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THE FLUID COMPOSITIONS AND C, O ISOTOPIC GEOCHEMISTRY OF CENOZOIC ALKALI BASALTS IN EASTERN CHINA

Zhang Mingjie; Wang Xianbin; Liu Gang; Wen Qibin; Li Liwu (Department of Geology, Lanzhou University, Lanzhou 730000)(Lanzhou Institute of Geology, Chinese Academy of Sciences, Lanzhou 730000)  
The fluid compositions in Cenozoic alkali basalts in eastern China have been determined by pyrolysis-MS method, meanwhile the carbon and oxygen isotopic compositions of CO2 released from these samples at different heating temperatures have been analyzed by vacuum steppedly heating method. The volatile contents and carbon,oxygen isotopic compositions of CO2 in these alkali basalts show the unhomogeneous upper-mantle sources in eastern China, and these alkali basaltic magmas may be generated in the oxidizing mil'ieu, comparing with mantle rock-derived xenoliths in these alkali basalts, and exotic volatile components were mixed into these magmas in the process of their formation and development.
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