Platinum group element abundances in the upper continental crust revisited – New constraints from analyses of Chinese loess

Park, Jung‐Woo; Hu, Zhaochu; Gao, Shan; Campbell, Ian H.; Gong, Hongyu

doi:10.1016/j.gca.2012.06.026

Cited by 72 publications

(58 citation statements)

References 55 publications

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“…Exceptions are: (1) (Fig. 10) [12,23,[35][36][37]. It is also notable that the Nb value we obtained for all the five USGS standards are about 9% lower than the reference values, which may be due to inaccurate Nb concentration in our Multi-element Calibration Standard solutions.…”

Section: Analysis Of Reference Materialsmentioning

confidence: 74%

Simple and cost-effective methods for precise analysis of trace element abundances in geological materials with ICP-MS

et al. 2017

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Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. an easy-to-use off-line procedure. We also show that mass-time-intensity drift curve is smooth as recognized previously, for which the correction can be readily done by analyzing a qualitycontrol (QC) solution and using off-line Excel VBA procedure without internal standards. With these methods, we can produce data in reasonable agreement with recommended values of international rock reference standards with a relative error of < 8% and precision generally better than 5%. Importantly, compared to the widely used analytical practice, we can effectively save > 60% of time (e.g., < 24 hours vs. > 60 hours).

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Section: Analysis Of Reference Materialsmentioning

confidence: 74%

Simple and cost-effective methods for precise analysis of trace element abundances in geological materials with ICP-MS

et al. 2017

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“…1, the abundance estimates for Os, Ir and Re fall within a relatively narrow range of $30%, 50% and $30% deviation from their average values, respectively. However, Ru, Pt, and Pd estimates obtained from fine-grained sediments and sedimentary rocks (Wedepohl, 1995;Peucker-Ehrenbrink and Jahn, 2001;Park et al, 2012), are generally lower, in some cases by more than one order of magnitude, compared to averages determined from large area surface sampling (Gao et al, 1998) and impact melt samples (Schmidt et al, 1997a). In addition, most of the previous estimates are not accompanied by uncertainties, except for the relatively large uncertainties reported by Schmidt et al (1997a, b).…”

Section: Introductionmentioning

confidence: 87%

“…Iridium, Ru, Pt, Pd and Re were separated and purified using anion exchange chromatography (Rehkämper and Halliday, 1997). It has been suggested that some Ru measurements reported in the literature may have been compromised due to the possible presence of Ni-argide interferences (Ravizza and Pyle, 1997;Park et al, 2012). This is especially problematic for the NiS fire assay digestion method, which involves addition of a large amount of Ni that can accompany the PGE fraction through the column chemistry.…”

Section: Analytical Techniquesmentioning

confidence: 99%

“…To evaluate sample-to-sample heterogeneity within stratigraphic units, and to assess whether the compositions of the composites are representative of the units and/or time periods, three individual diamictite samples from each of the Mozaan, Gowganda, and Nantuo Formations and the two Bolivian formations were analyzed (Table A3 Esser and Turekian, 1993Wedepohl, 1995Schmidt et al, 1997bGao et al, 1998Peucker-Ehrenbrink & Jahn, 2001Park et al, 2012 This study Errors quoted at 2r. Fig.…”

Section: Individual Diamictite Samplesmentioning

confidence: 99%

“…Some of these efforts have estimated the UCC PGE abundances by taking the average concentrations in different rock types and weighting them in proportion to the relative surface area over which they are exposed (Shaw et al, 1976;Gao et al, 1998). Another approach is to use data for fine-grained sediments and sedimentary rocks (e.g., loess and shale) to infer the PGE and Re abundances in the UCC exposed to weathering and erosion (Esser and Turekian, 1993;Wedepohl, 1995;PeuckerEhrenbrink and Jahn, 2001;Park et al, 2012). In addition, Schmidt et al (1997a) used impact melts to estimate the PGE and Re abundances in the upper crust of the Baltic Shield.…”

Section: Introductionmentioning

confidence: 99%

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Platinum-group element abundances and Re–Os isotopic systematics of the upper continental crust through time: Evidence from glacial diamictites

Chen

Walker

Rudnick

et al. 2016

Geochimica et Cosmochimica Acta

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The fine-grained matrix of glacial diamictites, deposited periodically by continental ice sheets over much of Earth history, provides insights into the average composition and chemical evolution of the upper continental crust (UCC) , and references therein). The concentrations of platinum-group elements (PGEs, including Os, Ir, Ru, Pt and Pd) and the geochemically related Re, as well as 187 Re/ 188 Os and 187 Os/ 188 Os ratios, are reported here for globally-distributed glacial diamictites that were deposited during the Mesoarchean, Paleoproterozoic, Neoproterozoic and Paleozoic eras. The medians and averages of PGE concentrations of these diamictite composites decrease from the Mesoarchean to the Neoproterozoic, mimicking decreases in the concentrations of first-row transition elements (Sc, V, Cr, Co and Ni). By contrast, Re concentrations are highly variable with no discernable trend, owing to its high solubility. Assuming these diamictites are representative of average UCC through time, the new data are fully consistent with the previous inference that the Archean UCC contained a greater proportion of mafic-ultramafic rocks relative to younger UCC. Linear regressions of PGEs versus Cr and Ni concentrations in all the diamictite composites from the four time periods are used to estimate the following concentrations of the PGEs in the present-day UCC: 0.059 ± 0.016 ng/g Os, 0.036 ± 0.008 ng/g Ir, 0.079 ± 0.026 ng/g Ru, 0.80 ± 0.22 ng/g Pt and 0.80 ± 0.26 ng/g Pd (2r of 10,000 bootstrapping regression results). These PGE estimates are slightly higher than the estimates obtained from loess samples. We suggest this probably results from loess preferentially sampling younger UCC rocks that have lower PGE concentrations, or PGEs being fractionated during loess formation. A Re concentration of 0.25 ± 0.12 ng/g (2r) is obtained from a regression of Re versus Mo. From this, time-integrated 187 Re/ 188 Os and 187 Os/ 188 Os ratios for the UCC are calculated, assuming an average UCC residence duration of $2.0 Ga, yielding ratios of 20 ± 12 and 0.80 ± 0.38 (2r), respectively.

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Strontium concentrations and isotope ratios in enamel of healthy and carious teeth in southern Shaanxi, China

Peng

et al. 2013

Rapid Comm Mass Spectrometry

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Platinum group element abundances in the upper continental crust revisited – New constraints from analyses of Chinese loess

Cited by 72 publications

References 55 publications

Simple and cost-effective methods for precise analysis of trace element abundances in geological materials with ICP-MS

Simple and cost-effective methods for precise analysis of trace element abundances in geological materials with ICP-MS

Platinum-group element abundances and Re–Os isotopic systematics of the upper continental crust through time: Evidence from glacial diamictites

Strontium concentrations and isotope ratios in enamel of healthy and carious teeth in southern Shaanxi, China

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