CAJ | 학술논문

安徽巢湖马家山剖面下三叠统南陵湖组中段上部-上段下部第598-630自然层中产出早三叠世巢湖龙动物群化石。通过对赋存巢湖龙动物群化石的第598-630自然层的微相类型和稳定碳氧同位素进行分析，揭示了该时期的沉积环境及其变化。在该段地层中共识别出4种微相类型，分别是红色-灰色瘤状厚层含骨针-双壳类生屑泥晶灰岩、灰色含生屑泥质泥晶灰岩、青灰色纹层状泥质泥晶灰岩和浅灰色含泥质泥晶灰岩，反映当时沉积环境从早到晚由外缓坡脚-深海盆地边缘渐变为外缓坡环境。稳定碳氧同位素分析表明，该段地层中δ13C值与δ18O 值普遍偏低。综合微相、沉积相及稳定碳氧同位素特征，推断巢湖龙动物群生活在安静的外缓坡环境中，伴生的生物种类及数量相对比较稀少，海水温度总体偏高。
안휘소호마가산부면하삼첩통남릉호조중단상부-상단하부제598-630자연층중산출조삼첩세소호룡동물군화석。통과대부존소호룡동물군화석적제598-630자연층적미상류형화은정탄양동위소진행분석，게시료해시기적침적배경급기변화。재해단지층중공식별출4충미상류형，분별시홍색-회색류상후층함골침-쌍각류생설니정회암、회색함생설니질니정회암、청회색문층상니질니정회암화천회색함니질니정회암，반영당시침적배경종조도만유외완파각-심해분지변연점변위외완파배경。은정탄양동위소분석표명，해단지층중δ13C치여δ18O 치보편편저。종합미상、침적상급은정탄양동위소특정，추단소호룡동물군생활재안정적외완파배경중，반생적생물충류급수량상대비교희소，해수온도총체편고。
The Early Triassic Chaohusaurus fauna was found at No.598-630 layers at the top of the Middle Member-the bottom of the Upper Member of the Nanlinghu Formation in Majiashan section of Cha-ohu area,Anhui Province.Based on the microfacies characteristics and the carbon and oxygen isotope a-nalysis,the sedimentary environment of the fossil beds where the Chaohusaurus fauna had occurred was studied.4microfacies types were recognized from the studied layers,which contained the red-grey thick nodular limestone with spicules-bivalves,the gray bioclastic-argillaceous micrite limestone,the gray lam-inated argillaceous micrite limestone,and the light gray micrite limestone,respectively.It was indicated that the sedimentary environment of the fossil beds was from the foot of the outer ramp-abyssal basin to the outer ramp.The values of the δ13C and δ18O are generally low in the whole of fossil beds.Combined with the above characteristics,it might be inferred that the Chaohusaurus fauna was living in the outer ramp zone with low-energy,less numbers and types of the biocoenose,and high seawater temperature.