Flysch Trace Fossils from the Hercynian and IndosinianOrogenic Belts of North western China andTheir Palaeoenvironmental Significance |
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| Authors: | Gong Yiming Faculty of Earth Science China University of Geosciences Wuhan Hubei Province |
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| Institution: | 1. Faculty of Earth Science, China University of Geosciences, Wuhan, Hubei Province 430074
Gong Yiming Born in October 1958;2. graduated from the Department of Geology, Wuhan College of Geology in 1981;3. received his Ph.D. degree in China University of Geosciences in 1991. He is now a professor of China University of Geosciences (Wuhan), mainly engaged in sedimentary geology, ichnology (trace fossils) and high resolution stratigraphy. E-mail: ymGONG@dns.cug.edu.cn |
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| Abstract: | Abstract Twenty-three ichnotaxa have been found in the Silurian and Carboniferous turbidites of the Tianshan orogenic belt and the Triassic turbidites of the East Kunlun-West Qinling orogenic belt of northwestern China. They are Acanthorhaphe isp., ?Arthrophycus isp., Aulichnites parkerensis, Chondrites isp., C. intricatus, C. targionii, Cochlichnus anguineus, coprolite, Dendrotichnium haentzscheli, Helminthopsis isp., Helminthopsis abeli, H. hieroglyphica, H. cf. irregularis, Imbrichnus isp., Kunlunichnus qinghaiensis, Laevicyclus rotaeformis, Lophoctenium tianshanensis, Megagrapton isp., Micatuba verso?, Muensteria isp., Neonereites, Palaeophycus, and Zoophycos caudagalli, two of which, namely, Kunlunichnus qinghaiensis and Lophoctenium tianshanensis, are new ichnospecies. The described trace fossils can be grouped into five ichno-assemblages: the Aulichnites-Imbrichnus ichno-assemblage representing turbidity current deposits of a restricted anoxic deep-sea basin, the Lophoctenium ichno-assemblage showing the deep-sea or ocean environments relevant to a plate subduction, the Zoophycos-Helminthopsis ichnoassemblage representing the upper-middle turbidity fan deposits of a pelagic and hemipelagic environment, the Megagrapton-Chondrites ichno-assemblage representing the middle-lower turbidity fan deposits of an oceanic archipelago and the Kunlunichnus ichno-assemblage indicating bathyal turbidity current deposits. |
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| Keywords: | flysch trace fossils Silurian Carboniferous Triassic Tianshan Mountains Kunlun Mountains oro-genic belt northwestern China |
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