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中文摘要：
华北陆块东南缘凤台组的底部和中部存在磷结核。这些磷结核的发现表明，凤台组（至少有部分地层）可能形成于温暖的海相环境。凤台组底部与中部磷结核的地球化学特征分析表明，2个层位磷结核的沉积构造环境存在差异，凤台组底部形成于地幔活动较强的海相环境，而中部形成于地幔活动性较弱的闭塞环境。
英文摘要：
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 mande activity, while the middle part formed in a closed environment with relatively weak mande activity.
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