| 准噶尔盆地周边硅质岩激光40Ar/39Ar法定年 |
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| 引用本文： | 涂继耀,季建清,周晶,徐芹芹,龚俊峰.准噶尔盆地周边硅质岩激光40Ar/39Ar法定年[J].岩石学报,2013,29(8):2796-2802. |
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| 作者姓名： | 涂继耀 季建清 周晶 徐芹芹 龚俊峰 |
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| 作者单位： | 1. 北京大学地球与空间科学学院造山带与地壳演化教育部重点实验室,北京,100871
2. 中国科学院地质与地球物理研究所岩石圈演化国家重点实验室,北京,100029 |
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| 基金项目： | 本文受国家青年自然科学基金项目(41202159)资助. |
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| 摘 要： | 由于较低的钾元素含量以及过剩氩的存在,长期以来对硅质岩的40Ar/39Ar定年一直存在较大难度。近年来,由于仪器水平的不断提高,新实验技术和方法的应用,特别是激光全熔40Ar/39Ar定年技术的应用,40Ar/39Ar定年方法具有了足够高的测试精度和稳定的低本底水平,可以满足测试极低钾元素含量的硅质岩样品的要求。利用多组矿物颗粒测试数据计算等时线年龄的方法可以很好地去除过剩氩对硅质岩年龄的影响。本文利用激光全熔40Ar/39Ar定年方法对新疆准噶尔盆地边缘的两个硅质岩样品进行了定年研究。采自白碱滩地区的08BJT-3样品的年龄测试结果为294±14Ma,该年龄结果与硅质岩样品所处的晚石炭世地层沉积年代基本一致。采自卡拉麦里地区的KML-2样品的年龄测试结果为266±14Ma,该年龄结果与强烈变形改造硅质岩样品的卡拉麦里构造变形带活动年代十分一致,表明激光全熔40Ar/39Ar定年方法可以准确地对硅质岩进行定年。
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| 关 键 词： | 激光40Ar/39Ar定年 硅质岩 准噶尔盆地 |
| 收稿时间： | 2012/10/25 0:00:00 |
| 修稿时间： | 2013/2/22 0:00:00 |
Laser40Ar/39Ar dating of the siliceous rocks in North Xinjiang |
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| TU JiYao,JI JianQing,ZHOU Jing,XU QinQin and GONG JunFeng.Laser40Ar/39Ar dating of the siliceous rocks in North Xinjiang[J].Acta Petrologica Sinica,2013,29(8):2796-2802. |
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| Authors: | TU JiYao JI JianQing ZHOU Jing XU QinQin and GONG JunFeng |
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| Institution: | Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China |
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| Abstract: | In the past, it was difficult to get the accurate 40Ar/39Ar dating results of siliceous rocks with low potassium and high excess 40Ar content. In recent years, due to the improvement of instruments and the application of new techniques and methods, in particular, the application of laser 40Ar/39Ar dating method, 40Ar/39Ar dating method has both high enough precision and low enough background level to meet the requirements of getting precise age for siliceous rocks with low potassium. The method using data of multiple sets of mineral particles to calculate isochrone age can be adopted to eliminate the impact of excess 40Ar on the age of siliceous rocks. This paper use laser 40Ar/39Ar dating method to date two siliceous rocks collected from the edge of the Junggar Basin in north Xinjiang. The age of the sample 08BJT-3 collected from Baijiantan area is 294±14Ma. It is basically consistent with the depositional age of the Late Carboniferous strata which the siliceous rock sample lies in. The age of the sample KML-2 collected from Karamaili area is 266±14Ma. It is fully consistent with the activity age of the Karamaili fault zone which strongly transforms the siliceous rock sample. Both of these indicate that the laser 40Ar/39Ar dating method can accurately date the siliceous rocks. |
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| Keywords: | Laser 40Ar/39Ar dating Siliceous rocks Junggar Basin |
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