This work presents Sm-Nd and Sr isotopic ratios of the BRP-1 (“Basalt Ribeirão Preto”) reference material (RM) based on repeated TIMS measurements over twelve years carried out by the LAGIR laboratory, Brazil. The BRP-1 RM was produced by the Brazilian Geological Survey from a ca. 130 Ma within-plate basalt, collected from a quarry near Ribeirão Preto city in the Paraná basin. Isotope ratios were measured using a TRITON mass spectrometer. Instrumental bias and fractionation corrections were performed based on repeated measurements of the certified RMs JNdi-1 and NIST SRM 987. The measured Nd and Sr isotopic ratios of BRP-1 are: ¹⁴³Nd/¹⁴⁴Nd = 0.512408 ± 0.000010 (2s), and ⁸⁷Sr/⁸⁶Sr = 0.706011 ± 0.000017 (2s). The mass fractions of Sm and Nd are 11.0 ± 0.2 and 51.9 ± 0.6 μg g^-1, respectively, showing no significant differences compared with the accepted values from the literature. No significant difference between measurements was observed, whether digesting samples in single or batch mode, using metal-jacketed PTFE bombs or PFA vials, or with or without the addition of a spike. The accuracy of these results was evaluated through the measurement of well-characterised USGS RMs, such as AGV-1, BCR-1, BHVO-1, G-2 and GSP-1.

中文翻译：

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参考材料玄武岩 Ribeirão Preto (BRP-1) 的 ID-TIMS Sm-Nd 和 Sr 同位素比

这项工作基于巴西 LAGIR 实验室十二年来重复的 TIMS 测量，展示了 BRP-1（“Basalt Ribeirão Preto”）参考材料 (RM) 的 Sm-Nd 和 Sr 同位素比率。BRP-1 RM 是由巴西地质调查局从大约 1000 吨的矿石中生产出来的。130 Ma 板内玄武岩，采自巴拉那盆地 Ribeirão Preto 市附近的采石场。使用 TRITON 质谱仪测量同位素比率。根据经认证的 RM JNdi-1 和 NIST SRM 987 的重复测量进行仪器偏差和分级校正。测得的 BRP-1 的 Nd 和 Sr 同位素比率为：¹⁴³ Nd/ ¹⁴⁴ Nd = 0.512408 ± 0.000010 (2 s )，和⁸⁷ Sr/ ⁸⁶ Sr = 0.706011 ± 0.000017 (2秒)。Sm和Nd的质量分数分别为11.0±0.2和51.9±0.6 μg g ^-1，与文献中公认的值相比没有显着差异。无论是使用金属护套 PTFE 炸弹或 PFA 小瓶，还是以单次或批量模式消解样品，或者添加或不添加尖峰，测量结果之间均未观察到显着差异。这些结果的准确性是通过测量经过充分表征的 USGS RM（例如 AGV-1、BCR-1、BHVO-1、G-2 和 GSP-1）来评估的。