地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
ISSN-L : 0022-135X
レーザーマイクロプローブ40Ar/39Ar年代測定
兵藤 博信板谷 徹丸松田 高明
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2000 年 109 巻 6 号 p. 827-835

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Laser probe 40Ar/39Ar age dating can be applied in two ways. One is in situ spot age dating of a thin section using a pulsed laser, and the other is stepwise heating of a single mineral using a continuous laser. In the last 10 years, advances in technology have allowed us to apply the laser probes in various ways in Earth and planetary sciences. Stepwise data provide diffusion characteristics in each single mineral. The spatial resolution of laser pits can be as small as 5 microns, which is comparable to the figure for electron probe microanalysis. Utilizing this high resolution, 40Ar/39Ar applications combined with petrology are expected to contribute to a new understanding of argon diffusion and the Earth's history.

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