中文摘要：

利用古土壤钙质结核同位素恢复古大气CO2浓度是古气候研究的重要手段，对胶莱盆地赭埠剖面晚白垩世辛格庄组顶部发育的古土壤钙质结核进行碳、氧同位素分析表明，其δ^13C值在-2．87‰～-1．6‰之间，平均值为-2．13‰；δ^18O值在-11．93‰～-7．79‰之间，平均值为-9．87‰。计算得出晚白垩世Campanian早期大气C02浓度在3116×10^-6～4437×10^-6之间，平均3817×10^-6.对比前人研究成果，认为在80Ma左右存在一次明显的大气CO2浓度高值现象。这也为研究胶莱盆地晚白垩世恐龙动物群的古生态环境提供重要依据。

英文摘要：

Isotopes of pedogenic carbon nodules are effective means to reconstruct atmosphere CO2 partial pressure. Stable carbon and oxygen isotopic analysis of carbonate nodules in Late Cretaceous Xingezhuang Formation,in Jiaozhou-Laiyang basin have been carried out. The carbon isotope compositions range from - 2.87‰ to - 1.6‰ （PDB）, with an average of - 2.13‰ and the oxygen isotope compositions range from -11.93‰ to -7.79‰ （PDB）, with an average of -9.87‰. The CO2 partial pressure calculated in early Campanian range from 3 116 ×10^-6 -4 437 × 10^-6 ,with an average of 3 817 × 10^-6. Compared with former research, a marked high value of CO2 partial pressure occur in about 80 Ma, which provides important information for study of paleo-environment of dinosaur living period in Jiaozhou-Laiyang basin.