Discovery of phosphate concretions in the upper Sinian Fengtai Formation at the southeast margin of the North China block and their implications

CAO Gao-she; ZHANG Shan-wen; SUI Feng-gui; YANG Xiao-yong; LIU De-liang

Geological Bulletin of China > 2006 > 25(4): 454-459.

CAO Gao-she, ZHANG Shan-wen, SUI Feng-gui, YANG Xiao-yong, LIU De-liang. 2006: Discovery of phosphate concretions in the upper Sinian Fengtai Formation at the southeast margin of the North China block and their implications. Geological Bulletin of China, 25(4): 454-459.

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Discovery of phosphate concretions in the upper Sinian Fengtai Formation at the southeast margin of the North China block and their implications

School of Resources and Environment, Henan Polytechnic University, Jiaozuo 454000, Henan,China; 2. Research Institute of Geological Sciences, Shengli Oilfield Administration, Dongying 257015, Shandong,China; 3. School of Earth and Space Sciences,China

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Received Date: January 23, 2005
Revised Date: October 09, 2005

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Phosphate concretions have been found in the basal and middle parts of the Fengtai Formation at the southeast margin of the North China block, which indicates that the Fengtai Formation (at least a part of it) probably formed in the warm marine environment. The geochemical characteristics of the phosphate concretions indicate that the depositional environments of the two horizons of phosphate concretions are different: the base of the Fengtai Formation formed in a marine environment with relatively strong mantle activity, while the middle part formed in a closed environment with relatively weak mantle activity.
- Upper Siman Fengtai Formation,
- phosphate concretion,
- southeast margin of the North China block

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Discovery of phosphate concretions in the upper Sinian Fengtai Formation at the southeast margin of the North China block and their implications

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