Precise determination of PGE in a GSJ reference sample JP-1 by ID-ICPMS after nickel sulfide fire assay preconcentration

Shirai, Naoki; Nishino, Tomoe; Li, Xiaolin; Amakawa, Hiroshi; Ebihara, Mitsuru

doi:10.2343/geochemj.37.531

Cited by 28 publications

(18 citation statements)

References 26 publications

(32 reference statements)

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“…Approximately 10 mg of the powder was used for determining REEs, whereas about 200 mg sample was used for PGE in consideration of the heterogeneity of PGE. These analytical procedures were described in Latif et al (1999), Shirai et al (2003), Shinotuska and Ebihara (1997), and for PGA, INAA, ICP-MS of REE, and ICP-MS of PGE, respectively.…”

Section: Samples and Analytical Techniquesmentioning

confidence: 99%

An anomalous eucrite, Dhofar 007, and a possible genetic relationship with mesosiderites

Yamaguchi

Setoyanagi

Ebihara

2006

Meteoritics &Amp; Planetary Science

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Abstract-We studied the texture, mineralogy, and bulk chemical composition of Dhofar 007, a basaltic achondrite. Dhofar 007 is a polymict breccia that is mostly composed of coarse-grained granular (CG) clasts with a minor amount of xenolithic components, such as a fragment of Mg-rich pyroxene. The coarse-grained, relict gabbroic texture, mineral chemistry, and bulk chemical data of the coarse-grained clast indicate that the CG clasts were originally a cumulate rock crystallized in a crust of the parent body. However, in contrast to monomict eucrites, the siderophile elements are highly enriched and could have been introduced by impact events. Dhofar 007 appears to have experienced a two-stage postcrystallization thermal history: rapid cooling at high temperatures and slow cooling at lower temperatures. The presence of pigeonite with closely spaced, fine augite lamellae suggests that this rock was cooled rapidly from higher temperatures (>0.5 °C/yr at ∼1000 °C) than typical cumulate eucrites. However, the presence of the cloudy zone in taenite and the Ni profile across the kamacite-taenite boundaries indicates that the cooling rate was very slow at lower temperatures (∼1-10 °C/Myr at <600-700 °C). The slow cooling rate is comparable to those in mesosiderites and pallasites. The two-stage thermal history and the relative abundance of siderophile elements similar to those for metallic portions in mesosiderites suggest that Dhofar 007 is a large inclusion of mesosiderite. However, we cannot rule out a possibility that Dhofar 007 is an anomalous eucrite.

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Section: Samples and Analytical Techniquesmentioning

confidence: 99%

An anomalous eucrite, Dhofar 007, and a possible genetic relationship with mesosiderites

Yamaguchi

Setoyanagi

Ebihara

2006

Meteoritics &Amp; Planetary Science

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“…Though the concentration obtained is internally consistent, it is lower compared to the currently preferred value of 6.5 ppb (Imai et al, 1995), but it should be noted that this value was derived from only two data sets (9.7 ppb and 3.3 ppb). A more recent work reported a concentration of 6.1 ppb (Shirai et al, 2003), which lies between the two previous values, while Rehkämper et al (1999) reported Ru concentrations ranging from 1.07 ppb up to 4.67 ppb in Horoman peridotites, which is the same sampling location as that of JP-1. These widely scattered concentrations determined for JP-1 make it difficult to decide which is the "true" Ru abundance for this reference rock.…”

Section: Resultsmentioning

confidence: 50%

“…The most likely reason for the large discrepancy in the Ru abundance is heterogeneity in the JP-1 reference material. Such a conclusion can be reached from the chemical similarity of Ru and Os (Lee et al, 2003), and previous reports of heterogeneity of Os content in JP-1 (Shirai et al, 2003;Suzuki and Tatsumi, 2001). As such it would be reasonable for the heterogeneity of the Os to also be seen for Ru.…”

Section: Resultsmentioning

confidence: 82%

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Determination of ruthenium contents in terrestrial minerals by isotope dilution mass spectrometry after preconcentration via distillation

Hidaka

2004

Geochem. J.

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Through the use of acid digestion and a modified distillation procedure the Ru contents in various terrestrial minerals have been determined via the stable isotope dilution mass spectrometry (IDMS) method, with isotopic analysis carried out via inductively coupled plasma mass spectrometry (ICP-MS) and negative thermal ionization mass spectrometry (N-TIMS). The uncertainties in the concentrations ranged from 2.1% to 6.0% (2σ) for ppb and ppm samples concentrations, which is comparable and in some cases better than previous work using NiS fire assay and ICP-MS (Shirai et al., 2003). However, uncertainties for ppt samples were in around 20%, due to low count rates during analysis.Results from three different mineral species show the effectiveness of this chemical dissolution and separation procedure for samples of varying Ru concentrations, ranging from ppm down to ppt levels, and varying geological matrices, from sulphides to silicates. Ru abundances measured showed results consistent with the siderophile nature of Ru, and reinforces the similarity in melt chemistry between Ru and Os.

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“…The final solution was prepared by diluting to 15 ml with deionized water. The analytical procedures are essentially identical to those described in Shirai et al (2003).…”

Section: Sample and Experimental Proceduresmentioning

confidence: 99%

Petrology and geochemistry of a silicate clast from the Mount Padbury mesosiderite: Implications for metal-silicate mixing events of mesosiderite

Tamaki

Yamaguchi

Misawa

et al. 2006

Meteoritics &Amp; Planetary Science

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Abstract-Petrological and bulk geochemical studies were performed on a large silicate clast from the Mount Padbury mesosiderite. The silicate clast is composed mainly of pyroxene and plagioclase with minor amounts of ilmenite, spinel, and other accessory minerals, and it shows subophitic texture. Pyroxenes in the clast are similar to those in type 5 eucrites and could have experienced prolonged thermal metamorphism after rapid crystallization from a near-surface melt. Ilmenite and spinel vary chemically, indicating growth under disequilibrium conditions. The clast seems to have experienced an episode of rapid reheating and cooling, possibly as a result of metal-silicate mixing. Abundances of siderophile elements are obviously higher than in eucrites, although the clast is also extremely depleted in highly siderophile elements. The fractionated pattern can be explained by injection of FeFeS melts generated by partial melting of metallic portions during metal-silicate mixing.The silicate clast had a complex petrogenesis that could have included: 1) rapid crystallization from magma in a lava flow or a shallow intrusion; 2) prolonged thermal metamorphism to equilibrate the mineral compositions of pyroxene and plagioclase after primary crystallization; 3) metal-silicate mixing probably caused by the impact of solid metal bodies on the surface of the mesosiderite parent body; and 4) partial melting of metal and sulfide portions (and silicate in some cases) caused by the collisional heating, which produced Fe-FeS melts with highly fractionated siderophile elements that were injected into silicate portions along cracks and fractures.

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Precise determination of PGE in a GSJ reference sample JP-1 by ID-ICPMS after nickel sulfide fire assay preconcentration

Abstract: All platinum group element (PGE) abundances of a standard rock JP-1 are determined by isotope dilution method (for Ru, Pd, Os, Ir and Pt) and external calibration method (only for Rh) using ICP-MS combined with a fire assay preconcentration technique. The errors range 13-25% (

Cited by 28 publications

References 26 publications

An anomalous eucrite, Dhofar 007, and a possible genetic relationship with mesosiderites

An anomalous eucrite, Dhofar 007, and a possible genetic relationship with mesosiderites

Determination of ruthenium contents in terrestrial minerals by isotope dilution mass spectrometry after preconcentration via distillation

Petrology and geochemistry of a silicate clast from the Mount Padbury mesosiderite: Implications for metal-silicate mixing events of mesosiderite

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