期刊
ALCHERINGA
卷 34, 期 1, 页码 75-86出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/03115510903343501
关键词
conodont biodiversity; Zitai Formation; Floian; Dapingian; Ordovician; Anhui; East China
类别
资金
- Chinese Academy of Sciences [KZCX2-YW-Q05-01]
- Ministry of Science and Technology of China [2006FY20300-5, 2006CB806402]
- National Natural Science Foundation of China [40825006]
The Lower-Middle Ordovician Zitai Formation of the South China palaeoplate consists of a succession of purple red, nodular argillaceous limestones. Palaeogeographically, it is distributed along the southeastern margin of the Yangtze Platform, and is of late Floian to Dapingian age, correlative with the Dawan Formation of the Middle and Lower Yangtze Platform. In Shitai County, Anhui Province, East China, the Zitai Formation is rich in conodonts, enabling the recognition of four biozones based on first appearance data. Detailed palaeontological and biostratigraphical study of these conodonts reveals that the Ordovician conodont radiation in the Lower Yangtze Platform attained its first diversity peak low in the Oepikodus evae Biozone. This diversification is generally consistent with macroevolutionary trends of brachiopods of South China and graptolites of the Upper Yangtze Platform, but was earlier than that of trilobites and acritarchs of the same palaeoplate. Correlation with the sea-level curve for South China suggests that conodont diversity change during the Ordovician radiation was mainly controlled by regional sea-level fluctuations.
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