ABNORMAL MICROSTRUCTURE AND CHEMICAL COMPONENTS IN THE FOSSIL DINOSAURIAN EGG SHELLS FROM THE K-T BOUNDARY

K-T边界恐龙蛋壳化石的异常微观结构和化学成分

• 批准号: 14540424
• 负责人: KAMIYA Hidetoshi
• 金额: $ 2.05万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540424/
• 关键词: dinosaur; egg shell; extinction; fossil; Mesozoic; microstructure; abnormal texture; meteorites; 爬虫類; 卵殻化石; 硬組織; 歯化石; エナメル質; 生鉱物; 微細構造

It is well known that dinosaurs lived around the world in Mesozoic Era extinct suddenly at the end of Cretaceous Period, and instead of them Mammals made big distribution in Cenozoic. Study on the reason of extinction of dinosaurs is very big and important problems not only in paleontology but also in the whole field of the earth science. In this study, we tried to get a new data concerning the great extinction in the end of the Mesozoic by the observation of the fossil egg shells of dinosaurs found in inner Mongolia, China and Mongolia under the light microscope and scanning electron microscope.The brief summary of this research is described in the fllowings;(1)Internal texture of the fossil dinosaurian egg shells investigated consists of the basic unit called "Mammila" as well as the recent avian egg shells and dinosaurian egg shells studied until now.(2)The microstructure of the egg shells correspond to the differences of the egg shape difference (kind of the eggs).(3)The shell layer is composed of calcite mainly and fine original textures are still preserved. It means that these materials have not been influenced so strongly by the diagenetic alteration. Chemical components must be investigated further more.

众所周知，中生代生活在世界各地的恐龙在白垩纪末期突然灭绝，取而代之的是哺乳动物在新生代大量分布。恐龙灭绝原因的研究不仅是古生物学界而且是整个地球科学领域的重大问题。本研究试图通过光学显微镜和扫描电镜对中国内蒙古和蒙古国发现的恐龙蛋壳化石进行观察，试图获得有关中生代末大灭绝的新数据。 被称为“Mammila”的蛋壳以及迄今为止研究的最新鸟类蛋壳和恐龙蛋壳。（2）蛋壳的微观结构与蛋形差异（蛋的种类）的差异相对应。（3）蛋壳层主要由方解石组成，仍保留着精细的原始纹理。这意味着这些物质并未受到成岩蚀变的强烈影响。必须进一步研究化学成分。

项目成果

Kamiya, H., Kato, K.: "Comparison of enamel texture of fossil elephant molars from Japan and its neighbors"Pacific Neogene Paleoenvironments and their Evolution. 8. 121-125 (2003)

Kamiya, H., Kato, K.：“日本及其邻国大象臼齿化石牙釉质纹理的比较”太平洋新近纪古环境及其演化。

Komatsu, T., Chinzei, K., Zakhera M.S., Matsuoka: "Jurassicsoft-bottom oyster Crassostrea from Japan"Palaeontology. 45(6). 1037-1048 (2002)

Komatsu, T.、Chinzei, K.、Zakhera M.S.、Matsuoka：“来自日本的侏罗纪软底牡蛎 Crassostrea”古生物学。

Matsuoka, H, Okazaki, Y., Hasegawa Y.: "Vertebrata"Hirano and Ogasawara ed., The database of Japanese fossil type spepimensdescribed during the 20th Century (Part 3). 328-335 (2003)

松冈 H、冈崎 Y.、长谷川 Y.：“脊椎动物”Hirano 和 Ogasawara 编辑，20 世纪描述的日本化石类型标本数据库（第 3 部分）。

Barrett, P.M., Hasegawa, Y., Manabe, M., Matsuoka, H.: "Souropod teeth from the Kuwajima Formation (Lower Cretaceous) of Ishikawa Prefecture, Japan"Palaeontology. 45(6). 1197-1217 (2002)

Barrett, P.M.、Hasekawa, Y.、Manabe, M.、Matsuoka, H.：“来自日本石川县桑岛组（下白垩纪）的蜥脚类动物牙齿”古生物学。

Kamiya, H., Kato, K.: "Comparison of Enamel Texture in the Recent and Fossil Modern Elephants, evolved Proboscidea"Proceedings of the 8^<th> International Symposium on Biomineralization. 1. 85-87 (2004)

Kamiya, H.、Kato, K.：“近代大象和化石现代大象（进化长鼻动物）牙釉质纹理的比较”第八届国际生物矿化研讨会论文集。