Developmental Research of mass spectrometric system for laser probe dating of mineral

矿物激光探针测年质谱系统的发展研究

基本信息

批准号：
03504003
负责人：
ITAYA Tetsumaru
金额：
$ 23.23万
依托单位：
Okayama University of Science
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (A)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

We have designed and constructed new mass spectrometer and the associated system with ultra high sensitivity and low background for noble gas analysis, and then proceeded the test analysis. This system has been presented at 29th Internatinal Geological Congress in Kyoto. This mass spectrometric system having three collectors has made it possible to analyze simultaneously three argon isotopes and has extremely high precision for the isotopic analysis in comparison with the present system with single collector, being powerful for dating young volcanic rocks. Unfortunately, the ion gun in MS Happened to have some troubles in middle of the final research year, making it imposible to analyze exactly natural samples now. We have required the improvement of ion gun and the rebuilding by Ayumi Industry Co., Ltd. We were not able to complete the perfect system until end of the term of project but do not think this project unsuccessful because we have already catched the basic ability of this mass spectrometric system before the trouble. We believe this is the first mass spectrometer with triple collector system for noble gas analysis in the world.We have sexamined the basic problem of argon analysis of natural rocks and minerals using the present mass spectrometer and applied the established analytical technique to geological materials. The lots of results have been published in many literatures. We have also developed laser probe argon extraction system for very small aount of materials or fine grained single crystal for Ar-Ar dating. This has made it possible to detect argon from the materials of few micro gram and control temperatures of the materials with a relative accurracy of +-1ﾟC between 500 and 1500ﾟC in the stepwise heating. This is also applicable to laser probe Ar-Ar dating of single crystal and examination of thermal history of the host rock. Its precision is probably the best in the world.

我们设计并建造了用于稀有气体分析的新型质谱仪和相关系统，并进行了测试分析。该系统已在京都举行的第29届国际地质大会上进行了展示。该质谱系统具有三个。收集器使得同时分析三种氩同位素成为可能，并且与现有的单个收集器系统相比，同位素分析具有极高的精度，对于年轻火山岩的年代测定非常有效。 MS中的离子枪在最后研究年中期遇到了一些麻烦，现在无法准确分析天然样品，我们要求Ayumi工业株式会社改进离子枪并进行重建，但我们无法做到。直到项目期限结束才能完成完美的系统，但不要认为这个项目不成功，因为我们在出现问题之前已经掌握了该质谱系统的基本能力，我们相信这是第一台带有三收集器系统的贵族质谱仪。气体分析中我们利用现有的质谱仪研究了天然岩石和矿物的氩分析的基本问题，并将已建立的分析技术应用于地质材料，并在许多文献中发表了我们还开发了激光探针氩提取。用于Ar-Ar测年的极少量材料或细晶粒单晶的系统这使得从几微克的材料中检测氩并以相对精度控制材料的温度成为可能。 500℃至1500℃之间的+-1℃，这也适用于单晶的激光探针Ar-Ar测年和母岩热历史的检查，其精度可能是世界上最好的。