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Carbon and Oxygen isotope stratigraphy of the Lower Triassic at Northern Pingdingshan section of Chaohu,Anhui Province,China

ZUO Jing xun 1) , TONG Jin nan 1) , QIU Hai ou 2) , and ZHAO Lai shi 1) ( 1) Faculty of earth sciences, China University of Geosciences, Wuhan 430074; 2)Faculty of Material Science and Chemical Engineering,China University of Geosciences, Wuhan 430074)  
Results of 124 carbonate samples for carbon and oxygen isotopic analysis collected in the Northern Pingdingshan Section in Chaohu, Anhui Province, show relatively low mean values in δ 13 C of -1.77‰ in Induan, followed by a large negative shift with the mean values of -3.90‰ in the earliest Olenekian, and then a distinctive positive shift with the mean values of 3.65‰ in the Middle Olenekian. Similarly, the mean values inδ18O decrease from -6.87‰ in Induan to -8.56‰ in the earliest Olenekian, and then return up to -6.52‰ in the Middle Olenekian. Consequently, a gradual increase, a sharp negative shift and a pronounced positive shift in values of δ 13 C occurred in Induan, in the earliest Olenekian and in the Middle Olenekian, respectively. The characteristics of carbon and oxygen isotopic trends imply a harsh environment that was disadvantageous to marine faunas, suggesting a very slow recovery in the Early Triassic. Further more, the repeated geological events might have been responsible for the prolonged recovery interval following the mass extinction.
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