皖南上溪群中的虫牙类和疑源类化石及其地质意义

FOSSILS OF SCOLECODONT AND ACRITARCH FROM SHANGXI GROUP IN SOUTHERN ANHUI AND THEIR GEOLOGICAL SIGNIFICANCE

陈冠宝 尹磊明 徐树桐

Chen Guanbao Yin Leiming Xu Shutong

"江南古陆"东北端上溪群中,发现了虫牙类化石和疑源类化石组合,为这套地层的准确定时,提供了直接证据.经鉴定,这一化石及化石组合的时代为寒武-奥陶纪,而不是以往所认为的中元古代.这些化石的发现说明依据岩体同位素年龄确定围岩年龄具有不确定性,另外,这一发现对研究该区的构造演化史具有重要意义.

Whether the distributive province of Shangxi Group metamorphosed strata in southern Anhui is an old land or an orogenic belt is quite controversial by geologists, but the age of the metamorphosed strata is very important to solve this problem. The scolecodonts and acritarchs reported here are new discoveries . They provide a direct evidence to the recognition of their ages and in the meantime some problems about the country rock ages determinated by the isotopic ages of intrusive bodies are presented. This discovery possesses important significance in the study of tectonic evolution of this area.

10.11743/ogg20010204