Non-chondritic platinum-group element ratios in oceanic mantle lithosphere: petrogenetic signature of melt percolation?

Rehkämper, Mark; Halliday, A. N.; Alt, J. C.; Fitton, J. Godfrey; Zipfel, J.; Takazawa, Eiichi

doi:10.1016/s0012-821x(99)00193-4

Cited by 153 publications

(100 citation statements)

References 34 publications

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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: Resultssupporting

confidence: 68%

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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Section: Resultssupporting

confidence: 68%

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

Hidaka

2004

Geochem. J.

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“…For example, Rehkämper et al [31] suggested that the PGE budgets of abyssal peridotites have not been significantly disturbed by low-temperature alteration (<150…”

Section: Discussionmentioning

confidence: 99%

“…• C) processes, for which is commonly taken place under very reducing conditions [31,32]. Büchl et al [33] demonstrated that the PGEs are also significantly fractionated by hydrothermal fluids.…”

Section: Discussionmentioning

confidence: 99%

Different Origins of the Fractionation of Platinum-Group Elements in Raobazhai and Bixiling Mafic-Ultramafic Rocks from the Dabie Orogen, Central China

Liu

Hou

Xie

et al. 2012

Journal of Geological Research

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Concentrations of the platinum group elements (PGEs), including Ir, Ru, Rh, Pt, and Pd, have been determined for both Raobazhai and Bixiling mafic-ultramafic rocks from the Dabie Orogen by fire assay method. Geochemical compositions suggest that the Raobazhai mafic-ultramafic rocks represent mantle residues after variable degrees of partial melting. They show consistent PGE patterns, in which the IPGEs (i.e., Ir and Ru) are strongly enriched over the PPGEs (i.e., Pt and Pd). Both REE and PGE data of the Raobazhai mafic-ultramafic rocks suggest that they have interacted with slab-derived melts during subduction and/or exhumation. The Bixiling ultramafic rocks were produced through fractional crystallization and cumulation from magmas, which led to the fractionated PGE patterns. During fractional crystallization, Pd is in nonsulfide phases, whereas both Ir and Ru must be compatible in some mantle phases. We suggest that the PGE budgets of the ultramafic rocks could be fractionated by interaction with slab-derived melts and fractional crystallization processes.

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“…Previous studies have shown that the host minerals of PGE in the mantle are most likely not silicates, but sulfides and PGE alloys (e.g., Hart and Ravizza, 1996;Humayun, 1998;Burton et al, 1999;Handler and Bennett, 1999;Rehkämper et al, 1999a;Lorand and Alard, 2001). The Ni-Cu sulfide melt-silicate partition coefficients (D) for PGE determined experimentally are on the order of 10 4 (Peach et al, 1990;Fleet et al, 1996), suggesting that Ni-Cu sulfide fractionation is the main cause for PGE depletion in basaltic magmas during differentiation.…”

Section: Pge Fractionation During Magmatic Differentiationmentioning

confidence: 99%

Platinum group elements in the Emeishan large igneous province, SW China: Implications for mantle sources

et al. 2005

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We report concentrations of platinum group elements (PGE: Os, Ir, Ru, Rh, Pt and Pd) for picrite-basalt lavas of the Emeishan large igneous province, SW China. The absolute concentrations of Os in most of the Emeishan picrites are higher than in picrites from ocean islands and other continental flood basalt provinces, and in estimated primitive mantle. A roughly positive correlation between MgO and Cr and Ni, and no overall correlation of Os or Ir with MgO, show that no Cu-Ni sulfide fractionated during differentiation but rather that olivine and chromite fractionated, implying that the initial picritic magma was sulfide-undersaturated. In addition, Os/Ir ratios are unusually high, suggesting that the picritic magmas may have been contaminated by black shales. Modeling shows that a 7% partial melt of primitive mantle containing 0.01 wt% of sulfides can account for the observed Os, Ir and Ru concentrations in the most primitive picrite if the melt is contaminated by 10 wt% of black shale en route to the surface.

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Non-chondritic platinum-group element ratios in oceanic mantle lithosphere: petrogenetic signature of melt percolation?

Cited by 153 publications

References 34 publications

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

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

Different Origins of the Fractionation of Platinum-Group Elements in Raobazhai and Bixiling Mafic-Ultramafic Rocks from the Dabie Orogen, Central China

Platinum group elements in the Emeishan large igneous province, SW China: Implications for mantle sources

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