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

EAR-0447229硅酸盐和氧化物的Poulson稳定氧同位素分析长期以来一直作为一种技术应用于火成岩和变质岩石学和地球化学中，并有大量的应用。硅酸盐和氧化物d18O分析令人沮丧的难题是，尽管许多研究人员热衷于使用这项技术，但这些分析需要使用极其危险的试剂，而且执行这些分析所需的操作员技能和培训水平非常高。所提出的新的分析技术是一种安全、快速和简单的技术。这项新技术将把商业上可用的极高温元素分析仪与稳定的同位素比质谱仪连接起来，是对现有分析技术的改进，现有技术成功地使用低温元素分析仪来测量其他材料的d18O。新技术不使用F2或BrF5等任何有害氟化试剂，操作复杂程度相对较低。使用五种常见的地质矿物(石英、钾石、斜长石、橄榄石和磁铁矿)测量氧浓度的初步实验表明，这些物质定量地反应生成CO，然后用于进行d18O分析。内华达大学雷诺分校提供了进行常规和激光BrF5氧同位素分析的所有必要设备，这些设备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。如果拟议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使用。这将增加研究人员的可及性，特别是学生，他们目前希望进行这些分析，但由于与现有技术相关的安全隐患而被劝阻。反过来，这将为推动岩石学和地球化学领域的研究提供重要的刺激。

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.