Re–Os systematics of UB-N, a serpentinized peridotite reference material

Unravelling the effects of melt depletion and secondary infiltration on mantle Re–Os isotopes beneath the French Massif Central

“…However, the digestions of UB-N, duplicate digestions of MBr bulk-275 rock samples (MBr9 and MBr16) by LTAA, and duplicates of an in-house peridotite 276 standard from Kilbourne Hole, dissolved by both LTAA and Carius tubes (Shirey and 277 Walker, 1995), performed during this study suggest that digestions in small vessels (7 278 mL) yield reproducible results. Osmium concentrations obtained during this study are 279 higher than those derived by LTAA by Meisel et al, (2003) for bulk-rock Os during this study was 0.29 ± 0.26 pg, 187 Os/ and for bulk-rock Re 3.13 ± 2.37 pg. The short-term reproducibility of the blank was 294 ± 10 % or better, but the absolute values varied between each batch of prepared 295 reagents.…”

“…Samples were digested in an oven at 140 o C for not less than 72 hours 265 (cf. Meisel et al, 2003). The samples were removed from the oven on a daily basis, 266…”

“…The reference material UB-N, a 270 serpentinized peridotite, was digested several times (n = 3) to assess the efficacy of 271 12 the LTAA dissolution method for bulk-rock peridotite. Meisel et al, (2003) suggested 272 that LTAA is not an efficient means for peridotite dissolution, often leaving resistant 273 phases undissolved and leading to poor reproducibility of Os concentrations and Os 274 isotope ratios. However, the digestions of UB-N, duplicate digestions of MBr bulk-275 rock samples (MBr9 and MBr16) by LTAA, and duplicates of an in-house peridotite 276 standard from Kilbourne Hole, dissolved by both LTAA and Carius tubes (Shirey and 277 Walker, 1995), performed during this study suggest that digestions in small vessels (7 278 mL) yield reproducible results.…”

Evaluation of a technique for determining Re and PGEs in geological samples by ICP-MS coupled with a modified Carius tube digestion

“…The determination of PGEs in geological materials is difficult because of their low abundance and heterogeneous distributions and the complexity of sample preparation. Methods for dissolving geological samples and thereby for concentrating PGEs include nickel sulfide (NiS) fire assay coupled with Te coprecipitation (Jackson et al, 1990;Zhou et al, 2001;Gros et al, 2002;Juvonen et al, 2002;Sun and Sun, 2005), acid attack combined with Na 2 O 2 fusion (Morgan and Walker, 1989;Yi and Masuda, 1996;Dai et al, 2001;Qi et al, 2003Qi et al, , 2004, aqua regia dissolution in a sealed Carius tube, and high pressure asher (HPA-S) (Shirey and Walker, 1995;Cohen and Waters, 1996;Rehkämper et al, 1998;Pearson and Woodland, 2000;Brauns, 2001;Meisel et al, 2001Meisel et al, , 2003aMeisel et al, , 2003bPretorius et al, 2003;Meisel and Moser, 2004). The advantages and disadvan-bration between spikes and samples.…”

“…The advantages and disadvan-bration between spikes and samples. However, 1-2 g sample is commonly used in a Carius tube and HPA-S (Pearson and Woodland, 2000;Meisel et al, 2001Meisel et al, , 2003aMeisel et al, , 2003bMeisel and Moser, 2004), with aqua regia less than one third of the total volume of the Carius tube to avoid possible crack caused by high internal pressure in the Carius tube.…”