A natural plagioclase reference material for microbeam Sr isotopic analysis

Abstract

High-quality Sr isotope data are critically dependent on the quality of reference materials that are used for instrumental calibration and data monitoring during LA-MC-ICP-MS analysis. A suite of natural plagioclase...

A natural calcite reference material for microbeam Sr isotope analysis

“…The 87 Sr/ 86 Sr precision of the mean, expressed as 2s standard deviation, ranges from 0.00004 to 0.00006 for single-grain SN-MC-ICP-MS and LA-MC-ICP-MS analyses. The precision is 0.00005 (2SD) by LA-MC-ICP-MS, which is consistent with the published values (0.00002–0.00012, 2SD) 15,24,36,40–44 of other standard references, indicating good Sr isotopic homogeneity of the MNP calcite. In addition to the precision evaluation, the mean square weighted deviation (MSWD) of repeated analyses was used to check the homogeneity, where an MSWD close to 1 indicates that the repeated analyses are the same within the analytical uncertainty.…”

“…, CPX05G, JJG1424, YY09-47, YY09-04, YY09-24, YY12-01, YY12-02, HNB), 16,22 plagioclase ( e.g. , BDL, JH56, MkAn, YG0440, YG0383, YG4301), 31,36–39 K-feldspar (Tuyk), 37 scheelite (XJSW and HTPW), 15 aragonite (JCp-1, JCt-1), 40,41 and synthetic carbonate pellets (MACS-1, MACS-3 and NanoSr). 42–44 However, JCp-1 and JCt-1 are unavailable and cannot meet the requirements of the geochemistry community.…”

“…Therefore, a carbonate reference material is essential for in situ Sr isotope analysis to calibrate inter-laboratory bias and allow quality assessment of the corrections made in the data reduction protocol. Many reference materials have been developed for in situ Sr isotope analysis, such as apatite (e.g., AP1, Eppawala-AP, Durango, MAD, Otter Lake, and Slyudyanka), 18,24,[32][33][34][35] clinopyroxene (e.g., CPX05G, JJG1424, YY09-47, YY09-04, YY09-24, YY12-01, YY12-02, HNB), 16,22 plagioclase (e.g., BDL, JH56, MkAn, YG0440, YG0383, YG4301), 31,[36][37][38][39] K-feldspar (Tuyk), 37 scheelite (XJSW and HTPW), 15 aragonite (JCp-1, JCt-1), 40,41 and synthetic carbonate pellets (MACS-1, MACS-3 and NanoSr). [42][43][44] However, JCp-1 and JCt-1 are unavailable and cannot meet the requirements of the geochemistry community.…”

In situ Ti isotopic analysis by femtosecond laser ablation MC-ICP-MS

“…The plagioclase and ilmenite (up to ∼1 mm in diameter) separates from this sample have homogeneous Sr and Fe isotope compositions, respectively, and are suggested as reference materials for micro-beam Sr and Fe isotopic analyses (Xu et al , 2022 (ref. 59 and 61) and unpublished data).…”

New reference materials, analytical procedures, and data reduction strategies for Sr isotope measurements in geological materials by LA-MC-ICP-MS

“…2). Xu et al (2022) recently characterised a plagioclase reference material (BDL-suite plagioclase) with high Sr concentration, low Rb/Sr, low HREE, and homogeneous 87 Sr/ 86 Sr. However, to our knowledge, there are few other widely used plagioclase community reference materials.…”