Journal article

Strontium isotope analysis of kimberlitic groundmass perovskite via LA-MC-ICP-MS

Chad Paton, Jon D Woodhead, Janet M Hergt, David Phillips, Simon Shee

GEOSTANDARDS AND GEOANALYTICAL RESEARCH | BLACKWELL PUBLISHING | Published : 2007

Abstract

Strontium isotopic composition is a potentially powerful tracer in studies of kimberlitic rocks but the results from even the most carefully collected and stringently prepared bulk-rock samples are still hampered by contamination and alteration effects. Here we describe a LA-MC-ICP-MS technique which can obtain accurate, high precision Sr i ratios from 50-150 μm kimberlitic groundmass perovskite without requiring time-consuming mineral separation procedures. Since perovskite is a robust magmatic phase with an extremely low Rb/Sr ratio, the effects of late-stage crustal contamination, post-emplacement alteration and age correction are minimised and results are more representative of primary m..

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