柴达木地块北缘全吉地块钾长石浅粒岩碎屑锆石LA-ICP-MSU-Pb定年——对达肯大坂岩群时代的约束

被引:53
作者
黄婉 [1 ]
张璐 [1 ,2 ]
巴金 [1 ,2 ]
廖梵汐 [1 ,2 ]
陈能松 [1 ,3 ]
机构
[1] 中国地质大学(武汉)地球科学学院
[2] 中国地质大学研究生院
[3] 中国地质大学/地质过程与矿产资源国家重点实验室
关键词
碎屑锆石; LA-ICP-MS锆石U-Pb定年; 达肯大坂岩群; 全吉地块;
D O I
暂无
中图分类号
P588.346 [];
学科分类号
摘要
为查明全吉地块基底中达肯大坂岩群的最大沉积年龄,用LA-ICP-MS技术测定了钾长石浅粒岩中的锆石U-Pb年龄。CL图像和Th/U比值指示这些锆石均为岩浆成因的锆石。36个测点207Pb/206Pb年龄变化范围为2094~2280Ma,其中年龄谐和度高于90%的30个测点的207Pb/206Pb年龄相对概率密度曲线呈单峰分布特征,峰值年龄为2190Ma左右。结合全吉地块最早一期变质事件的年龄,钾长石浅粒岩原岩碎屑和所在的达肯大坂岩群的沉积年龄范围被约束在1.95~2.19Ga之间。本研究表明,前人在侵入于达肯大坂岩群的伟晶岩脉中获得的约2.42Ga年龄的锆石应捕获于围岩,属于继承性岩浆碎屑成因,该类锆石年龄不能用来约束达肯大坂岩群原岩的最小沉积年龄。
引用
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页码:1353 / 1359
页数:7
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