胶莱盆地青岛地区恐龙蛋地球化学特征及其意义  

Geochemical Characteristics and Significance of Dinosaur Eggs in Qingdao Area of Jiaolai Basin

作　　者：王丽娟[1] 任天龙[1] 黄永波[1] 朱学强[1] 张贵丽[1] 张学松[1] WANG Lijuan;REN Tianlong;HUANG Yongbo;ZHU Xueqiang;ZHANG Guili;ZHANG Xuesong(Shandong Institute of Geological Surveying,Shandong Ji'nan 250013,China)

机构地区：[1]山东省地质调查院,山东济南250013

出　　处：《山东国土资源》2024年第10期18-25,共8页Shandong Land and Resources

基　　金：山东省自然资源厅省级地质勘查项目“胶莱盆地中部白垩纪古生物化石调查研究及保护”(鲁勘字〔2019〕54号);“山东省1∶5万夏格庄、灵山幅区域地质调查”(鲁勘字〔2015〕1号)。

摘　　要：胶莱盆地青岛地区恐龙蛋化石丰富,本文通过对莱西、胶州两地恐龙蛋壳及围岩地球化学特征进行对比分析,探讨恐龙生存环境的古气候特征及其灭亡的地球化学指示。莱西、胶州地区恐龙蛋化石CaO含量51.7%~54.6%,SiO_(2)含量为0.27%~3.31%,Al_(2)O_(3)含量为0.14%~0.88%,MgO含量为0.36%~0.71%,Na_(2)O含量为0.04%~0.14%,矿物成分以碳酸盐为主;稀土元素总量∑REE为(5.87~117.99)×10^(-6),∑LREE为(5.10~97.28)×10^(-6),∑HREE为(0.77~20.71)×10^(-6),∑LREE/∑HREE为3.97~6.65,为轻稀土富集型,在配分曲线上呈右倾双“V”型曲线,Ce、Eu元素具有明显的负异常;在微量元素蛛网图上,富集大离子亲石元素Rb、Sr、Ba,亏损高场强元素Nb、Zr、Hf、Ti。通过与围岩元素含量分析比较,胶莱盆地恐龙生活环境以干旱为主,间有湿润。恐龙蛋表现为Sr、Ba、Y元素的富集,Ce元素的亏损,这些元素不利于恐龙产蛋及蛋的孵化,对恐龙的繁衍、生存有重要影响。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 content of CaO in the dinosaur egg fossils in Laixi area and Jiaozhou area is 51.7%~54.6%,the content of SiO_(2) is 0.27%~3.31%,the content of Al_(2)O_(3) is 0.14%~0.88%,the content of MgO is 0.36%~0.71%,and the content of Na_(2)O 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 anomalies.In the trace element spider diagram,the large ion lithophile elements Rb,Sr,Ba are enrichment,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 Jiaolai basin lived in a dry environment,with intermittent humid.In addition,the dinosaur eggs show an enrichment 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.

关 键 词：恐龙蛋 地球化学特征 胶莱盆地 青岛地区 

分 类 号：Q915.2[天文地球—古生物学与地层学]