Carbon isotope of dinosaur eggshell fossils in the Late Cretaceous from Xixia Basin: Its composition and significance
Carbon isotope of dinosaur eggshell fossils in the Late Cretaceous from Xixia Basin: Its composition and significance
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发表时间：
2000
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通讯作者：
Zhu Guang
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作者：
Zhu Guang
对河南西峡盆地晚白垩世的16个恐龙蛋壳化石进行了显微分析和碳同位素研究。显微镜下的仔细观察表明，所有的恐龙蛋壳化石都是由原生方解石和次生方解石组成的，图像分析方法表明，前者约占60.5%，后者约占39.5%。对恐龙体内次生碳酸盐矿物充填的分析表明，它们的δ13C值变化范围为-5.63~-5.68‰，平均为-5.65‰。16个恐龙蛋壳化石的δ~(13)C值在-5.88‰~(-1)之间，通过计算得到原生碳酸盐矿物的δ~(13)C值在-6.03~-9.19‰之间。根据原生碳酸盐的δ13C，对比了恐龙的远古食物类型和比例。恐龙S C3植物和C4植物的食物比例分别为61%和39%。据此推断，西峡盆地古气候属亚热带温暖半湿润、半干旱气候。
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.