Isotopic Compositions (Li‐B‐Si‐O‐Mg‐Sr‐Nd‐Hf‐Pb) and Fe²⁺/ΣFe Ratios of Three Synthetic Andesite Glass Reference Materials (ARM‐1, ARM‐2, ARM‐3)

Abstract

To expand the newly developed ARM glasses as reference materials for in situ microanalysis of isotope ratios and iron oxidation state by a variety of techniques such as SIMS, LA-MC-ICP-MS and EPMA, we report Li-B-Si-O-Mg-Sr-Nd-Hf-Pb isotope data and Fe 2+ /ΣFe ratios for these glasses. The data were mainly obtained by TIMS, MC-ICP-MS, IR-MS and wetchemistry colorimetric techniques. The quality of these data was cross-checked by comparing different techniques or by comparing the results from different laboratories using the same technique. All three glasses appear to be homogeneous with respect to the investigated isotope ratios (except for B in ARM-3) and Fe 2+ /ΣFe ratios at the scale of sampling volume and level of the analytical precision of each technique. The homogeneity of Li-B-O-Nd-Pb isotope ratios at the microscale (30-120 μm) was estimated using LA-MC-ICP-MS and SIMS techniques. We also present new EPMA major element data obtained using three different instruments for the glasses. The determination of reference values for the major elements and their uncertainties at the 95% confidence level closely followed ISO guidelines and the Certification Protocol of the International Association of Geoanalysts. The ARM glasses may be particularly useful as reference materials for in situ isotope ratio analysis.

In situmeasurement of Sm–Nd isotopic ratios in geological materials with Nd < 100 μg g−1by LA-MC-ICP-MS

“…The eight geological reference glasses used in this study consisted of NIST SRM 612, 32 three USGS glasses (BCR-2G, BHVO-2G, and TB-1G), 33 three MPI-DING glasses (ATHO-G, KL2-G, and T1-G), 34 and an IGGCAS glass (ARM-2), 35 which altogether have Nd contents of 21.6–60.9 μg g −1 . Table 2 summarizes the chemical compositions of these reference glasses.…”

“…aThe major element contents are in wt% and Sm–Nd contents are in μg g −1 .bThe reference values of 143 Nd/ 144 Nd for ATHO-G, KL2-G and Tl-G are from Jochum et al , 34 for BHVO-2G and BCR-2G from Weis et al , 53 for ARM-2 from Wu et al , 35 for NIST SRM 612 from Woodhead and Hergt 32 for Durango from Yang et al , 21 respectively.cThe reference values of 147 Sm/ 144 Nd are calculated from Nd and Sm contents of these glasses.…”

“…bThe reference values of 143 Nd/ 144 Nd for ATHO-G, KL2-G and Tl-G are from Jochum et al , 34 for BHVO-2G and BCR-2G from Weis et al , 53 for ARM-2 from Wu et al , 35 for NIST SRM 612 from Woodhead and Hergt 32 for Durango from Yang et al , 21 respectively.…”

Geochronological and geochemical constraints on the origin of highly 13Ccarb-depleted calcite in basal Ediacaran cap carbonate

“…Hg, 204 (Hg þ Pb),206 Pb,207 Pb,208 Pb,232 Th and 238 U during the data acquisition. In this study, a total of four reference materials (RMs) were used including two calcite U-Pb reference materials for calibration of U/Pb ratios and validation of the results (WC-1 and Duff Brown Tank;Hill et al 2016;Roberts et al 2017) and two glass reference materials for calibration of Pb/Pb ratios and drift correction (ARM-3 and NIST SRM 614;Woodhead & Hergt, 2001;Wu et al 2021). Two analyses of glass NIST SRM 614 and ARM-3 in combination with three analyses of WC-1 were analysed bracketing every ten analyses of unknown samples.…”

Three Natural Andesitic to Rhyolitic Glasses (OJY‐1, OH‐1, OA‐1) as Reference Materials for In Situ Microanalysis

“…2005a) and the andesitic ARM‐1, 2, 3 series (Wu et al . 2019, 2021) are synthetic glasses. These glasses are commonly used as calibration materials because their trace elements occur at nearly constant mass fractions of ~ 500 μg g −1 , ~ 50 μg g −1 , ~ 5 μg g −1 and ~ 0.5 μg g −1 , providing precise calibration for microanalytical techniques, but they typically have different matrix compositions to minerals of interest.…”