Determination of hydrogen content in geological samples using elastic recoil detection analysis (ERDA)

Bureau, Hélène; Raepsaet, Caroline; Khodja, H.; Carraro, Anna; Aubaud, Cyril

doi:10.1016/j.gca.2009.03.009

Cited by 55 publications

(43 citation statements)

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“…This method has been used as a reference for H determination in various materials, including geological samples with a large range of H 2 O concentrations from several wt% to hundreds of ppm in nominally anhydrous minerals (Raepsaet et al 2008;Aubaud et al 2009;Bureau et al 2009;Withers et al 2012). Analyses were conducted at the Nuclear Microprobe of CEA Saclay (Khodja et al 2001) were selected by mapping the major components using Particle Induced X-Ray emission (PIXE) and backscattered helium ions spectroscopy (Rutherford Backscattering, RBS).…”

Section: Analytical Techniquesmentioning

confidence: 99%

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Acosta-Vigil

Barich

Bartoli

et al. 2016

Contrib Mineral Petrol

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The study of the composition of primary melts during anatexis of high-pressure granulitic migmatites is relevant to understand the generation and differentiation of continental crust.Peritectic minerals in migmatites can trap dropless of melt that forms via incongruent melting reactions during crustal anatexis. These melt inclusions commonly crystallize and form nanogranitoids upon slow cooling of the anatectic terrane. To obtain the primary compositions of crustal melts recorded in these nanogranitoids, including volatile concentrations and information on fluid regimes, they must be remelted and rehomogenize before analysis. A new occurrence of nanogranitoids was recently reported in garnets of mylonitic metapelitic gneisses (former high pressure granulitic migmatites) at the bottom of the prograde metamorphic sequence of Jubrique, located on top of the Ronda peridotite slab (Betic Cordillera, S Spain). Nanogranitoids within separated chips of cores and rims of large garnets from these former migmatites were remelted at 15 kbar and 850, 825 or 800 ºC and dry (without added H 2 O), during 24 hours, using a piston cylinder apparatus. Although all experiments show glass (former melt) within melt inclusions, the extent of rehomogenization depends on the experimental temperature. Experiments at 850-825 ºC show abundant disequilibrium microstructures, whereas those at 800 ºC show a relatively high proportion of rehomogenized nanogranitoids, indicating that anatexis and entrapment of melt inclusions in these rocks was likely close to 800 ºC. Electron microprobe and NanoSIMS analyses show that experimental glasses are leucogranitoid and peraluminous, though define two distinct compositional groups. Type I corresponds to K-rich, Ca-and H 2 O-poor leucogranitic melts, whereas type II represents K-poor, Ca-and H 2 O-rich granodioritic to tonalitic melts. Type I and II melt inclusions are found in most cases at the cores and rims of large garnets, respectively. We tentatively suggest that these former migmatites underwent two melting events under contrasting fluid regimes, possibly during two different orogenic periods. This 3 study demonstrates the strong potential of melt inclusions studies in migmatites and granulites in order to unravel their anatectic history, particularly in strongly deformed rocks where most of the classical anatectic microstructures have been erased during deformation.

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Section: Analytical Techniquesmentioning

confidence: 99%

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Acosta-Vigil

Barich

Bartoli

et al. 2016

Contrib Mineral Petrol

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“…A few sanidine crystals are noticeable in the vicinity of the capsule's walls, but these do not hinder the EXAFS analysis as the EXAFS spectra are representative of the sample in the center of the capsule. The water content of the samples was determined by Raman spectroscopy measurements (Losq et al, 2012) and by Elastic Recoil Detection Analysis (ERDA) (Bureau et al, 2009). Raman spectra were acquired at the IMPMC using the 1500 grooves/mm grating of the spectrometer and a 514 nm wavelength laser and are shown on Fig.…”

Section: Samples and Characterization Of Materialsmentioning

confidence: 99%

Bromine speciation in hydrous silicate melts at high pressure

et al. 2015

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International audienceBr speciation in hydrous silicate melts at high pressure has been investigated up to 7.6 GPa using X-ray Absorption Spectroscopy (XAS) at the Br K-edge in a Paris-Edinburgh press. Br in silicate melts is surrounded by an average of 6 Na cations, a number slightly increasing with pressure (5.8 to 6.6), with a Br-Na distance increasing from 3.49 to 3.72 Å. Two oxygens, either from a water, an –OH molecule or from the tetrahedral silicate network, with an average Br-O distance of 1.80 Å, form the closest coordination shell around Br ions. The persistence of an alkali shell around Br, in a structure similar to crystalline NaBr, throughout the pressure range investigated shows that Br can be retained in the melt structure at relatively high pressure and supports the idea of its deep recycling. Finally, our results confirm that Br could be efficiently degassed with water at low pressures and that Br may also have been efficiently degassed along with water during the early stages of an oxidized magma ocean

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“…Indeed, when proton beam depth penetration in minerals can effectively reach up to 62 μm owing to the relatively low stopping power of protons, the gammaray emission from fluorine is induced only in the beginning of the path, as reaction cross-section falls close to zero for energies under 1.5 MeV as attested by a recent measurement reported in Jesus et al (2000). When ERDA is standard less (Raepsaet et al, 2008;Bureau et al, 2009;Withers et al, 2012), the quantification of fluorine requires the use of F-known content samples having a bulk composition similar to the samples (i.e. silicates).…”

Section: Methodsmentioning

confidence: 97%

Is the transition zone a deep reservoir for fluorine?

Roberge

Bureau

Bolfan-Casanova

et al. 2015

Earth and Planetary Science Letters

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International audienceIt is now recognized that the transition zone (TZ) is a significant repository for water. This means that other volatile species may also be stored in this region such as halogen elements. We have measured the solubility of fluorine in wadsleyite (Wd) and ringwoodite (Rw) under hydrous and anhydrous conditions at different pressures and temperatures, relevant for the transition zone. F contents are similar in Wd (665 to 1045 ppm F, up to 956 ppm H2O) and in Rw (186 to 1235 ppm F, up to 1404 ppm H2O). This suggests that F may be incorporated in the same manner as water in the major nominally anhydrous minerals of the TZ: ringwoodite and wadsleyite and that the transition zone could be a major reservoir for fluorine. In the framework of the “water filter model” proposed by Bercovici and Karato (2003), the contrast of volatile element contents between a depleted upper mantle and an enriched transition zone could be maintained over geological time scales. Previous estimates of the fluorine content of the Bulk Silicate Earth (BSE), such as 25 ppm by mass (McDonough and Sun, 1995), have assumed a homogeneous mantle. Although we do not know whether the TZ is F saturated or not, we used our new experimental data and estimates of the lower mantle F content from ocean island basalts to estimate a maximum BSE fluorine content of 59 ppm by mass for a hydrous, F-saturated TZ. This upper bound on the range of possible BSE F content emphasizes the challenges when explaining the origin of volatile elements in the Earth from a carbonaceous chondrite late veneer

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Determination of hydrogen content in geological samples using elastic recoil detection analysis (ERDA)

Cited by 55 publications

References 54 publications

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

The composition of nanogranitoids in migmatites overlying the Ronda peridotites (Betic Cordillera, S Spain): the anatectic history of a polymetamorphic basement

Bromine speciation in hydrous silicate melts at high pressure

Is the transition zone a deep reservoir for fluorine?

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