胶莱盆地青岛地区恐龙蛋地球化学特征及其意义OA

There are abundant dinosaur egg fossils in Qingdao area of Jiaolai basin.In this paper,through comparison and analysis on geochemical characteristics of dinosaur eggshells and surrounding rocks in Laixi area and Jiaozhou area,the survival environment and extinction of dinosaurs have been discussed.The con-tent of CaO in the dinosaur egg fossils in Laixi area and Jiaozhou area is 51.7％～54.6％,the content of SiO2 is 0.27％～3.31％,the content of Al2O3 is 0.14％～0.88％,the content of MgO is 0.36％～0.71％,and the content of Na2O is 0.04％～0.14％.The mineral composition is dominated by carbonate.The total amount of rare earth elements ∑REE is(5.87～117.99)× 10-6,∑LREE is(5.10～97.28)× 10-6,∑HREE is(0.77～20.71)× 10-6,∑LREE/∑HREE is 3.97～6.65,which is light rare earth enrichment type.The partitioning curve shows a right-leaning double'V'curve,and Ce,Eu elements have obvious negative a-nomalies.In the trace element spider diagram,the large ion lithophile elements Rb,Sr,Ba are enrich-ment,high field strength elements Nb,Zr,Hf,Ti are loss.Comparing with the analysis of the element content of the surrounding rock,the living environment of the dinosaurs in Jiaolai basin is mainly dry and humid.Comparing with the analysis of the element content of the surrounding rock,the dinosaurs in Jia-olai basin lived in a dry environment,with intermittent humid.In addition,the dinosaur eggs show an en-richment of Sr,Ba and Y elements,and a deficit of Ce element,which are not favorable to the laying and hatching of the eggs,and have an important effect on the reproduction and survival of the dinosaurs.