摘要
对新疆西准噶尔盆地萨吾尔地区卡拉岗组3个火山岩样品(英安岩、玄武岩和流纹岩)进行了40Ar-39Ar精确测年,获得英安岩坪年龄为283±2Ma(2σ),玄武岩加权平均年龄为281·2±3·0Ma(2σ),流纹岩坪年龄为280±2Ma(2σ),因此确定该组火山岩形成于距今283~280Ma,为早二叠世亚丁斯克期火山活动的产物。
The dating of three samples from the Kalagang Formation volcanic rocks in Sawu'er region, western Junggar, Xinjiang, yielded an ^40Ar-^39Ar plateau age 283 ± 2 Ma(2σ, dacite), ^40Ar-^39Ar weighted mean age 281.2 ± 3.0 Ma(2σ, basalt), and ^40Ar-^39Ar plateau age 280 ± 2 Ma(2σ, rhyolite) , respectively. The ^40Ar-^39Ar chronology indicated that the volcanic rocks ernpted 283 - 280 Ma ago, which was product of Early Permian (Artinskian) volcanic activities.
出处
《地质科学》
CAS
CSCD
北大核心
2007年第3期579-586,共8页
Chinese Journal of Geology(Scientia Geologica Sinica)
基金
国家重点基础研究发展规划项目(编号:2001CB409800)
安徽省优秀青年科技基金项目(编号:04045063)资助