Plagioclase, one of the most common rock-forming minerals, can provide useful information on the crystallisation environment, magmatic evolution and thermal history of host rocks. Owing to matrix effects, trace element and Sr isotope in situ measurements in plagioclase have been hindered by a shortage of reference materials for quality control and method validation. A natural plagioclase sample from Madagascar was evaluated for its feasibility as a reference material for Sr isotope and element determination. Measurement results from EPMA, LA-ICP-MS and LA-MC-ICP-MS indicate that MGP-1 plagioclase is homogeneous at the μm–mm scale with respect to major elements (RSD < 4%), most trace elements (RSD < 15%), and ⁸⁷Sr/⁸⁶Sr ratio (2s = 0.00013). Major and trace elements were also determined using XRF and solution ICP-MS, showing good agreement within 10% from in situ measurement results. The ⁸⁷Sr/⁸⁶Sr ratio obtained by TIMS ranged from 0.703441 to 0.703477, with a mean value of 0.703459 (2s = 0.000028), consistent with the LA-MC-ICP-MS mean value. Reference values and uncertainties for major and trace elements and ⁸⁷Sr/⁸⁶Sr ratio are presented in this study. Consequently, the MGP-1 plagioclase can be used as a reference material for in situ measurement of trace elements and ⁸⁷Sr/⁸⁶Sr ratios, contributing to research on the formation and evolution of micro-zoned plagioclase and host rocks.

中文翻译：

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MGP-1 斜长石：用于原位微量分析的潜在元素和 Sr 同位素参考材料

斜长石是最常见的造岩矿物之一，可以提供有关主岩结晶环境、岩浆演化和热历史的有用信息。由于基质效应，斜长石中微量元素和锶同位素的原位测量因质量控制和方法验证参考材料的缺乏而受到阻碍。评估了来自马达加斯加的天然斜长石样品作为锶同位素和元素测定参考材料的可行性。 EPMA、LA-ICP-MS 和 LA-MC-ICP-MS 的测量结果表明，MGP-1 斜长石的主量元素 (RSD < 4%)、大多数微量元素 (RSD < 15%）和⁸⁷ Sr/ ⁸⁶ Sr 比率（2 s = 0.00013）。还使用 XRF 和溶液 ICP-MS 测定了主要元素和痕量元素，与原位测量结果显示出 10% 以内的良好一致性。 TIMS测得的87 Sr/ ⁸⁶ Sr比值范围为0.703441～0.703477，平均值为0.703459（2 s = 0.000028），与LA ^- MC-ICP-MS平均值一致。本研究提供了主量元素和微量元素以及⁸⁷ Sr/ ⁸⁶ Sr 比率的参考值和不确定度。因此，MGP-1斜长石可作为微量元素和⁸⁷ Sr/ ^{86 Sr比值}原位测量的参考材料，为微区斜长石及围岩的形成和演化研究做出贡献。