Magnesium isotopic homogeneity of San Carlos olivine: a potential standard for Mg isotopic analysis by multi-collector inductively coupled plasma mass spectrometry

摘要

RATIONALE: Previous analyses on San Carlos olivine from Arizona (USA) have shown inter-laboratory delta Mg-26 differences of up to 0.67 parts per thousand, while mantle olivine samples worldwide are homogeneous at a current analytical uncertainty of similar to 0.1 parts per thousand. The differing measurements on San Carlos olivine may be attributable to analytical artifacts or sample heterogeneity. The latter must be ruled out before using it as a standard for Mg isotopic analysis.