【作者】 陈孝红； 王传尚； 程龙；

【Author】 Chen Xiao-hong Wang Chuan-shang Cheng Long (Yichang Institute of Geology and Mineral Resources,Yichang,Hubei 443003)

【机构】 宜昌地质矿产研究所；

【摘要】 在系统介绍扬子地区三叠纪海生爬行动物分布、时代和组合特征基础上,结合海生爬行动物多样性特点及其与海平面变化、火山活动和古地理变化关系的讨论,分析和讨论了关岭生物群的起源与环境演化特点, 指出关岭生物群是古生代末期全球生物大绝灭之后,中生代早期海洋生物复苏和生态系统重新建立过程中,在扬子地台三叠纪浅海陆棚环境中的生物与环境协同演化发展所形成的,以海生爬行动物为特色,集多门类脊椎和无脊椎于一体的生物群落。该生物群落出现于二叠纪末期生物大绝灭之后,生物链和食物链被严重破坏以及生态空缺的早三叠世晚期,辐射发展于大陆环境恶劣、火山活动频繁的中三叠世安尼期,消亡于其对环境的适应和特化以及扬子台地整体抬升的晚三叠世。更多还原

【Abstract】 Based on the study of the distribution,age and the characteristics of the assemblage of Triassic marine reptiles of the Yangtze region,combined with the analysis of the relations on the diversification of marine reptiles with sea-level changes,volcanic activities and paleogeographical changes,this paper deals with the origin of the Guanling biota and its taphonomic evolution.It concludes that the Guanling biota,as a unique community characterized by marine reptiles to- gether with muti-taxa of vertebrate and invertebrate animals,took shape in the shelf environment of Yangtze platform by the mutual evolution of the biology and the environment during the period of recovery of marine environment and rebuil- ding of the ecosystem at the early Mesozoic Era after the global mass extinction at the end of Paleozoic Era.The commu- nity appeared in a vacant ecosystem during late Early Triassic when the bio-chain and food chain were destroyed severely after the mass extinction at the end of Permian;radiated during Late Anisian of Middle Triassic when the continental en- vironment was deteriorated and the volcanic activities happened very frequently;and died out during the Late Triassic when it adapted to the environment and specialized gradually with the rise of the whole Yangtze platform.更多还原