论文部分内容阅读
通过对汝阳盆地郝岭和曹家沟早白垩统含恐龙化石地层岩性特征描述,以及环境地球化学样品采集和有机碳质量分数、稳定同位素组成、有机碳同位素组成等分析,结果表明研究区地层古环境演变与全球阿普特阶的古环境演变极具相似性.阿普特阶早期气候干旱、中期发生较强的降温过程,恐龙在早-中期的干旱和中期的降温事件中大量灭绝.恐龙化石层中有机质质量分数较低,无机和有机碳同位素组成均有偏重的趋势,代表了该段时期气候干旱少雨、植被不发育的古环境特征,食物的短缺及明显的降温可能是造成恐龙大量灭绝的直接原因之一.
Through the lithologic characterization of the Early Cretaceous dinosaur fossil strata in HaoLing and CaoJiaogou in the Ruyang basin and the analysis of environmental geochemical samples and organic carbon mass fraction, stable isotopic compositions and organic carbon isotopic compositions, the results show that the study area The evolution of the paleo-environment of the strata is very similar to the paleoenvironmental evolution of the global Aptelevel.The climate of Early Aptelemy was arid, with a strong cooling process in the mid-term, and the dinosaurs were massively extinct during the early-mid-term drought and mid-term cooling events The dinosaur fossil layer has lower organic matter mass fraction and more inorganic and organic carbon isotopic composition, representing the paleoenvironmental features of aridity and lack of vegetation during this period, which may result from food shortage and obvious cooling One of the direct causes of the massive extinction of dinosaurs.