NITROGEN ISOTOPE GEOCHEMSITRY AT NANO-MOLE LEVEL

纳摩尔水平的氮同位素地球化学

• 批准号: 08404036
• 负责人: SANO Yuji
• 金额: $ 21.06万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08404036/
• 关键词: NITROGEN; ISOTOPE; GEOCHEMISTRY; ARGON; HELIUM; CARBON; VOLCANIC GAS; GROUNDWATER; 窒素同位体; 宇宙化学; 質量分析計; 地球大気; マントル

We have improved noble gas mass spectrometer for nitrogen isotope measurement at sub-nano mole level. Low background high vacuume line was constracted for separation and purification of nitrogen and argon from rock and gas samples. In 1996, we started basic experiment of nitrogen isotope measurements using noble gas mass spectrometer. We also adjuested helium isotope mass spectrometer already installed at Hiroshima University for groundwaater and volcanic gas research. Separation of carbon dioxide from the samples was conducted using another vacuum line. In 1997, we succeeded in nitrogen isotope measurements at*O.3% using sub-namo mole sample. This is the best analytical system in the world at the time. Helium isotope and tritium analysis of groundwater samples were made at the same time using another vacuum line and mass spectrometer. These data are important for origin and evolution of groundwater in sedimentary basin. In 1998, we have developed argon measurement system using QMS.Bayed on the system, we could analyze argon isotopes and helium abundances in volcanic gas samples in addition to nitrogen and helium isotopes. We also improved gas extraction system from rock samples using a high vacuum ball mil. This is good for oceanic-basalt glass samples with low nitrogen abundances. Several important results were obtained by the system and they were published in international journals.

我们改进了惰性气体质谱仪，用于亚纳米摩尔水平的氮同位素测量。建造低本底高真空生产线，用于从岩石和气体样品中分离和纯化氮气和氩气。 1996年，我们开始利用惰性气体质谱仪测量氮同位素的基础实验。我们还调整了广岛大学已安装的用于地下水和火山气体研究的氦同位素质谱仪。使用另一条真空管线从样品中分离二氧化碳。 1997年，我们利用亚纳摩尔样品成功测量了*O.3%的氮同位素。这是当时世界上最好的分析系统。使用另一台真空管线和质谱仪同时对地下水样品进行氦同位素和氚分析。这些数据对于沉积盆地地下水的起源和演化具有重要意义。 1998年，我们开发了采用QMS的氩测量系统。在该系统上，除了氮和氦同位素之外，我们还可以分析火山气体样品中氩同位素和氦丰度。我们还使用高真空球磨机改进了从岩石样品中提取气体的系统。这对于氮丰度较低的海洋玄武岩玻璃样品很有好处。该系统取得了多项重要成果并发表在国际期刊上。

项目成果

Y.Sano et al.: "Nitrogen recycling in subduction zones" Geophysical Research Letters. 25. 2289-2292 (1998)

Y.Sano 等人：“俯冲带中的氮循环”地球物理研究快报。

Y.Sano: "Nitrogen isotope geochemistry" Monthly Earth. supplement 18. 164-170 (1997)

Y.Sano：《氮同位素地球化学》地球月刊。

佐野 有司: "窒素同位体の地球化学" 月刊地球. 号外18. 164-170 (1997)

佐野裕二：“氮同位素的地球化学”地球月刊额外 18. 164-170 (1997)。

Y.Sano: "Helium and carbon isotope study on magmatic hydrothermal process at subsurface region" Mem.Geol.Soc.Japan. 46. 83-90 (1996)

Y.Sano：“地下区域岩浆热液过程的氦和碳同位素研究”Mem.Geol.Soc.Japan。

佐野有司: "窒素同位体の地球化学" 月刊地球. 号外18. 164-170 (1997)

佐野裕二：《氮同位素地球化学》地球月刊额外 18. 164-170 (1997)。