Rhenium‐Osmium Isotope Measurements of Geological Reference Material <scp>BIR</scp>‐1a: Evaluation of Homogeneity and Implications for Method Validation and Quality Control

Li, Jie; Long, Xiaoping; Sun, Shi‐Gang; Yin, Lu; Dai, Mingchong

doi:10.1111/ggr.12180

Cited by 20 publications

(25 citation statements)

References 48 publications

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“…, Zhang et al . ), compared with our measurement results. In Figure a, b, we did not distinguish data from previous studies obtained by non‐desilicified and desilicified with HF, because Ishikawa et al .…”

Section: Resultsmentioning

confidence: 74%

“…, Zhang et al . ). We measured the 187 Os/ 188 Os ratio of BIR‐1a using 500, 30 and 3 mg of the powdered sample, which contain approximately 150, 10 and 1 pg of Os, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…, Zhang et al . ). Although the total number of measurements was small, the variance of the Os mass fraction became larger as the test portion mass decreased.…”

Section: Resultsmentioning

confidence: 97%

“…() and Zhang et al . () concluded that desilicification step with HF is not required for Os from BIR‐1a. However, we excluded the data in Ishikawa et al .…”

Section: Resultsmentioning

confidence: 99%

“…() (filled triangles) and Zhang et al . () (filled circles). Because the details of test portion masses of Li et al .…”

Section: Resultsmentioning

confidence: 99%

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Refinement of the Micro‐Distillation Technique for Isotopic Analysis of Geological Samples with pg‐Level Osmium Contents

Nakanishi

Yokoyama

Ishikawa

2019

Geostandard Geoanalytic Res

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In recent years, the 187Re–187Os isotope system has been increasingly used to study samples containing very small quantities of Os. For such samples, optimisation of measurement procedures is essential to minimise the loss of Os before mass spectrometric measurements. Micro‐distillation is a necessary purification step that is applied after the main Os chemical separation procedure, prior to Os isotope ratio measurements by negative‐thermal ionisation mass spectrometry (N‐TIMS). However, unlike the other separation steps, this procedure has not yet been optimised for small samples. In this study, we present a refined micro‐distillation method that achieved higher yields and allowed high‐precision R(187Os/188Os) expressed as 187Os/188Os measurements for small‐sized geological samples that contain only a few pg Os. The Os recovery in the micro‐distillation step was tested by changing the operating conditions including heating time and temperature, and amounts of oxidant and reductant. Recoveries were measured by the isotope dilution ICP‐MS method after the addition of 190Os‐enriched spike solution. We found that the most critical factor controlling the chemical yield of Os during micro‐distillation is the extent of dilution of the reductant (HBr) by H2O evaporated from the oxidant. A refined micro‐distillation method, in which the amount of oxidant solution is reduced from the conventional method, achieved an improved chemical yield of Os (~ 90%). This refined method was applied to the measurement of 187Os/188Os by N‐TIMS of varying test portions of the geological reference material BIR‐1a. The resulting 187Os/188Os ratios of BIR‐1a matched the literature data, with propagated uncertainties of 0.2, 1.1 and 11% digested sample quantities containing 150, 10 and 1 pg of Os, respectively.

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Section: Resultsmentioning

confidence: 74%

“…, Zhang et al . ). We measured the 187 Os/ 188 Os ratio of BIR‐1a using 500, 30 and 3 mg of the powdered sample, which contain approximately 150, 10 and 1 pg of Os, respectively.…”

Section: Resultsmentioning

confidence: 97%

“…, Zhang et al . ). Although the total number of measurements was small, the variance of the Os mass fraction became larger as the test portion mass decreased.…”

Section: Resultsmentioning

confidence: 97%

“…() and Zhang et al . () concluded that desilicification step with HF is not required for Os from BIR‐1a. However, we excluded the data in Ishikawa et al .…”

Section: Resultsmentioning

confidence: 99%

“…() (filled triangles) and Zhang et al . () (filled circles). Because the details of test portion masses of Li et al .…”

Section: Resultsmentioning

confidence: 99%

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Refinement of the Micro‐Distillation Technique for Isotopic Analysis of Geological Samples with pg‐Level Osmium Contents

Nakanishi

Yokoyama

Ishikawa

2019

Geostandard Geoanalytic Res

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Two mineralization events in the Laozuoshan Au deposit, north‐east China: Evidence from Re–Os geochronology and trace element geochemistry

et al. 2020

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The Laozuoshan deposit, located in the central Jiamusi Block of north-east China, is characterized by two types of mineralization, including principal skarn-type Au mineralization occurring along the contact zone between granite and migmatite, and minor auriferous quartz-arsenopyrite veins hosting in plagiogranite and granite. Re-Os dating of auriferous pyrrhotite and arsenopyrite were performed to determine the metallogenic ages of the Laozuoshan gold deposit. Analyses of arsenopyrite from quartz vein-type ores yield a weighted average model age of 89.0 ± 3.1 Ma (mean standard weighted deviation(MSWD) = 9.3), which is within uncertainty in agreement with the 187 Re/ 188 Os versus 187 Os/ 188 Os isochron age of 93.2 ± 2.6 Ma (MSWD = 1.3) and the 187 Re versus 187 Os isochron age of 97 ± 14 Ma (MSWD = 7.4). Pyrrhotite samples from skarn-type ores have model ages from 82.6 Ma to 424.8 Ma, indicating an unclosed Re-Os isotope system. However, the skarn-type Au mineralization likely occurred during the Permian following the emplacement of the Laozuoshan granite.Results of laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) trace element analysis show that element contents in sulphides from different types of ores are systematically different. Au, Ag, Bi, Pb, Co, and Ni are significantly enriched in skarn-type arsenopyrite. These data suggest that the Laozuoshan deposit formed from two gold mineralization events. Combined with previous studies, we suggest that the skarn-type Au mineralization was associated with the subduction of the Panthalassic oceanic plate, whereas the rollback of the Palaeo-Pacific Plate was responsible for the quartz vein-type Au mineralization in the Laozuoshan deposit. The multiple mineralization events have important implications for regional exploration.

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A new HNO₃ digestion procedure for Re–Os isotope analysis and its implications for organic‐rich sedimentary rocks and mafic rocks

Zhao

Long

et al. 2023

Geological Journal

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The precision of available Re–Os isotope analysis for organic‐rich sedimentary (ORS) rocks is influenced by the coexisting clastic and organic components and the considerable differences between Re and Os mass fractions in such rocks. Here, we present a new method to analyse Re–Os isotopes of organic‐rich sedimentary (ORS) rocks by thermal ionization mass spectrometry. Nitric acid (HNO3) was used as the single digestion medium, and this method mainly relies on HNO3 at the optimum digestion condition, which can both equilibrate Os isotope between spike and sample and prevent the dissolving of clastic particles as many as possible especially the non‐aqueous elements inside. After a series of condition experiments, our data demonstrate that digestion temperatures and durations play important roles not only on the equilibrium between sample and spike, but also on the dissolving‐out quantity of non‐aqueous Re and Os elements. The optimum condition of 24 h and 230°C (the obtained Re and Os concentrations for the oil shale reference material SGR‐1b, and the 187Os/188Os ratios are 33.44 ± 0.09 ng/g, 0.4452 ± 0.0107 ng/g and 1.7822 ± 0.0439, n = 3, 1SD) can produce the Re–Os isotopic ratios of ORS at a precise level, and restrain the liberation of clastic Re and Os. This method at the digestion condition of 24 h and 230°C, therefore, will increase the accuracy of Re–Os isotope analysis of ORS on the basis of low blank and high efficiency. When this method is used for olivine tholeiite reference materials (BIR‐1a), the result demonstrates that the Os isotopes of mafic rocks do not produce fractionation when the temperature is higher than 200°C during the HNO3 digestion.

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Rhenium‐Osmium Isotope Measurements of Geological Reference Material BIR‐1a: Evaluation of Homogeneity and Implications for Method Validation and Quality Control

Cited by 20 publications

References 48 publications

Refinement of the Micro‐Distillation Technique for Isotopic Analysis of Geological Samples with pg‐Level Osmium Contents

Refinement of the Micro‐Distillation Technique for Isotopic Analysis of Geological Samples with pg‐Level Osmium Contents

Two mineralization events in the Laozuoshan Au deposit, north‐east China: Evidence from Re–Os geochronology and trace element geochemistry

A new HNO₃ digestion procedure for Re–Os isotope analysis and its implications for organic‐rich sedimentary rocks and mafic rocks

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Rhenium‐Osmium Isotope Measurements of Geological Reference Material BIR‐1a: Evaluation of Homogeneity and Implications for Method Validation and Quality Control

Cited by 20 publications

References 48 publications

Refinement of the Micro‐Distillation Technique for Isotopic Analysis of Geological Samples with pg‐Level Osmium Contents

Refinement of the Micro‐Distillation Technique for Isotopic Analysis of Geological Samples with pg‐Level Osmium Contents

Two mineralization events in the Laozuoshan Au deposit, north‐east China: Evidence from Re–Os geochronology and trace element geochemistry

A new HNO3 digestion procedure for Re–Os isotope analysis and its implications for organic‐rich sedimentary rocks and mafic rocks

Contact Info

Product

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A new HNO₃ digestion procedure for Re–Os isotope analysis and its implications for organic‐rich sedimentary rocks and mafic rocks