首页 | 本学科首页   官方微博 | 高级检索  
   检索      

黔东早—中寒武世凯里组疑源类组合及其界线意义
引用本文:杨瑞东,尹磊明.黔东早—中寒武世凯里组疑源类组合及其界线意义[J].微体古生物学报,2001,18(1):55-69.
作者姓名:杨瑞东  尹磊明
作者单位:1. 贵州工业大学资源与环境学院,
2. 中国科学院南京地质古生物研究所,
基金项目:本文为国家自然科学基金(No.40062001)、贵州工业大学博士启动基金和攀登专项(95-专-01)成果
摘    要:通过对台江八郎和丹寨两条剖面凯里组中疑源类化石的分析,研究,台江剖面产疑源类化石有17属35各(12未定种),其中以Leiosphaeridia,Synsphareidium,Cymatiosphaera,Pterospermella最为丰富,可划分为3个组合,即Cymatiosphaera cf.cristata-Fimbriaglomerella memebrancea组合,Cristallinium-Micrhystridium-Pterospermella组合和Dictyotidium-Granomarginata组合,丹寨平寨剖面凯里组所产疑源类化石有:13属21种(5未定种),同样划分为3个组合,即Leiosphaeridia-Tasmanites组合,Retisphaeridium-Micrhystridium tentatium组合和Baltisphaeridium-Bubomorpha hunjiangensis组合,本文对两条剖面中的凝源类化石的组成,相对含量做了详细的统计,发现在八郎剖面9-2层和平寨剖面3层疑源类的丰度,分异度开始发生明显的变化,表现由早寒武世向中寒武世疑源类组合面貌的转变,这一疑源类转变层位正好是与三叶虫划分的中,下寒武统界线的层位位置相一致,这充分表明疑源类化石可作为划分中,下寒武统的极有价值的微体生物化石证据。

关 键 词:疑源类组合  凯里组  贵州  早-中寒武世
修稿时间:2000年8月16日

ACRITARCH ASSEMBLAGES FROM THE EARLY - MIDDLE CAMBRIAN KAILI FORMATION OF EAST GUIZHOU PROVINCE AND BIOSTRATIGRAPHIC IMPLICATION
YANG Rui,dong.ACRITARCH ASSEMBLAGES FROM THE EARLY - MIDDLE CAMBRIAN KAILI FORMATION OF EAST GUIZHOU PROVINCE AND BIOSTRATIGRAPHIC IMPLICATION[J].Acta Micropalaeontologica Sinica,2001,18(1):55-69.
Authors:YANG Rui  dong
Abstract:Acritarch fossils from the Early Middle Cambrian Kaili Formation at both the Balang and Pingzhai sections, Guizhou Province, have been studied. seventeen genera and 35 species of acritarchs from the Kaili Formation of the Balang section have been identified, in which Leiosphaeridia, Synsphaeridium, Cymatiosphaera, Pterospermella are abundant. Three acritarch assemblages near the Early and the Middle Cambrian boundary have been established as follows (in ascending order): Cymatiosphaera cf. cristata Fimbriaglomerella membrancea assemblage; Cristallinium Micrhystridium Pterospermella assemblage; Dictyotidium Granomarginata assemblage. thirteen genera and 21 species of acritarchs from the Pingzhai section have been identified, and three acritarch assemblages have been established near the Early and the Middle Cambrian boundary, which are (in ascending order): Leiosphaeridia Tasmanites assemblage; Retisphaeridium Micrhystridium tentatium assemblage; Baltisphaeridium Bubomorpha hunjiangensis assemblage. A detailed study, concerning the relative abundance of major genera and the variation of acritarch abundance in each acritarch assemblage, has been conducted. The acritarch assemblages of the Kaili Formation are very well correlated with those from Lower and Middle Cambrian elsewhere in the world. It suggests that the boundary between the Early and the Middle Cambrian should be placed at the bottom of layer 9 2 in the Balang section in Taijiang. This boundary defined by the acritarch assemblages is consistent with the boundary marked by the appearance of trilobite Oryctocephalus indicus or the extinction of large number of species of Bathynotus, Redlichia, and Protoryctocephalus. Present study suggests that acritarch assemblages are of particular importance for the biostratigraphy correlation of Cambrian stratigraphy in the area where other index fossils are absent.
Keywords:acritarch assemblages  boundary  Early  Middle Cambrian  Kaili Formation  Guizhou
本文献已被 CNKI 维普 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号