Highly siderophile element geochemistry of the Earth's mantle: new data for the Lanzo (Italy) and Ronda (Spain) orogenic peridotite bodies

Lorand, Jean‐Pierre; Schmidt, Gerhard; Palme, H.; Kratz, K. L.

doi:10.1016/s0024-4937(00)00017-7

Cited by 59 publications

(37 citation statements)

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“…Comparison of Ru concentrations determined here showed similar concentrations determined for spinel lherzolite from the Beni Bousera peridotite massif (6-7 ppb; Pearson and Woodland, 2000) and that determined in this study for the similar formation in the Hidaka metamorphic belt in Hokkaido (6.1 ± 0.3 ppb). Ru concentrations for the Italian Alps samples (3.3 ± 0.2 ppb) are also similar to results reported for lherzolites from Lanzo (Italy) (4.28-6.53 ppb; Lorand et al, 2000). Though Ru concentrations for the Oeyama peridotites (3.8 ± 0.1 ppb) are also in the Samples derived from the Takashima and Kurose basaltic xenolith showed similar Ru concentrations (10.7 ± 0.8 ppb and 9.6 ± 0.1 ppb, respectively) as those obtained for dunites from the Vizcaino Peninsula (average ~7.5 ppb; Vatin-Perignon et al, 2000).…”

Section: Resultssupporting

confidence: 86%

“…Complete procedural blank was 4 ± 2 pg, determined by IDMS via N-TIMS, as blanks were undetectable via ICP-MS. This is much lower than blanks reported for either nickel fire assay or sodium peroxide fusion digestion, which are generally a few ng (Lorand et al, 2000;Jackson et al, 1990;Pearson and Woodland, 2000). Blanks are also more favorable than those reported for the Carius Tube method, which are typically a few tens of pg (Pearson and Woodland, 2000;Rehkämper and Halliday, 1997).…”

Section: Analytical Procedures For Geological Samplesmentioning

confidence: 67%

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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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Section: Resultssupporting

confidence: 86%

Section: Analytical Procedures For Geological Samplesmentioning

confidence: 67%

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

Hidaka

2004

Geochem. J.

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“…However, Luguet et al (2001Luguet et al ( , 2003Luguet et al ( , 2004, Rehkämper et al (1999), Snow and Schmidt (1998), Snow et al (2000) and van Acken et al (2010). PGE compositions of continental peridotites (dashed line) in (a) and (b) are from Alard et al (2011), Becker et al (2006, , Lee (2002), Lorand and Alard (2001), Lorand et al (1999Lorand et al ( , 2000, Pearson et al (2004), Rehkämper et al (1999) and Wang et al (2013). figure 3 and melting models as in figure 6 (solid lines).…”

Section: Discussionmentioning

confidence: 98%

Platinum-group elements, S, Se and Cu in highly depleted abyssal peridotites from the Mid-Atlantic Ocean Ridge (ODP Hole 1274A): Influence of hydrothermal and magmatic processes

Marchesi

Garrido

Harvey

et al. 2013

Contrib Mineral Petrol

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Highly depleted harzburgites and dunites were recovered at ODP Hole 1274A, near the intersection between the Mid-Atlantic Ocean Ridge and the 15°20'N Fracture Zone. In addition to high degrees of partial melting, these peridotites underwent multiple episodes of melt-rock reaction and intense serpentinization and seawater alteration close to the seafloor. Low concentrations of Se, Cu and platinum-group elements (PGE) in harzburgites drilled at around 35-85 meters below seafloor are consistent with the consumption of mantle sulfides after high degrees (> 15-20%) of partial melting and redistribution of chalcophile and siderophile elements into PGE-rich residual microphases. Higher concentrations of Cu, Se, Ru, Rh and Pd in harzburgites from the uppermost and lowest cores testify to late reaction with a sulfide melt. Dunites formed by percolation of silica-and sulfur-undersaturated melts into enclosing low-Se harzburgites. Platinum-group and chalcophile elements were not mobilized during dunite formation and mostly preserve the signature of precursor harzburgites, except for higher Ru and lower Pt contents caused by precipitation and removal of platinum-group minerals. During serpentinization at low temperature (< 250 °C) and reducing conditions, mantle sulfides experienced desulfurization to S-poor sulfides (mainly heazlewoodite) and awaruite. Contrary to Se and Cu, sulfur does not record the magmatic evolution of peridotites but it was mostly added in hydrothermal sulfides and sulfate from seawater. Platinum-group elements were unaffected by post-magmatic low temperature processes, except Pt and Pd that may have been slightly remobilized during oxidative seawater alteration.

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“…Even if we consider the uncertainties of Os/Ir ratios Table 1), which are calculated from the analytical uncertainties, the Os/Ir ratios are still considerably high (>2.5). They are much higher than those of chondrites, estimated primitive mantle, or lherzolites (e.g., Ronda, Spain, Lorand et al, 2000) and komatiite from other areas (Puchtel and Humayun, 2000).…”

Section: Resultsmentioning

confidence: 73%

“…Hence, this possibility can be excluded. The second possibility of high Os/Ir is interpreted in terms of mobilization of Os by late magmatic fluids (Lorand et al, 2000), as exhibited in Ronda lherzolites (Lorand and Alard, 2001). However, the Os/Ir of the ELIP picrites are much higher than those at Ronda (~1.37).…”

Section: Pge Characteristics As Features Of the Emeishan Mantle Sourcementioning

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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Highly siderophile element geochemistry of the Earth's mantle: new data for the Lanzo (Italy) and Ronda (Spain) orogenic peridotite bodies

Cited by 59 publications

References 50 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

Platinum-group elements, S, Se and Cu in highly depleted abyssal peridotites from the Mid-Atlantic Ocean Ridge (ODP Hole 1274A): Influence of hydrothermal and magmatic processes

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

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