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辽西建昌玲珑塔地区侏罗纪地层的离子探针锆石U-Pb定年:对最古老带羽毛恐龙的年代制约
SIMS U-Pb zircon age of Jurassic sediments in Linglongta, Jianchang, western Liaoning: Constraint on the age of oldest feathered dinosaurs
【摘要】 辽西建昌玲珑塔地区髫髻山组火山-沉积岩地层中富含燕辽生物群(又称道虎沟生物群)的重要化石,并记录了若干重要的生物演化事件,特别是对研究鸟类的起源以及最早鸟类和恐龙祖先的分化均具有关键的意义,因而其地层时代问题备受关注.本文对建昌玲珑塔大西山含化石沉积层中的3个凝灰岩样品进行了详细的SIMS锆石U-Pb定年,获得了160.7±1.7,159.5±2.3和158.9±1.7Ma的年龄结果.根据近年广泛使用的地质年表GTS2004和新近修订的地质年表GTS2012,由侏罗兽和近鸟龙等构成的燕辽生物群生存于晚侏罗世早期,从而为最早哺乳动物和最早带毛恐龙的出现年代提供了确凿的同位素年代学证据.
【Abstract】 Mesozoic fossil locality in Linglongta village, Jianchang County, western Liaoning,has drawn extensive attention among paleontologists as producing hundreds of beautifully preserved feathered dinosaurs and mammals. The SIMS U-Pb zircon analyses of zircons derived from three tuff layers in Daxishan section in Linglongta yield (160.7±1.7), (159.5±2.3) and (158.9±1.7) Ma, indicating that they were formed at early Late Jurassic. Such a result is generally consistent with biostratigraphic evidence, providing a maximum known age for the first appearance of feathered dinosaurs.
【Key words】 Jianchang Linglongta; Late Jurassic; U-Pb dating; feathered dinosaurs;
- 【文献出处】 科学通报 ,Chinese Science Bulletin , 编辑部邮箱 ,2013年14期
- 【分类号】Q915
- 【被引频次】26
- 【下载频次】341