“…[9][10][11][12] Compared with the solution nebulizer (SN)-MC-ICP-MS technique which requires complex and time-consuming sample preparation, the microbeam analytical technique, notably the laser ablation (LA)-MC-ICP-MS with high sensitivity and spatial resolution, has been widely used to obtain the grain-or subgrain-scale Sr isotopic ratios. 9,[12][13][14][15][16] In addition to the correction of isobaric interferences (Rb and Kr), 9,[17][18][19][20] doubly charged rare earth elements (Yb 2+ and Er 2+ ) 15,[21][22][23][24] and using a reactive gas in a collision/reaction cell (CRC) to allow Sr + to react but not Rb + , [25][26][27][28] a matrix-matched reference material is essential to reduce element fractionation and obtain high-quality Sr isotopic ratios during in situ Sr isotope analyses. The dri of 87 Sr/ 86 Sr ratios determined from reference values has been observed in previous studies, even though the samples have high Sr contents and low Rb/Sr ratios.…”