International Association of Geoanalysts Certificate of Analysis: Certified Reference Material OU‐6 (Penrhyn Slate)

Abstract

This certified reference material is intended to be used in the analysis of geological materials -rocks, soils and sediments -or other materials that have a silicate matrix. A unit of OU-6 includes approximately 35 g of pulverised material (98.33% of material < 63 µm and 0.03% > 125 µm) and is packaged in a plastic envelope.The certification project was carried out under the direction of the IAG certification committee following the IAG protocol for the certification of reference materials (Kane et al. 2003). Analyses were provided by thirty participating IAG laboratories, qualified by their performance in the GeoPT™ proficiency testing programme round nine (Potts et al. 2001).The certified concentrations are given in Table 1 for ten major oxides and thirty-five trace elements; information values are given for nine other oxides/elements in the same table. The values are based on measurements using two or more independent analytical techniques. In some cases, definitive methods (e.g., gravimetry for major oxides, isotope dilution-mass spectrometry (ID-MS) for a select few elements) have been used, though generally, certified values were established using comparative analytical techniques.

Geochronology, petrogenesis and metallogeny of Piaotang granitoids in the tungsten deposit region of South China

“…The precision was generally better than 5% for most trace elements. Analyses of international standards OU-6 and GBPG-1 are in agreement with recommended values (Thompson et al, 2000;Potts and Kane, 2005).…”

U–Pb zircon age, geochemical and Sr–Nd isotopic data as constraints on the petrogenesis and emplacement time of andesites from Gerze, southern Qiangtang Block, northern Tibet

“…These determinations are the best estimates of the crystallization ages of samples JC01 and GZ01. The rejected JC6-6 JC6-9 JC7-1 JC7-2 JC7-5 JC7-6 JC8-2 JC8-6 JC9-4 JC10-2 JC10-3 JC10-6 JC12-1 JC12-2 JC12-3 JC12-4 JC12-J JC12-6 GZ1 -1 GZ1 -2 GZ1 -3 GZ2-2 GZ2-5 GZ3-1 GZ3-3 GZ3-4 Thompson et al (2000); those for OU-6 are from Potts and Kane (2005). analyses, which yield 206 Pb/ 238 U ages of 1911 Ma (JC01, spot 1), 1864 Ma (GZ01, spot 4), and 1882 Ma (GZ01, spot 9), are interpreted to represent inherited zircons.…”

Tracing the composition, fluid source and formation conditions of the methane-derived authigenic carbonates in the Gulf of Cadiz with rare earth elements and stable isotopes

“…The sensitivity of the instrument was adjusted to about 350,000 counts per second (cps) for 1 ng/ml 115 In and 150,000 cps for 1 ng/ml of 232 Th using the normal sensitivity mode. Analytical results and the uncertainties with the reference material, AMH-1 (andesite) and OU-6 (slate) are listed in Table 2 (Thomson et al, 1999;Potts and Kane, 2005). The average relative standard error of the ICP-MS analyse is estimated to be better than ±5e10% for most elements.…”