Constraints on the mobilization of Zr in magmatic-hydrothermal processes in subduction zones from in situ fluid-melt partitioning experiments

Louvel, Marion; Sanchez-Valle, Carmen; Malfait, Wim J.; Cardon, Hervé; Testemale, Denis; Hazemann, Jean‐Louis

doi:10.2138/am.2014.4799

Cited by 29 publications

(21 citation statements)

References 80 publications

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“…This took ~30-40 min at each unique pressure-temperature point. The time to reach steady state is consistent with observations reported by Sanchez-Valle et al (2003), Schmidt et al (2007), Manning et al (2008), and Louvel et al (2014). Once steady-state conditions were achieved, spectra were collected in 300 s intervals for ~3 h. The temperature was then increased to 400 °C, and subsequently to 500 °C, and the data collection procedure was repeated at each temperature ( Fig.…”

Section: Sxrf Experimentssupporting

confidence: 82%

“…incoming beam. Peak intensities were corrected for absorption in the by fluid using the fluid composition and density, following the procedure described in SanchezValle et al (2003), Schmidt et al (2007), Manning et al (2008), and Louvel et al (2014). A linear background was subtracted and the area of the Nb fluorescence peak was fit and integrated by using the program Fityk (Wojdyr 2010).…”

Section: Sxrf Experimentsmentioning

confidence: 99%

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The mobility of Nb in rutile-saturated NaCl- and NaF-bearing aqueous fluids from 1–6.5 GPa and 300–800 °C

Tanis

Simon

Tschauner

et al. 2015

American Mineralogist

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Rutile (TiO 2 ) is an important host phase for high field strength elements (HFSE) such as Nb in metamorphic and subduction zone environments. The observed depletion of Nb in arc rocks is often explained by the hypothesis that rutile sequesters HFSE in the subducted slab and overlying sediment, and is chemically inert with respect to aqueous fluids evolved during prograde metamorphism in the forearc to subarc environment. However, field observations of exhumed terranes, and experimental studies, indicate that HFSE may be soluble in complex aqueous fluids at high pressure (i.e., >0.5 GPa) and moderate to high temperature (i.e., >300 °C). In this study, we investigated experimentally the mobility of Nb in NaCl-and NaF-bearing aqueous fluids in equilibrium with Nb-bearing rutile at pressure-temperature conditions applicable to fluid evolution in arc environments. Niobium concentrations in aqueous fluid at rutile saturation were measured directly by using a hydrothermal diamondanvil cell (HDAC) and synchrotron X-ray fluorescence (SXRF) at 2.1 to 6.5 GPa and 300-500 °C, and indirectly by performing mass loss experiments in a piston-cylinder (PC) apparatus at ~1 GPa and 700-800 °C. The concentration of Nb in a 10 wt% NaCl aqueous fluid increases from 6 to 11 μg/g as temperature increases from 300 to 500 °C, over a pressure range from 2.1 to 2.8 GPa, consistent with a positive temperature dependence. The concentration of Nb in a 20 wt% NaCl aqueous fluid varies from 55 to 150 μg/g at 300 to 500 °C, over a pressure range from 1.8 to 6.4 GPa; however, there is no discernible temperature or pressure dependence. The Nb concentration in a 4 wt% NaF-bearing aqueous fluid increases from 180 to 910 μg/g as temperature increases from 300 to 500 °C over the pressure range 2.1 to 6.5 GPa. The data for the F-bearing fluid indicate that the Nb content of the fluid exhibits a dependence on temperature between 300 and 500 °C at ≥2 GPa, but there is no observed dependence on pressure. Together, the data demonstrate that the hydrothermal mobility of Nb is strongly controlled by the composition of the fluid, consistent with published data for Ti. At all experimental conditions, however, the concentration of Nb in the fluid is always lower than coexisting rutile, consistent with a role for rutile in moderating the Nb budget of arc rocks.

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Section: Sxrf Experimentssupporting

confidence: 82%

Section: Sxrf Experimentsmentioning

confidence: 99%

The mobility of Nb in rutile-saturated NaCl- and NaF-bearing aqueous fluids from 1–6.5 GPa and 300–800 °C

Tanis

Simon

Tschauner

et al. 2015

American Mineralogist

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“…However, aqueous solutions usually carry much less HREE and HFSE than hydrous melts (Hermann et al ., ; Zheng et al ., ). Previous studies indicate that the solubility of HFSE in metamorphic fluids is highly dependent on the fluid composition, especially the contents of Na–Al–Si silicates and halogens like F and Cl (Antignano & Manning, ; Manning et al ., ; Rapp et al ., ; Zaraisky et al ., ; Wilke et al ., ; Louvel et al ., , ; Tanis et al ., ). These experimental results suggest that significant contents of alkali‐aluminosilicates, F and Cl in metamorphic fluids can greatly promote the solubility of HFSE.…”

Section: Trace Element Behaviour During Growth Of Polygenetic Titanitementioning

confidence: 97%

Polygenetic titanite records the composition of metamorphic fluids during the exhumation of ultrahigh‐pressure metagranite in the Sulu orogen

Chen

Zhou

Zheng

et al. 2016

Journal Metamorphic Geology

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An integrated study of U-Pb ages and trace elements was carried out for titanite and zircon from ultrahigh-pressure (UHP) metagranites in the Sulu orogen, east-central China. The results provide constraints on the composition of metamorphic fluids during the exhumation of deeply subducted continental crust. Titanite has two domain types based on REE patterns and trace element variations, Ttn-I and Ttn-II respectively. These two domains show indistinguishable U-Pb ages of 232 AE 14 to 220 AE 8 Ma, in general agreement with anatectic zircon U-Pb ages of 223 AE 4 to 219 AE 2 Ma for the partial melting event during early exhumation. The Ttn-I domains have significantly higher REE, Th, Ta and Sr, and higher Th/U ratios than the Ttn-II domains, indicating that the two domains have grown from metamorphic fluids with different compositions. For the Ttn-I domains, Zr-in-titanite thermometry yields high temperatures of 773-851°C at 2.5 GPa, and petrographic observations reveal the presence of melt pseudomorphs. Thus, they are interpreted to have grown from hydrous melts in the early exhumation stage. In contrast, the Ttn-II domains were texturally equilibrated with amphibolite facies minerals such as biotite and plagioclase and contain inclusions of plagioclase and quartz. The Zr-in-titanite thermometry yields lower temperatures of 627-685°C at 1.0 GPa. In combination with their REE patterns, they are interpreted to have grown from aqueous solutions at amphibolite facies metamorphic conditions during further exhumation. The differences in Th and Sr contents are prominent between the Ttn-I and Ttn-II domains, signifying the compositional difference between the hydrous melts and aqueous solutions. Therefore, the polygenetic titanite in the UHP metamorphic rocks provides insights into the geochemical property of metamorphic fluids during the continental subduction-zone processes.

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“…All experiments were conducted in Bassett-type hydrothermal diamond-anvil cells (HDAC, Bassett et al, 1993) widely used for in-situ X-ray fluorescence (SXRF) and absorption (XAS) measurements on aqueous fluids and silicate melts up to 1000 °C and about 3 GPa (e.g. Borchert et al, 2009;Louvel et al, 2013Louvel et al, , 2014. The HDACs were mounted with a thinner diamond (1.2 mm thick) on the detector side to reduce the X-ray path through the diamonds and widen the collection angle of the XAS analysis (Sanchez-Valle et al, 2004).…”

Section: Hydrothermal Diamond Anvil Cell Experimentsmentioning

confidence: 99%

“…The intensity of the incident beam was monitored throughout the experiments using an Ar-filled micro-ion-chamber placed between the Kirkpatrick-Baez mirrors and the HDAC. Before measurements, temperature was stabilized for about 30 min after each heating stage to ensure that chemical equilibrium was achieved inside the cell (Louvel et al, 2014). In the case of coexisiting melts and fluid, careful attention was paid that measurements were performed when the melt globule was stationary and bridging both diamonds (Fig.…”

Section: In-situ Sxrf/xas Measurements and Data Analysismentioning

confidence: 99%

Bromine speciation and partitioning in slab-derived fluids and melts: Implications for halogens recycling in subduction zones

Louvel

Sanchez-Valle

Malfait

et al. 2020

Preprint

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Abstract. Understanding the behavior of halogens (Cl, Br, and I) in subduction zones is critical to constrain the recycling of trace elements and metals, and to quantify the halogen fluxes to the atmosphere via volcanic degassing. Here, the partitioning of bromine between coexisting aqueous fluids and hydrous granitic melts and its speciation in slab-derived fluids have been investigated in situ up to 840 °C and 2.2 GPa by X-ray fluorescence (SXRF) and absorption (XANES and EXAFS) spectroscopy in hydrothermal diamond-anvil cells. The partition coefficients Df/mBr range from 15.3 ± 1.0 to 2.0 ± 0.1, indicating the preferential uptake of Br by aqueous fluids at all investigated conditions. EXAFS analysis further evidences a gradual evolution of Br speciation from hydrated Br ions [Br(H2O)6]− in slab dehydration fluids to more complex structures invoving both Na ions and water molecules, [BrNax(H2O)y], in hydrous silicate melts and supercritical fluids released at greather depth (> 200 km). In dense fluids containing 60 wt % dissolved alkali-silicates and in hydrous Na2Si2O5 melts (10 wt % H2O), Br is found in a salt-like structure involving 6 nearest Na ions and several next-nearest O neighbors that are either from water molecules or the tetrahedral silicate network. Bromine (and likely chlorine and iodine) complexation with alkalis is thus an efficient mechanism for the mobilization and transport of halogens by hydrous silicate melts and supercritical fluids, which can carry high amounts of Br, up to the 1000 ppm level. Overall, our results suggest that both shallow dehydration fluids and deeper silicate-bearing fluids efficiently remove halogens from the slab in the sub-arc region, thus controling an efficient recycling of halogens in subduction zones.

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Constraints on the mobilization of Zr in magmatic-hydrothermal processes in subduction zones from in situ fluid-melt partitioning experiments

Abstract: International audienc

Cited by 29 publications

References 80 publications

The mobility of Nb in rutile-saturated NaCl- and NaF-bearing aqueous fluids from 1–6.5 GPa and 300–800 °C

The mobility of Nb in rutile-saturated NaCl- and NaF-bearing aqueous fluids from 1–6.5 GPa and 300–800 °C

Polygenetic titanite records the composition of metamorphic fluids during the exhumation of ultrahigh‐pressure metagranite in the Sulu orogen

Bromine speciation and partitioning in slab-derived fluids and melts: Implications for halogens recycling in subduction zones

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