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NJUCal-1: A New Calcite Oxygen Isotope Reference Material for Microbeam Analysis
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2021-07-30 , DOI: 10.1111/ggr.12403 Rucao Li 1 , Xiao‐Lei Wang 1 , Huayong Chen 2 , Hui Zheng 2 , Yue Guan 1 , Jing Gu 3 , Guishan Jin 4
Geostandards and Geoanalytical Research ( IF 2.7 ) Pub Date : 2021-07-30 , DOI: 10.1111/ggr.12403 Rucao Li 1 , Xiao‐Lei Wang 1 , Huayong Chen 2 , Hui Zheng 2 , Yue Guan 1 , Jing Gu 3 , Guishan Jin 4
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Calcite is a common mineral in various types of rocks and mineral deposits, and its oxygen isotopic compositions are widely used to reconstruct palaeotemperature and to trace rock genesis and ore-forming processes. However, the availability of high-quality matrix-matched calcite reference materials for oxygen isotope microanalysis is limited. A new natural calcite specimen (NJUCal-1) was analysed in this study to investigate its potential as a reference material for microbeam oxygen isotope measurement. Detailed textural and major elemental examinations reveal no internal zoning of ground grains. During six measurement sessions, a total of 463 spot analyses of oxygen isotope ratios were applied on ~ 200 randomly selected grains using secondary ion mass spectrometry, Nanjing. Taking all six sessions together, the spot-to-spot repeatability is 0.28‰ (2s), and the repeatability is better than 0.31‰ (2s) for individual sessions, indicating that the NJUCal-1 calcite is quite homogeneous in its oxygen isotopic compositions and can be used as a new reference material for microbeam oxygen isotope measurement. The mean δ18OVPDB value determined by gas source isotope ratio mass spectrometry is −22.58 ± 0.16‰ (2s, n = 22), which is proposed as the recommended value for this potential reference material.
中文翻译：
NJUCal-1：用于微束分析的新型方解石氧同位素参考材料
方解石是各类岩石和矿床中常见的矿物，其氧同位素组成被广泛用于古温度重建、岩石成因和成矿过程的追踪。然而，用于氧同位素微量分析的高质量基质匹配方解石参考材料的可用性是有限的。本研究分析了一种新的天然方解石样品 (NJUCal-1)，以研究其作为微束氧同位素测量参考材料的潜力。详细的结构和主要元素检查显示磨碎颗粒没有内部分区。在六次测量期间，使用二次离子质谱法对约 200 个随机选择的谷物进行了总共 463 次氧同位素比分析，南京。将所有六个会话放在一起，点到点的可重复性为 0。s )，单次重复性优于0.31‰(2 s )，说明NJUCal-1方解石的氧同位素组成相当均一，可作为微束氧同位素测量的新参考材料。气源同位素比质谱法测定的平均δ 18 O VPDB值为-22.58 ± 0.16‰ (2 s , n = 22)，建议作为该潜在参考物质的推荐值。
更新日期：2021-07-30
中文翻译：
NJUCal-1：用于微束分析的新型方解石氧同位素参考材料
方解石是各类岩石和矿床中常见的矿物，其氧同位素组成被广泛用于古温度重建、岩石成因和成矿过程的追踪。然而，用于氧同位素微量分析的高质量基质匹配方解石参考材料的可用性是有限的。本研究分析了一种新的天然方解石样品 (NJUCal-1)，以研究其作为微束氧同位素测量参考材料的潜力。详细的结构和主要元素检查显示磨碎颗粒没有内部分区。在六次测量期间，使用二次离子质谱法对约 200 个随机选择的谷物进行了总共 463 次氧同位素比分析，南京。将所有六个会话放在一起，点到点的可重复性为 0。s )，单次重复性优于0.31‰(2 s )，说明NJUCal-1方解石的氧同位素组成相当均一，可作为微束氧同位素测量的新参考材料。气源同位素比质谱法测定的平均δ 18 O VPDB值为-22.58 ± 0.16‰ (2 s , n = 22)，建议作为该潜在参考物质的推荐值。
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