乌兰花地区下白垩统、上新统岩石地球化学特征及其古气候演变

Petrogeochemical characteristics of Lower Cretaceous and Pliocene rocks and paleoclimate evolution in Wulanhua region

在 1∶50万铀资源评价的基础上 ,本文运用岩石地球化学方法 ,分析了内蒙古四子王旗乌兰花地区下白垩统和上新统岩石形成的古环境和古气候条件 ,结果显示 ,早白垩世该区为温湿 半干旱气候 ,晚新世为干旱 半干旱气候 ,其地球化学指标 (常量元素、微量元素、稀土元素、有机质等 )

Based on 1∶500000 uranium resource evaluation ,a nd using petrogeochemical approach,this paper analyses the paleo-enviroments an d paleo-climatic conditions during the formation of Lower Cretaceous and Plioce ne r ocks in Wulanhua region,Siziwangqi,Inner Mongolia.Research results indicate,that the region was characterized by warm-moist to semiarid climate in Early Cretac eous, and arid to semiarid climate in Pliocene.Geochemical parameters of Lower C retaceous and Pliocene rocks show certain regular variation.