The evidence of fossil carbon isotopes of the climatic event at the beginning of Quaternary |
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Authors: | Tao Deng Xiangxu Xue Junshe Dong |
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Institution: | (1) Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences, 100044 Being, China;(2) Department of Geology, Northwest University, 710069 Xi’an, China |
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Abstract: | Tooth enamel of mammalian fossils can efficiently preserve the original carbon isotopic mposition when they lived. The ungulate
fossils, especially equids in the early Early Pleistocene Bajiazui fauna from Qingyang, Gansu are studied. According to the
enriched relation of carbon isotopes between mammalian tooth enamel and grass diets, the fractions of C3 and C4 plants in this region at that time are reconstructed, which indicates that C3 grass occupied a dominant position. Because C3 grass adapts itself to cold and clamp climates, cur analytic results show that the time of the Bajiazui fauna was in a critical
state between a glacial stage beginning and a summer monsoon retreat, and it was a reflection to the turning cold event of
the global climate at the beginning of the Quaternary. |
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Keywords: | climatic event Quaternary ungulate carbon isotope |
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