甘肃北山二道泉地区流纹岩LA-ICP-MS锆石U-Pb年龄及其地质意义
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摘要
为了研究甘肃北山二道泉地区古生代火山岩的年代学特征及其地质意义,对该地区流纹岩进行LA-ICP-MS锆石U-Pb同位素精确测年。锆石U-Pb同位素定年利用北京科荟测试技术有限公司的LA-ICP-MS同时分析完成,激光剥蚀系统为ESI NWR 193 nm,ICP-MS为AnalytikjenaPlasmaQuant MS Elite ICP-MS。用Isoplot软件完成锆石样品U-Pb年龄谐和图的绘制和年龄权重平均的计算。结果表明:在锆石U-Pb年龄谐和图中17个数据集中分布在谐和线附近,锆石~(206)Pb/~(238)U加权平均年龄为(282.5±1.7) Ma(MSWD=0.27),即该期流纹岩形成的地质时期为早二叠世。本次测年为北山造山带的认识提供了年龄依据,有助于了解该地区的地质构造演化。
In order to study the chronological characteristics and geological significance of the Paleozoic volcanic rocks in the Erdaoquan area of Beishan,Gansu,the LA-ICP-MS zircon U-Pb isotope was accurately measured for the rhyolite in the area.The zircon U-Pb isotope dating was completed by LA-ICP-MS of Beijing Keye Testing Technology Co.,Ltd.The laser ablation system was ESI NWR 193 nm and the ICP-MS was AnalytikjenaPlasmaQuant MS Elite ICP-MS.The U-Pb age harmonic map of zircon samples and the calculation of age weight average were performed using Isoplot software.The results show that the 17 data sets in the zircon U-Pb age harmonic map are distributed near the harmonic line,and the weighted average age of zircon ~(206)Pb/~(238)U is(282.5±1.7)Ma(MSWD=0.27),which is the rhyolite of this period.The geological period formed was Early Permian.This survey provides an age basis for the understanding of the Beishan orogenic belt and helps to understand the geological tectonic evolution of the area.
In order to study the chronological characteristics and geological significance of the Paleozoic volcanic rocks in the Erdaoquan area of Beishan,Gansu,the LA-ICP-MS zircon U-Pb isotope was accurately measured for the rhyolite in the area.The zircon U-Pb isotope dating was completed by LA-ICP-MS of Beijing Keye Testing Technology Co.,Ltd.The laser ablation system was ESI NWR 193 nm and the ICP-MS was AnalytikjenaPlasmaQuant MS Elite ICP-MS.The U-Pb age harmonic map of zircon samples and the calculation of age weight average were performed using Isoplot software.The results show that the 17 data sets in the zircon U-Pb age harmonic map are distributed near the harmonic line,and the weighted average age of zircon ~(206)Pb/~(238)U is(282.5±1.7)Ma(MSWD=0.27),which is the rhyolite of this period.The geological period formed was Early Permian.This survey provides an age basis for the understanding of the Beishan orogenic belt and helps to understand the geological tectonic evolution of the area.
引文
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[2] 杨建国,谢春林,王小红,等.甘肃北山地区基本构造格局和成矿系列特征[J].地质通报,2012,31(2/3):421-428.
[3] 惠卫东,朱江,邓杰,等.甘肃北山白山堂矿区流纹斑岩的U-Pb年代学、地球化学特征及其地质意义[J].地质与勘探,2013,49(3):484-496.
[4] 夏林圻,夏祖春,徐学义,等.天山及邻区石炭纪—早二叠世裂谷火山岩岩石成因[J].西北地质,2008,41(4):1-68.
[5] 牛亚卓,魏建设,史冀忠,等.甘肃北山地区北部上石炭统火山岩LA-ICP-MS锆石U-Pb年龄及其构造意义[J].地质通报,2013,32(11):1720-1727.
[6] 王玉往,姜福芝.北山地区各时代火山岩组合特征及分布[J].中国区域地质,1997,16(3):298-304.
[7] 陈玉良,康文彬,梅华平,等.甘肃北山北部红石山地区泥盆系雀儿山群火山岩地球化学特征及构造环境分析[J].西北地质,2015,48(4):51-60.
[8] 校培喜,由伟丰,董增产,等.甘肃北山小草湖火山岩系形成时代的重新厘定[J].地质通报,2010,29(9):1268-1274.
[9] LIU Y S,GAO S,HU Z C,et al.Continental and oceanic crust recycling-induced melt-peridotite interactions in the Trans-North China Orogen:U-Pb dating,Hf isotopes and trace elements in zircons from mantle xenoliths[J].Journal of Petrology,2010,51:537-571.
[10] 贾元琴,赵志雄,许海.北山风雷山地区白山组流纹岩LA -ICP-MS锆石U-Pb年龄及构造环境[J].中国地质,2016,43(1):91- 98.
[11] 赵泽辉,郭召杰,王毅.甘肃北山柳园地区花岗岩类的年代学、地球化学特征及构造意义[J].岩石学报,2007,23(8):1847- 1860.
[12] 段先锋,张雄华,卜建军.甘肃北山地区下石炭统红柳园组四射珊瑚动物群及其地质意义[J].地质科技情报,2011,30(6):13- 17.