New evidence for Cretaceous age of the feathered dinosaurs of Liaoning: zircon U-PbSHRIMP dating of the Yixian Formation in Sihetun, northeast China

作者：Yang Wei; Li Shuguang^*; Jiang Baoyu

来源：Cretaceous Research, 2007, 28(2): 177-182.

DOI：10.1016/j.cretres.2006.05.011

• zircon U-PbSHRIMP dating
• Yixian Formation
• feathered dinosaurs
• Liaoning
• Jehol Biota

We present the first report of U-Pb SHRIMP dating of zircons from three tuffs interbedded within the "feathered dinosaur" -bearing deposits in western Liaoning, China. One is a sample from the Bed 6 tuff (LX-SHT-12) of the Yixian Formation in Sihetun, for which our zircon U-Pb SHRIMP analyses gave a Cretaceous age (124.7 +/- 2.7Ma), in agreement with a previously published sanidine Ar-40/Ar-39 age (124.60 +/- 0.25 Ma). The othertwo are from the Bed 1 tuff (LX-HBJ-1) and Bed 8 tuff (LX-HBJ-6) of the Yixian Formation in Huangbanjigou; the former gave an age of 124.9 +/- 1.7 Ma, the latter an age of 122.8 +/- 1.6 Ma. The three consistent ages indicate that the Yixian Formation was deposited in the Early Cretaceous within a very short time period (ca. 2 Ma).

• 出版日期2007-4
• 单位南京大学; 中国科学技术大学