Zr complexation in high pressure fluids and silicate melts and implications for the mobilization of HFSE in subduction zones

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

doi:10.1016/j.gca.2012.11.001

Cited by 74 publications

(57 citation statements)

References 100 publications

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“…However, enhanced solubility could just as easily be ascribed to Na-zirconate complexing. Nazirconate type of complexing is consistent with the available XANES data (Louvel et al 2013). It is also consistent with the Raman spectra of solutions and crystalline Na-zirconate discussed above (Fig.…”

Section: Discussionsupporting

confidence: 91%

“…An Si-OH linkage could, nevertheless, exist as a part a zirconosilicate complex in the fluid. This latter suggestion would be consistent with the EXAFS-and XANES-based structural interpretation of fluids in alkali silicate zirconate environments (Wilke et al 2012, Louvel et al 2013.…”

Section: Discussionsupporting

confidence: 83%

“…This structural interpretation also is consistent with published XANES and EXAFS (Extended X-ray Absorption Fine Structure) spectra of Zr-bearing Na-silicate aqueous fluids, where structures resembling zirconosilicates were proposed (Wilke et al 2012, Louvel et al 2013. Alkali zirconosilicate complexing also has been suggested for hydrous, peralkaline aluminosilicate melts (Watson 1979 …”

Section: Raman Spectroscopysupporting

confidence: 88%

“…The latter observations have led to suggestions that complexing of HFSEs with major-element solutes in aqueous fluids would greatly enhance the HFSE solubility. Scattered solubility data of some HFSEs in water-rich multi-component fluids at high temperature and pressure are consistent with such ideas (Ayers and Watson 1993, Antignano and Manning 2008, Mysen 2012, Ayers et al 2012, Louvel et al 2013. Effects of major element composition on HFSE solubility in silicate melts have also been reported (Watson 1976, 1979, Ellison and Hess 1986, Linnen and Keppler 2002.…”

supporting

confidence: 69%

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An in situ experimental study of Zr4+ transport capacity of water-rich fluids in the temperature and pressure range of the deep crust and upper mantle

Mysen

2015

Prog. in Earth and Planet. Sci.

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An in situ experimental study of Zr 4+ transport capacity of water-rich fluids in the temperature and pressure range of the deep crust and upper mantle Bjorn MysenAbstract Throughout the Earth's history, mass transport involved fluids. In order to address the circumstances under which Zr 4+ may have been transported in this manner, its solubility behavior in aqueous fluid with and without NaOH and SiO 2 in equilibrium with crystalline ZrO 2 was determined from 550 to 950°C and 60 to 1200 MPa. The measurements were carried out in situ while the samples were at the temperatures and pressures of interest. In ZrO 2 -H 2 O and ZrO 2 -SiO 2 -H 2 O fluids, the Zr 4+ concentration ranges from ≤10 to~70 ppm with increasing temperature and pressure. Addition of SiO 2 to the ZrO 2 -H 2 O system does not affect these values appreciably. In these two environments, Zr 4+ forms simple oxide complexes in the H 2 O fluid with ΔH~40 kJ/mol for the solution equilibrium, ZrO 2 (solid) = ZrO 2 (fluid). The Zr 4+ concentration in aqueous fluid increases about an order of magnitude upon addition of 1 M NaOH, which reflects the formation of zirconate complexes. The principal solution mechanism is ZrO 2 + 4NaOH = Na 4 ZrO 4 + 2H 2 O with ΔH~200 kJ/mol. Addition of both SiO 2 and NaOH to ZrO 2 -H 2 O enhances the Zr 4+ by an additional factor of about 5 with the formation of partially protonated alkali zircon silicate complexes in the fluid. The principal solution mechanism is 2ZrO 2 + 2NaOH + 2SiO 2 = Na 2 Zr 2 Si 2 O 9 + H 2 O with ΔH~40 kJ/mol. These results, in combination with other published experimental data, imply that fluid released during high-temperature/high-pressure dehydration of hydrous mineral assemblages in the Earth's interior under some circumstances may carry significant concentrations of Zr and probably other high field strength elements (HFSEs). This suggestion is consistent with the occurrence of Zr-rich veins in high-grade metamorphic eclogite and granulite terranes. Moreover, aqueous fluids transported from dehydrating oceanic crust into overlying mantle source rocks of partial melting also may carry high-abundance HFSE of fluids released from dehydrating slabs and transported to the source rock of partial melting in the overlying mantle wedge. These processes may have been operational in the Earth's history within which subduction resembling that observed today was operational.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 83%

Section: Raman Spectroscopysupporting

confidence: 88%

supporting

confidence: 69%

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An in situ experimental study of Zr4+ transport capacity of water-rich fluids in the temperature and pressure range of the deep crust and upper mantle

Mysen

2015

Prog. in Earth and Planet. Sci.

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“…An important question for hydrothermal transport is the speciation of metals in hydrothermal fluids and X-ray absorption spectroscopy (XANES and EXAFS) is often used to investigate this. Recently, X-ray absorption spectroscopy has been coupled to an HDAC to study Zr complexation in hydrothermal fluids (Louvel et al, 2013). Wu et al (1995) used the HDAC along with synchrotron XRD to determine the thermal expansion of calcite to 500 °C and 10 kbar.…”

Section: History -The Development Of Ideas About Crustal Fluid Composmentioning

confidence: 99%

Fluids in the Continental Crust

Yardley¹,

Bodnar²

2014

GeochemPersp

229

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The crust‐mantle interaction in continental subduction channels: Zircon evidence from orogenic peridotite in the Sulu orogen

Chen

Zheng

et al. 2016

JGR Solid Earth

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A combined secondary ion mass spectrometer and laser ablation‐(multicollector)‐inductively coupled plasma mass spectrometer study of zircon U‐Pb ages, trace elements, and O and Hf isotopes was carried out for orogenic peridotite and its host gneiss in the Sulu orogen. Newly grown zircon domains exhibit weak zoning or no zoning, relatively low Th/U ratios (<0.1), low heavy rare earth element (HREE) contents, steep middle rare earth element‐HREE patterns, negative Eu anomalies, and negative to low δ18O values of −11.3 to 0.9‰ and U‐Pb ages of 220 ± 2 to 231 ± 4 Ma. Thus, these zircons would have grown from metasomatic fluids during the early exhumation of deeply subducted continental crust. The infiltration of metasomatic fluids into the peridotite is also indicated by the occurrence of hydrous minerals such as amphibole, serpentine, and chlorite. In contrast, relict zircon domains exhibit magmatic zircon characteristics. Their U‐Pb ages and trace element and Hf‐O isotope compositions are similar to those for protolith zircons from ultrahigh‐pressure metamorphic rocks in the Dabie‐Sulu orogenic belt. Thus, these relict magmatic zircons would be physically transported into the peridotite by metasomatic fluids originated from the deeply subducted continental crust. Therefore, the peridotite underwent metasomatism by aqueous solutions derived from dehydration of the deeply subducted continental crust during the early exhumation. It is these crustally derived fluids that would have brought not only such chemical components as Zr and Si but also tiny zircon grains from the deeply subducted crustal rocks into the peridotite at the slab‐mantle interface in continental subduction channels. As such, the orogenic peridotite records the crust‐mantle interaction at the deep continental subduction zone.

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Zr complexation in high pressure fluids and silicate melts and implications for the mobilization of HFSE in subduction zones

Cited by 74 publications

References 100 publications

An in situ experimental study of Zr4+ transport capacity of water-rich fluids in the temperature and pressure range of the deep crust and upper mantle

An in situ experimental study of Zr4+ transport capacity of water-rich fluids in the temperature and pressure range of the deep crust and upper mantle

Fluids in the Continental Crust

The crust‐mantle interaction in continental subduction channels: Zircon evidence from orogenic peridotite in the Sulu orogen

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