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《Acta Sedimentologica Sinica》 2003-04
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REEs Geochemistry of Doushantuo Phosphorites and Modification during Post Sedimentary Stages in Weng'an Area,South China

XIE Qi lai 1,2 CHEN Duo fu 2 QI Liang 3 CHEN Xian pei 2 1(Basin & Reservoir Research Center, University of Petroleum, Beijing 102249) 2(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640) 3(Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002)  
The Neoproterozoic Doushantou phodphorites in Weng'an, South China, preserved a unique assemblage of a most likely the earliest metazoan in the world. The reconstruction of paleoenvironmental change, when the Weng'an metazoan fauna emerged, is most important. But REE diagenetic modification of the Doushantou phosphorites must be evaluated. This paper is to discuss the REE modification in the Weng'an phosphorites during post sedimentary stages by REE geochemistry of phosphatic and dolomitic cements, phosphatic clasts in the upper phosphorites, phosphorite and shale bands in the lower phosphorites. The later diagenetic mineral phases: dolomitic and phosphatic cements display similar North American Shale normalized REE patterns with associated authigenic phosphatic phases and suggest that the REE geochemical characteristics in the Doushantuo phosphorites could be taken as primary signatures of paleoseawater conditions and may imply that the REE in the authigenic phosphatic phases were not modified during their burial, digenesis and surface weathering. The different REE characteristics in the phosphatic bands and associated shale bands in couplet samples suggested that the REE digenetic reaction might be only taken place within-strata but not between strata. Negative correlation of Er N/Lu N and positive correlation of La N/Nd N with Ce/Ce * suggests that the HREE and LREE depletions may derive from the change of paleoseawater redox condition, and HREE, LREE appear to be more depletion in the more oxidizing condition caused more Ce depletion.
【Fund】: 国家重点基金 (批准号 :498330 0 2 );; 国家自然科学基金(批准号 :40 2 730 32 );; 中国科学院广州地球化学研究所知识创新项目(GIGCX 0 3 0 4 )资助
【CateGory Index】: P595
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