Testing <scp>Nano?Powder</scp> and <scp>Fused?Glass</scp> Mineral Reference Materials for <i>In Situ</i> <scp>Rb?Sr</scp> Dating of Glauconite, Phlogopite, Biotite and Feldspar via <scp>LA?ICP?MS</scp> / <scp>MS</scp>

Abstract Reference materials (RMs) with well-characterised composition are necessary for reliable quantification and quality control of isotopic analyses geological samples. For in situ Rb-Sr analysis silicate minerals via laser ablation inductively coupled plasma tandem mass spectrometry (LA-ICP-MS/MS) a collision/reaction cell, there is general lack mineral-specific matrix-matched RMs, which limits wider application this new laser-based dating technique to certain minerals. In work, pressed nano-powder pellets (NP) four GL-O (glauconite), Mica-Mg (phlogopite), Mica-Fe (biotite) FK-N (K-feldspar), were analysed tested dating, complemented by isotope dilution (ID) MC-ICP-MS Mica-Mg. addition, we attempted develop alternative flux-free fused ‘mineral glasses’ from the above RMs applications. Overall, results study showed that among only two NP (Mica-Mg-NP GL-O-NP) suitable robust These reference materials, Mica-Mg-NP GL-O-NP, thus used as primary normalise determine ages three natural minerals: MDC phlogopite glauconite grains, also Mica-Fe-NP (biotite). Our yielded good agreement (within 8%) published ages, suggests both GL-O-NP phlogopite, biotite. However, using secondary recommended monitor obtained ages.