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Bulletin de la Societe Geologique de France; September 2007; v. 178; no. 5; p. 399-409; DOI: 10.2113/gssgfbull.178.5.399
© 2007 Societe Geologique de France
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Microphytoplankton diversity curves of the Chinese Ordovician

Jun Li1, Thomas Servais2, Kui Yan1 and Wenbo Su3

1 Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, 210008 Nanjing. China. E-mail : junli{at}nigpas.ac.cn, kyyan{at}163.com
2 Laboratoire de Paléontologie et de Paléogéographie du Paléozoïque, UMR 8014 CNRS, SN5, Université de Lille 1, F-59655 Villeneuve d’Ascq cedex, France. E-mail : Thomas.Servais{at}univ-lille1.fr
3 School of Earth Sciences and Ressources, China University of Geosciences, 100083 Bejing. China. E-mail : suwenbo{at}cugb.edu.cn

Following the publication of a regional diversity curve of the Ordovician organic-walled microphytoplankton (acritarchs) from the Yangtze Platform at the species level [Servais et al., 2004], a diversity curve for China is here presented using all literature data at the generic level. The Chinese curve is a compilation of three separate curves from the three major continental blocks that constituted China in the Ordovician: South China (including the Yangtze Platform), Tarim and North China. The diversity changes can partly be related to sea level changes, both at a regional (South Chinese sea level curve) and at a global level (global curve). The totalised curve for all Chinese localities indicates peaks in diversity that apparently correspond to three sea level highstands at a global level at the early-middle Ordovician boundary (middle "Arenigian"), at the Sandbian-Katian boundary (middle "Caradocian") and during the Upper Katian (pre-Hirnantian "Ashgillian") Boda Event [Fortey and Cocks, 2005].

Key Words: Acritarchs • Ordovician • China • Sea level change






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