摘要
利用显微镜和碳同位素分析法对采自河南西峡盆地晚白垩世的16枚恐龙蛋化石进行了研究。在显微镜下观察到恐龙蛋化石壳由原生碳酸盐矿物和次生碳酸盐矿物两部分组成。利用图像分析法得到了两者所占的比例分别为60.5％和39.5％。恐龙蛋内充填的次生碳酸盐矿物的δ13C值在－5.63‰～－5.68‰之间，平均为－5.65‰。恐龙蛋化石壳的δ13C同位素值在－5.88‰～－7.79‰之间。经计算，获得了恐龙蛋壳的原生碳酸盐δ13C值为－6.03‰～－9.19‰。由此计算出恐龙的食物来源是以C3植物为主(61％)，其次是C4植物(39％)，并推断出晚白垩世西峡盆地的古气候为半湿润、半干旱、低纬度的亚热带气候区。
A study of 16 dinosaur eggshell fossils in the Late Cretaceous from Xixia Basin, Henan Province, using microscopic and carbon isotope method has been made. The careful observation under microscopy has revealed that all the dinosaur eggshell fossils consist of primary calcite and secondary calcite, and the former is about 60.5％ and the latter about 39.5％ by the method of image analysis. The analysis of the secondary carbonate mineral filling within the dinosaur in the strata demonstrates that the δ 13C values of them ranges from － 5.63‰ to － 5.68‰ , averaging is － 5.65‰ . The δ 13C values of the sixteen dinosaur eggshell fossils are in the range of － 5.88‰ to By calculation, the δ 13C values of the primary carbonate minerals are obtained, ranging from － 6.03％ to － 9.19‰ . Based on the δ 13C of the primary carbonate, the ancient food type and proportion of dinosaur are contrasted. The dinosaur s food proportion of C3 plant and C4 plant is 61％ and 39％ , respectively. It is inferred that the palaeoclimates in Xixia Basin should be assigned to warm and semihumidity and semiarid climate in the subtropical zone.
出处
《地球化学》
CAS
CSCD
北大核心
2000年第5期475-479,共5页
Geochimica
基金
石油大学科研基金
关键词
恐龙蛋
化石壳
碳同位素
古气候
西峡盆地
河南
dinosaur egg
eggshell fossil
carbon isotope
palaeoclimatology
Xixia Basin
Henan Province
