Development of a New Safe, Simple and Rapid Technique for Silicate and Oxide d18O Analyses

硅酸盐和氧化物的稳定氧同位素分析作为一种技术在火成岩和变质岩学和地球化学中早已被广泛应用。硅酸盐和氧化物d18O分析的令人沮丧的难题是，虽然许多研究人员热衷于使用这种技术，但这些分析需要使用极其危险的试剂，并且执行这些分析所需的操作人员技能和培训水平非常高。该分析方法安全、快速、简便。这项新技术将把市售的高温元素分析仪与稳定同位素比质谱仪连接起来，并且是对现有分析技术的改进，该分析技术成功地使用了低温元素分析仪来测量其他材料的d18O。新技术不使用F2、BrF5等有害氟化试剂，操作复杂性相对较低。使用五种常用的地质分析矿物（石英、钾晶石、斜长石、橄榄石和磁铁矿）测量氧浓度的初步实验表明，这些材料定量反应形成CO，然后用于d18O分析。所有进行常规和激光BrF5氧同位素分析的必要设备都可以在内华达大学里诺分校获得，并将用于验证使用新开发的技术进行分析的准确性和精密度。如果提出的技术被证明是成功的，这将极大地促进这种分析在地球科学和相关研究中的应用。这将为研究人员，特别是学生提供更多的可访问性，这些研究人员目前希望进行这些分析，但由于现有技术存在安全隐患而被劝阻。反过来，这将有力地促进岩石学和地球化学领域的研究。

EAR-0447229Poulson Stable oxygen isotope analysis of silicates and oxides has long been used as a technique in igneous and metamorphic petrology and geochemistry, with a large number of applications. The frustrating conundrum of silicate and oxide d18O analyses is that while many researchers are keen to use this technique, these analyses require the use of extremely hazardous reagents, and the level of operator skill and training required to perform these analyses is very high. The proposed new analytical technique is a safe, rapid, and simple technique. The new technique will interface a commercially-available very high temperature elemental analyzer to a stable isotope ratio mass spectrometer, and is a modification of an existing analytical technique that successfully uses a low temperature elemental analyzer to measure d18O of other materials. The new technique does not use any hazardous fluorination reagents such as F2 or BrF5, and the complexity of operation is relatively low. Preliminary experiments to measure oxygen concentrations using five commonly-analyzed minerals of geological interest (quartz, K-spar, plagioclase, olivine, and magnetite) indicate that these materials quantitatively react to form CO, which is then used to perform d18O analyses. All the necessary equipment for performing conventional and laser BrF5 oxygen isotope analyses are available at the University of Nevada-Reno, and will be used to verify the accuracy and precision of analyses performed using the newly developed technique. If the proposed technique proves to be successful, this will dramatically promote the use of this analysis in geosciences and related research. This will allow for increased accessibility for researchers, especially students, that currently would like to perform these analyses, but are dissuaded due to the safety hazards associated with the existing techniques. In turn, this should provide a significant stimulus to promote research into the fields of petrology and geochemistry.