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《Acta Geosicientia Sinica》 2001-02
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Isotopic Evidence for the Temperature Change of the Paleo-Ocean between Late Devonian Fransnian Period and Famennian Period in South China

Wang Darui 1,2) Ma Xueping 3) Dong Aizheng 1,2) Zhu Desheng 2) ( 1) Key Laboratory of Petroleum Geochemistry, China National Petroleum Corporation,Beijing; 2)Research Institute of Petroleum Exploration and Development, Petro Ch  
The shallow platform sedimentary facies is well developed along the Laojiangchong section in Xikuangshan mine,Lengshuijiang area,Hunan Province,which includes the well known Upper Devonian Fransian Famennian(Fr/Fa) boundary.Long period of field studies and researches led the authors to reveal the palaeotnologyaswellassedimentaryassociationsandcharacteristics.TheshellsofbrachiopodCyrospirifer vernemili were analysed isotopically and by SEM in this study.The carbon and oxygen isotopic analyses ( δ 18 O:-8.4‰~-9.6‰; δ 13 C: -2.2‰~0.5‰) show an abnormal shift around the boundary of Fr/Fa in South China,which can serve as a standard of regional stratigraphic correlation.Depending on the calculation of oxygen isotopes within the well preserved brachiopods,the authors drew the inference about temperature decreasing from late Fransian to early Famennian.
【CateGory Index】: P531;P731
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