| 40Ar/39Ar同位素体系及其在地学上的应用 |
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| 引用本文： | 谭绿贵,周涛发,袁峰.40Ar/39Ar同位素体系及其在地学上的应用[J].合肥工业大学学报(自然科学版),2004,27(12):1509-1514. |
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| 作者姓名： | 谭绿贵 周涛发 袁峰 |
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| 作者单位： | 合肥工业大学,资源与环境工程学院,安徽,合肥,230009;皖西学院,地理与环境科学系,安徽,六安,237012;合肥工业大学,资源与环境工程学院,安徽,合肥,230009 |
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| 基金项目： | 国家重点基础研究发展规划资助项目(2001CB409810-11);国家自然科学基金资助项目(40272048)和安徽省优秀青年科技基金资助项目(04045063) |
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| 摘 要： | 40Ar/39Ar同位素体系大体经历了3个技术阶段常规 40Ar/39Ar定年技术、40Ar/39Ar分步加热定年技术和40Ar/39Ar激光显微探针定年技术.研究表明可以通过大气中40Ar/39Ar比值随时间的变化窥探地球去气作用的时间和强度;40Ar/39Ar法不仅有助于研究岩浆冷却过程和花岗岩侵位机制等岩浆动力学的历史和壳幔演化,而且对研究热液成矿年龄也是很有效方法之一;在一定的地质条件下,沉积地层时代越老,40Ar/39Ar值越高;当今40Ar/39Ar年代法已为全球环境演变研究提供了一种强有力的工具.
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| 关 键 词： | 40Ar/39Ar法 同位素体系 地质年代学 地学应用 |
| 文章编号： | 1003-5060(2004)12-1509-06 |
| 修稿时间： | 2004年5月17日 |
Fast neutron activation method based on the 40Ar/39Ar isotopic system and its application in geosciences |
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| TAN Lu-gui.Fast neutron activation method based on the 40Ar/39Ar isotopic system and its application in geosciences[J].Journal of Hefei University of Technology(Natural Science),2004,27(12):1509-1514. |
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| Authors: | TAN Lu-gui |
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| Institution: | TAN Lu-gui~ |
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| Abstract: | The fast neutron activation method based on the~~(40)Ar/~(39)Ar isotopic system has roughly undergone three technological stages which are characterized by the conventional~(40)Ar/~~(39)Ar dating method, the (~(40)Ar/~(39)Ar) step-heating dating method,and the laser microprobe ~(40)Ar/~(39)Ar dating method,respectively. The ~(40)Ar/~(39)Ar geochronologic study indicates that with the ratio ~(40)Ar/~(39)Ar in atmosphere which changes with time,the time and strength of degassing of the earth can be probed,and that the (~(40)Ar/~(39)Ar) dating method can help researchers study not only crust-mantle evolution and the history of magma dynamics during the cooling process and granitoid emplacing, but also the hydrothermal ore deposit dating. In some cases of geology, the elder the deposit layer age,the greater the ratio(~(40)Ar/~(39)Ar). It is thought that the ~(40)Ar/~(39)Ar chronology will become a powerful tool for the study of the global environmental changes. |
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| Keywords: | ~(40)Ar/~(39)Ar fast neutron activation method isotopic system geochronology application in geoscience |
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