Laser 40Ar/39Ar Dating of the Siliceous Rocks in North Xinjiang
详细信息
- 责任者：Tu Jiyao (Laboratory of Orogenic Belts and Crustal Evolution ; School of Earth and Space Sciences ; Peking University ; Beijing 100871 ; China) ; Ji Jianqing
- 刊名：Acta Petrologica Sinica
- 出版年：2013
- 卷期：29(8)
- 关键词：硅质岩 ; silicolite ; 氩—氩计时 ; Ar-Ar dating ; 准噶尔盆地 ; Junggar Basin
- 页码：p.2796-2802
- 图表：3 illus., 2 tables, 19 refs.
- 分类号：0803
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
ary" name="EnDivSummary">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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