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.

我们已经设计和构建了新的质谱仪和相关的系统，具有超高灵敏度和低背景的贵重气体分析，然后进行了测试分析。该系统已在京都举行的第29届内部地质大会。该质谱系统具有三个收集器，使得与本系统与本系统与单个收集器相比，同位素分析具有极高的精度，可以同时分析三个收集器，这对于与年轻的火山岩约会非常有力。不幸的是，在最后的研究年中，MS中的离子枪已经遇到了一些麻烦，这使得立即分析天然样本变得不可能。我们需要改进Ion Gun和Ayumi Industry Co.，Ltd的重建。在项目结束期结束之前，我们无法完成完美的系统，但认为该项目没有成功，因为我们已经遇到了该质谱系统的基本能力。我们认为，这是世界上使用三重收集器系统进行三重收集器系统的首个质谱仪。我们使用当前的质谱仪对天然岩石和矿物质的氩气分析的基本问题进行了性，并将既定的分析技术应用于地质材料。许多结果已经在许多文献中发表。我们还开发了针对非常小的材料背面或细粒单晶体的激光探针提取系统，用于AR-AR约会。这使得可以从材料的少数微克和对照温度的材料中检测到氩气相对精度在逐步加热中相对精确度为500至1500°C之间。这也适用于单晶体的激光探针AR-AR和宿主岩石热史的检查。它的精度可能是世界上最好的。