江西省赣州市章贡区晚白垩世莲荷组恐龙蛋化石显微结构及古环境意义  

Microstructure and Paleoenvironmental Significance of Dinosaur Egg Fossils from the Late Cretaceous Lianhe Formation in Zhanggong District,Ganzhou City,Jiangxi Province

作　　者：黎敬 时国[1] 楼法生 杨玲 许梦园 于娟 LI Jing;SHI Guo;LOU Fasheng;YANG Ling;XU Mengyuan;YU Juan(School of Earth Sciences,East China University of Technology,Nanchang,Jiangxi 330013,China;Jiangxi Geological Survey and Exploration Institute,Nanchang,Jiangxi 330025,China;Jiangxi Geological Museum,Nanchang,Jiangxi 330002,China)

机构地区：[1]东华理工大学地球科学学院,江西南昌330013 [2]江西省地质调查勘查院,江西南昌330025 [3]江西省地质博物馆,江西南昌330002

出　　处：《现代地质》2025年第2期350-360,共11页Geoscience

基　　金：国家自然科学基金项目(42062002)。

摘　　要：赣州作为我国最重要的晚白垩世恐龙蛋化石产地,其化石记录对揭示恐龙繁殖行为与古环境演变具有独特价值。本研究通过多尺度分析(偏光显微镜、扫描电镜及沉积学)对章贡地区莲荷组(K_(2)l)新发现恐龙蛋化石展开系统研究。结果表明:(1)蛋体外观呈长条状,长径为165~184 mm(均值174 mm),赤道直径为65~79 mm(均值73 mm),蛋身纹饰呈棱脊状,蛋壳柱状层与锥体层厚度之比在6:1左右,确认为大长形蛋(Elongatoolithus magnus);(2)在扫描电镜下,锥体层整体保存完整、排列整齐,内部较为致密,乳突间隙较小,说明该窝恐龙蛋应处于胚胎孵化的初期;柱状层主要发育垂向微气孔,有利于气体和水分的交换。在柱状层之上有一层孔隙较大的疏松层,可以起到保护蛋壳的作用。蛋壳厚度偏大可能是受晚白垩世末期干旱-半干旱的气候条件影响;(3)根据含恐龙蛋地层岩性及构造,研究区属于冲积扇中-远端辫状河道沉积相,而从蛋窝的保存状态可知该窝蛋化石属于原地埋藏。As the most important late Cretaceous dinosaur egg fossil producing area in China,Ganzhou's fossil record has unique value in revealing dinosaur breeding behavior and paleoenvironmental evolution.In this study,multi-scale analysis(polarizing microscope,scanning electron microscope and sedimentology) was used to systematically study the newly discovered dinosaur egg fossils in the Lianhe Formation(K_2l) in Zhanggong area.The results showed that:(1) The egg body was elongated in appearance,with a long diameter of 165-184 mm(mean 174 mm) and an equatorial diameter of 65-79 mm(mean 73 mm).The egg body was ridged in shape,and the ratio of the thickness of the shell columnar layer to the pyramidal layer was about 6:1,which was confirmed as Elongatoolithus magnus.(2) Under the scanning electron microscope,the pyramidal layer was intact and neatly arranged,the interior was dense,and the mastoid space was small,indicating that the nest of dinosaur eggs should be in the early stage of embryo hatching.The columnar layer mainly develops vertical micro-pores,which is conducive to the exchange of gas and water.There is a loose layer with large pores on the columnar layer,which can protect the eggshell.The large eggshell thickness may be affected by the arid-semi-arid climatic conditions at the end of the Late Cretaceous.(3) According to the lithology and structure of the strata containing dinosaur eggs,the study area belongs to the sedimentary facies of the middle-distal braided channel of the alluvial fan,and from the preservation state of the egg nest,it can be seen that the egg fossils are buried in situ.

关 键 词：恐龙蛋 晚白垩世 蛋壳结构 超微特征 

分 类 号：P52[天文地球—古生物学与地层学]