Succession and global correlation of Late Tremadoc graptolite zones from South China |
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Authors: | HongZhen Feng Ming Li YuanDong Zhang Bernd-D Erdtmann LiXia Li and WenHui Wang |
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Institution: | (1) Department of Earth Sciences, Nanjing University, Nanjing, 210093, China;(2) Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China;(3) Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing, 210008, China;(4) Institut für Angewandte Geowissenschaften, Technische Universit?t Berlin, Berlin, D-10587, Germany |
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Abstract: | The Tremadocian is the first stage of the Ordovician System and is subdivided into two parts in general. The Upper Tremadocian,
spanning a temporal interval of ca. 8 Ma, yields graptolite faunas crucial for biostratigraphic division and correlation in
high resolution. Relatively complete successions of Upper Tremadoc graptolite zones have been proposed in Scandinavia, and
North and South America. In South China, the coeval graptolite strata are widespread in deep water facies, but the successions
of graptolite zones recognized so far are quite incomplete and thus very difficult to be correlated with those in other countries.
In recent years, we have sampled bed by bed the Nanba section in the Yiyang area, Hunan Province and, below the Tetragraptus approximatus Zone, identified four Upper Tremadoc graptolite zones in descending order: the Hunnegraptus copiosus Zone, the Araneograptus murrayi Zone, the Aorograptus victoriae Zone and the Adelograptus tenellus Zone. To date, the Nanba section is the only section in China that presents a relatively complete and globally comparable
succession of Upper Tremadoc graptolite zones. Therefore, this study not only confirms the existence of some Upper Tremadoc
graptolite zones that were never found before in China, but also facilitates a highly resolved division and correlation for
the Upper Tremadoc graptolite strata in China.
Supported by National Natural Science Foundation of China (Grant No. 40472014) |
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Keywords: | biologic zonation global correlation Upper Tremadoc graptolites South China |
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