摘要
华南地区众多埃迪卡拉纪—寒武纪特异埋藏化石库为解读生命和生态系统的演化提供了重要化石证据,其中宏体藻类产出数量多、分布广、形态多样,是该时期生态系统中不可忽视的组成部分。过去对华南宏体藻类的研究多集中于形态、分类和古生态方面,对于其不同时期的地理分布和多样性变化较少涉及。文中对华南埃迪卡拉纪—寒武纪特异埋藏化石库中的宏体藻类进行了总结和分析,结果发现:(1)至晚埃迪卡拉世,宏体藻类的古地理分布范围和属、种级多样性明显扩大和提高,在晚埃迪卡拉世第五期达到顶峰;(2)寒武纪纽芬兰世宏体藻类的地理分布范围和属、种级多样性均较低,至第二世则明显扩大和增加;(3)苗岭世之后,宏体藻类古地理分布大幅度缩小,但多样性显著升高并达到第二高峰,直到芙蓉世多样性又急剧下降。推测区域海水含氧量的增加可能是导致华南宏体藻类繁盛(属、种多样性高)的主要原因,适合宏体藻类保存的泥页岩的分布范围或出露面积则可能是影响宏体藻类古地理分布范围的重要因素。
Numerous Ediacaran-Cambrian Lagerst?tten in South China provide important fossil evidence for the understanding of early evolution of life and ecosystems.Macroalgae were abundant,widely distributed,diverse in morphology,and constituted an essential part of ecosystems during the Ediacaran-Cambrian.Previous investigations on the Ediacaran-Cambrian macroalgae in South China focused on morphology,classification and palaeoecology,while their geographical distribution and diversity changes have seldom been studied in detail.In this paper,we summarize the Ediacaran-Cambrian macroalgae from the Ediacaran-Cambrian Lagerst?tten of South China.The palaeogeographic distribution and genus/species diversity of macroalgae increased significantly from early to late Ediacaran,and reached the peak in the Age 5.The palaeogeographic distribution and genus/species diversity were extremely low during the Terreneuvian(Cambrian),and increased during the Epoch 2.Thereafter,the palaeogeographic range of macroalgae decreased in the Miaolingian-Furongian,and the genus/species diversity increased significantly and reached the second peak.The increase of regional marine oxygen level,which is suggested to be closely related with the availability of nutrient elements such as N and P,may be the main reason for the flourishing of macroalgae(high genus and species diversity),and the wide distribution of mud shale suitable for the fossilization of soft-bodied organisms might be an important factor controlling the geographic extension of the Ediacaran-Cambrian macroalgae in South China.
作者
李高榕
魏凡
丛培允
LI Gaorong;WEI Fan;CONG Peiyun(Institute of Palaeontology,Yunnan Key Laboratory for Palaeobiology,MEC International Joint Laboratory for Paleobiology and Paleoenvironment,Yunnan University,Kunming 650500,China;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《古地理学报》
CAS
CSCD
北大核心
2023年第2期451-470,共20页
Journal of Palaeogeography：Chinese Edition
基金
国家自然科学基金项目(编号:42062001,42072019)
现代古生物学和地层学国家重点实验室项目(中国科学院南京地质古生物研究所)(编号:193128)
云南大学“双一流”建设联合专项(编号:202201BF070001-016)
云南大学研究生科研创新项目(编号:KC-2222959)联合资助。
关键词
宏体藻类
时空分布
多样性
埃迪卡拉纪
寒武纪
华南
macroalgae
spatial-temporal distribution
diversity
Ediacaran
Cambrian
South China
