A Carbon Isotopic Stratigraphic Pattern of the Late Palaeozoic Coals in the North China Platform and Its Palaeoclimatic Implications

查看全文 作　　者：ZHANG [1]Hong;SHEN [2]Guanglong;HE [1]Zonglian 机构地区：[1]1. Institute of Geology, Xi'an Branch, China Coal Research Institute, 44 Northern Yanta Road, Xi'an 710054, Shaanxi Province, China.;[2]2. Department of Geology, Northwest University, 1 North Taibai Road, Xi'an 710069, Shaanxi Province, China; 出　　处：《Acta Geologica Sinica(English Edition)》索引1999年第73卷第1期,共9页 摘　　要：This paper gives the stable carbon isotopic data in coals from the Late Namurian to Kazanian stages inthe Serteng Mt., Xishan and Huainan coalfields of the North China Platform. Its stratigraphic pattern shows that sev-eral isotopic shifts are apparent, and the large δ¹³C negative shifts (approximately 2.5 to 3.0‰) occurred during theStephanian, Artinskian and Kazanian are observed in three Permo-Carboniferous coalfields. Those negative shifts areneither related to the coal rank and coal macerals, nor caused by the variety of peat-forming plants. The general de-crease in the δ¹³C values of the Stephanian, Artinskian and Kazanian coals is consistent with an overall decrease inthe δ¹³C values of ambient atmospheric CO₂ and/or a relative increase in atmospheric P_CO2 during the coal-forming pe-riods. Therefore the authors postulate that the oxidation of peat, and the δ¹³C-depleted CO₂ flux into the atmosphereduring the above stages may have contributed to coeval palaeoclimatic warming by way of the greenhouse effect. 关 键 词：CARBON isotope coal PALAEOCLIMATE Late PALAEOZOIC the North China Platform