceThis paper aims at reviewing the current advancements of high pressure experimental geosciences. The an- gle chosen is that of in situ measurements at the high pressure (P) and high temperature (T) conditions relevant of the deep Earth and planets, measurements that are often carried out at large facilities (X-ray synchrotrons and neutron sources). Rather than giving an exhaustive catalogue, four main active areas of research are chosen: the latest advance- ments on deep Earth mineralogy, how to probe the properties of melts, how to probe Earth dynamics, and chemical reac- tivity induced by increased P-T conditions. For each area, techniques are briefly presented and selected examples illustrate their potentials, and what that tell us about the structure and dynamics of the planet

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Reactive halogens (BrO and OClO) detected in the plume of Soufrière Hills Volcano during an eruption hiatus

Donovan

Tsanev

Oppenheimer

et al. 2014

Geochem Geophys Geosyst

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Volcanic plumes are sites of dynamic chemistry involving halogen gases. Here we present new data on the relative abundances of SO 2 , BrO and OClO gases emitted from Soufriè re Hills Volcano [SHV). They were collected during an eruptive hiatus but during sustained degassing at this halogen-rich volcano. By comparison with data from a previous study during an eruptive phase and application of the data and modeling of Villemant et al. (2008), we suggest that, after consideration of errors, either the rate of HBr conversion to BrO is variable, ranging from 30% to 15%, and/or the relative partitioning of Cl and Br into the gas phase from the melt changes according to eruptive activity. We examine the potential implications of this for fluid-melt partitioning, and compare our results with data from the experimental literature. Our work contributes toward understanding the controls on the BrO/SO 2 ratio for volcano monitoring purposes; the changes in plume chemistry with regard to bromine at the onset of lava extrusion may be large and rapid. OClO was detected in the plume at SHV for the first time. This species has only previously been detected in emissions from Mount Etna (using ground-based methods) and from Puyehue Cordon Caulle (using satellite-based methods). No HCHO or NO y species were detected in the spectra.

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Bromine cycle in subduction zones through in situ Br monitoring in diamond anvil cells

Cited by 44 publications

References 55 publications

Large-ion lithophile elements delivered by saline fluids to the sub-arc mantle

Large-ion lithophile elements delivered by saline fluids to the sub-arc mantle

High-pressure experimental geosciences: state of the art and prospects

Reactive halogens (BrO and OClO) detected in the plume of Soufrière Hills Volcano during an eruption hiatus

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