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《Earth Science(Journal of China University of Geosciences)》 2011-04
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The Paleotemperature Study in Brachiopod Shells

CHENG Hong-guang1,2,LI Xin-qing1,YUAN Hong-lin2,WANG Bing1,3,CHENG Jian-zhong1,31.State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550002,China2.State Key Laboratory of Continental Dynamics,Northwest University,Xi'an 710069,China3.Graduate School,Chinese Academy of Sciences,Beijing 100049,China  
The study of temperature changes is the key to the understanding of the variations of earth climate system.A systematic study on the global climatic evolution and its driving mechanism facilitates the understanding of temperature variations.Because of the preservation ability and the distribution of brachiopod shells in Paleozoic,it has been regarded as a common method to distill the oxygen isotopic information from brachiopod shells assigned as preserved well to reconstruct temperature changes in ancient seawater.But there were few reports utilizing their Mg/Ca(mmol/mol) ratios to research variations of temparature in ancient seawater.In this study,brachiopod shells collected from Longmen Mountain in Sichuan Province were analyzed for δ18O and trace elements Mn,Fe,Mg,Sr and Ca.With optical observation,cathodoluminescence and trace elements concentration,brachiopod shells were assigned to be preserved well and those data of oxygen isotope and trace elements were valid.Compared with the temperatures calculated with oxygen isotope thermometer,the temperatures of the Mg/Ca ratio thermometer are more similar with the ones indicated by biological and paleogeographical evidences.It is possibly due to the unknown oxygen isotope in ancient seawater and its instability.Though the Mg/Ca ratios were also affected by the salinity and pH of ancient seawater,the temperatures according to Mg/Ca ratio thermometer in brachiopod shells were similar with those in reality.
【Fund】: 国家自然科学基金项目(No.41003006);; 省科学技术基金(No.2009GZ49244);; 西北大学大陆动力学国家重点实验室开放课题基金(No.08LCD04)
【CateGory Index】: Q915.2
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