| Laser step-heating ^40Ar/^39Ar dating on young volcanic rocks |
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| 作者姓名： | WANG Fei HE Huaiyu ZHU Rixiang YANG Liekun SANG Haiqing WANG Yinglan |
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| 作者单位： | Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing 100029, China |
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| 基金项目： | Acknowledgements The authors would like to thank Prof. M. A. Lanphere for providing standard sample RAC-20. This work was supported by National Natural Science Foundation of China （Grant No. 40473031）. |
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| 摘 要： | An attempt was made to use CO_2 laser step-heating method to date the late Pleistocene basaltic groundmass (DF-2) from Tengchong volcanic field. Among the fourteen heating steps, ten define a good inverse isochron (MSWD = 1.4) with an age of 32.2 ± 7.1 ka (2 σ).The inverse isochron also shows that the initial argon isotopic ratio is 297.1±2.0 (2σ) which is the same as the atmospheric argon at the 2σ error level. Study indicates that it is a useful means to date young volcanic groundmass with low K content by using CO_2 laser step-heating ~(40)Ar/~(39)Ar method.
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| 关 键 词： | 二氧化碳激光步式加热 玄武岩基质 岩石学 火山岩 |
| 收稿时间： | 2005-09-29 |
| 修稿时间： | 2005-09-292005-11-28 |
Laser step-heating 40Ar/39Ar dating on young volcanic rocks |
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| WANG Fei HE Huaiyu ZHU Rixiang YANG Liekun SANG Haiqing WANG Yinglan.Laser step-heating ^40Ar/^39Ar dating on young volcanic rocks[J].Chinese Science Bulletin,2006,51(23):2892-2896. |
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| Authors: | Fei Wang Huaiyu He Rixiang Zhu Liekun Yang Haiqing Sang Yinglan Wang |
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| Institution: | (1) Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China |
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| Abstract: | An attempt was made to use CO2 laser step-heating method to date the late Pleistocene basaltic groundmass (DF-2) from Tengchong volcanic field. Among the
fourteen heating steps, ten define a good inverse isochron (MSWD = 1.4) with an age of 32.2 ± 7.1 ka (2 σ). The inverse isochron
also shows that the initial argon isotopic ratio is 297.1±2.0 (2σ) which is the same as the atmospheric argon at the 2σ error
level. Study indicates that it is a useful means to date young volcanic groundmass with low K content by using CO2 laser step-heating 40Ar/39Ar method. |
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| Keywords: | CO_2 laser step-heating young basaltic groundmass ~(40)Ar/~(39)Ar dating |
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