2016 Fiscal Year Final Research Report
A challenge to in-situ submicrometer (U-Th)/He chronology for minerals.
| Project/Area Number |
15K13598
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Geochemistry/Cosmochemistry
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| Research Institution | Hokkaido University |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2017-03-31
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| Keywords | 地球化学 / 年代学 / ジルコン / ヘリウム / テクトニクス / レーザーイオン化 / 二次中性粒子質量分析法 |
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| Outline of Final Research Achievements |
(U-Th)/He chronology, which show the lowest closure temperature among chronological methods, is useful for analysis of geological history under low temperature such as formation processes of mountains. Thus, in-situ microanalyses of He in minerals are demanded. However, helium microanalyses are limited larger than a spatial resolution of several tens micrometers using conventional techniques, which is not smaller than a typical range of He recoil losses. Here, we develop sputtered neutral mass spectrometry to analyze He in natural zircon crystal. We have succeeded that the in-situ analysis can apply to measure He in zircon having more than 1 ppm concentrations with a spatial resolution of 7 μm which is much smaller than recoil loss range of alpha-particles.
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| Free Research Field |
地球化学
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