Solubilities of Pt and Rh in a haplobasaltic silicate melt at 1300°C

Ertel, W.; O’Neill, Hugh St. C.; Sylvester, Paul J.; Dingwell, D. B.

doi:10.1016/s0016-7037(99)00136-2

Cited by 142 publications

(151 citation statements)

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“…In this study, we assume a limit of detection of 2 ppb, and samples which return lower apparent values are reported as Ͻ2 ppb (e.g., Table 2 ). The low limit of detection in the present study compares very well with that for Pt and Rh in a previous study (Ertel et al, 1999), in which the effective limit of detection was ϳ200 ppb due to the masking of any lower levels by micronuggets.…”

Section: Laser Ablation-inductively Coupled Plasma-mass Spectrometry supporting

confidence: 88%

“…This was checked against An-Di-eutectic glass samples containing Re that had previously been analysed by conventional sample-nebulization ICP-MS at the Research School of Earth Sciences, Australian National University, also using a Plasma Quad II Plus (see Ertel et al, 1999). Agreement was good, supporting the value of Re in the NIST 612 glass adopted here, although these An-Dieutectic glasses showed somewhat greater inhomogeneity, possibly indicative of the presence of micronuggets.…”

Section: Laser Ablation-inductively Coupled Plasma-mass Spectrometry mentioning

confidence: 64%

“…Although INAA is suitable for quite small samples (e.g., here ϳ100 mg), LA-ICP-MS is a true microanalytical technique, which can resolve inhomogeneities on the scale of the material ablated by one laser pulse, that is, approximately 2 ng of sample (e.g., Ertel et al, 1999). This is important, as it is becoming widely recognised that most, if not all, experimental investigations of highly siderophile element (HSE) partitioning relationships involving silicate melts have been compromised by the presence of colloidal-sized micronuggets of the HSE in the melt.…”

Section: Laser Ablation-inductively Coupled Plasma-mass Spectrometry mentioning

confidence: 99%

“…However, these earlier experimental studies used bulk analytical methods. Some recent parallel studies on other HSEs raise the possibility that these earlier studies may have been compromised by the "micronugget effect" (O'Neill et al, 1995;Ertel et al, 1999), whereby the small amounts of Re chemically dissolved in the silicate melts may have been masked by larger amounts present as micronuggets. Micronuggets are submicroscopic particles, which seem to form something akin to a colloidal suspension.…”

Section: Introductionmentioning

confidence: 99%

“…In an initial series of experiments undertaken to establish the feasibility of the experimental protocol, single samples were taken after sufficient time had elapsed for the Re concentration to reach steady state. A sufficient time was estimated from experience with similar experiments on other siderophile elements (Dingwell et al, 1994;Ertel et al, 1997Ertel et al, , 1999. Obviously, it is somewhat unsatisfactory to rely on previous experience alone in this matter, and therefore, in a second, more detailed set of experiments, samples were taken in a time series at constant fO 2 .…”

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confidence: 99%

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The solubility of rhenium in silicate melts: Implications for the geochemical properties of rhenium at high temperatures

Ertel

O’Neill

Sylvester

et al. 2001

Geochimica et Cosmochimica Acta

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Abstract-The solubility of rhenium (Re) in a haplobasaltic melt (anorthite-diopside eutectic composition) has been experimentally determined using the mechanically assisted equilibration technique at 1400°C as a function of oxygen fugacity (10 Ϫ12 Ͻ fO 2 Յ 10 Ϫ7 bar), imposed by CO-CO 2 gas mixtures. Samples were analysed by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). This is a true microanalytical technique, which allows small-scale sample heterogeneity to be detected, while providing a limit of detection of 2 ppb Re. Time-resolved LA-ICP-MS spectra revealed the presence of suboptically sized micronuggets of Re in all samples, which, because they are present at the 0.5 to 10 ppm level, dominate the true solubilities of Re (Ͻ1 ppm at the conditions of the experiment) in bulk analyses of the samples. Nevertheless, the micronuggets could be filtered out from the time-resolved spectra to reveal accurate values of the true Re solubility. A number of time series of samples were taken at constant fO 2 to demonstrate that the solubilities converge to a constant value. In addition, solubilities were measured after increasing and decreasing the imposed fO 2 . The results show that Re dissolves in the silicate melt as ReO 2 (Re 4ϩ ) and ReO 3 (Re 6ϩ ) species, with the latter predominating at typical terrestrial upper-mantle oxygen fugacities. The total solubility of Re is described by the following expression (fO 2 in bars):[Re/ppb] ϭ 9.7(Ϯ1.9) ϫ 10 9 (fO 2 ) ϩ 4.2 (Ϯ0.3) ϫ 10 14 (fO 2 ) 1.5 Assuming an activity coefficient for Re in Fe-rich metal of 1, this gives a value of D Re met/sil of 5 ϫ 10 10 at log fO 2 ϭ IW-2, appropriate for metal-silicate partitioning in an homogenously accreting Earth. Thus, Re is indeed very highly siderophile, and the mantle's abundance cannot be explained by homogenous accretion.

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Section: Laser Ablation-inductively Coupled Plasma-mass Spectrometry supporting

confidence: 88%

Section: Laser Ablation-inductively Coupled Plasma-mass Spectrometry mentioning

confidence: 64%

Section: Laser Ablation-inductively Coupled Plasma-mass Spectrometry mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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The solubility of rhenium in silicate melts: Implications for the geochemical properties of rhenium at high temperatures

Ertel

O’Neill

Sylvester

et al. 2001

Geochimica et Cosmochimica Acta

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The competing effects of sulfide saturation versus degassing on the behavior of the chalcophile elements during the differentiation of hydrous melts

Jenner

Hauri

Bullock

et al. 2015

Geochem Geophys Geosyst

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There is a lack of consensus regarding the roles of sulfide saturation versus volatile degassing on the partitioning of Cu and Ag during differentiation and eruption of convergent margin magmas. Because of their oxidized character, volatile-rich magmas from the Eastern Manus Back-arc Basin (EMBB) only reach sulfide saturation following magnetite-driven reduction of the melt: the so-called ''magnetite crisis.'' If sulfide saturation typically precedes volatile saturation, the magnetite crisis will limit the proportion of Cu and Ag that can partition from the melt into an exsolving volatile-rich phase, which may contribute to the sporadic occurrence of magmatic-hydrothermal ore deposits at convergent margins. However, it is unclear whether the magnetite crisis is a common or rare event during differentiation of volatile-rich magmas. We report major and trace element data for submarine volcanic glasses from the Tonga arc-proximal Valu Fa Ridge (VFR; SW Pacific). Cu-Se-Ag systematics of samples erupting at the southern VFR suggest magnetite fractionation-triggered sulfide saturation. The similarity in chalcophile element systematics of the southern VFR and EMBB samples is unlikely to be coincidental, and may indicate that the magnetite crisis is a common event during differentiation of hydrous melts. However, unlike many convergent margin magmas, it is unlikely that the evolving VFR and EMBB were saturated in a S-bearing volatile phase prior to magnetite fractionation. Hence, the metal-depleting magnetite crisis may be restricted to back-arc basin magmas that do not degas volatiles prior to magnetite fractionation and potentially convergent margin magmas fractionating at high pressures in the continental crust.

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Metal‐Silicate Partitioning of Siderophile Elements and Core‐Mantle Segregation

Righter¹

2016

Deep Earth

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Solubilities of Pt and Rh in a haplobasaltic silicate melt at 1300°C

Cited by 142 publications

References 14 publications

The solubility of rhenium in silicate melts: Implications for the geochemical properties of rhenium at high temperatures

The solubility of rhenium in silicate melts: Implications for the geochemical properties of rhenium at high temperatures

The competing effects of sulfide saturation versus degassing on the behavior of the chalcophile elements during the differentiation of hydrous melts

Metal‐Silicate Partitioning of Siderophile Elements and Core‐Mantle Segregation

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