四川广元恐龙化石的微量元素组合特征及其意义

CHARACTERISTICS AND SIGNIFICANCE OF THE TRACE ELEMENTS COMPOSITION IN THE DINOSAUR FOSSILS FROM GUANGYUAN,SICHUAN

应用中子活化分析（ＩＮＡＡ）技术对四川广元河西晚侏罗世恐龙骨骼化石及围岩的微量元素成分及含量进行了测定和研究。结果表明，恐龙骨骼化石中稀土元素（ＲＥＥ）、铀（Ｕ）、砷（Ａｓ）、钡（Ｂａ）等微量元素显示了高或极高异常，锌（Ｚｎ）却显示了低异常；而化石围岩的微量元素极大多数都无明显的异常。根据这些微量元素的组合特征，对该动物群的集群死亡原因作了初步的探讨。

INAA technique has been applied to determine composition of the trace elements in the dinosaur fossils from the Upper Jurassic of Guangyuan,Sichuan,in this paper.The research shows that REE,U,As and Ba present a very high anomaly,and Zn a low anomaly in composition,but these trace elements in the country rocks are normal.This evidence indicates that the mass death of this dinosaur fauna may be in close relationship with the extremely high contents As and Ba,and low contents Zn