华北陆块东南缘凤台组岩相古地理分析

对华北陆块南缘凤台组的沉积相和沉积微相研究表明，凤台组具有海底扇的沉积模式。根据凤台组的沉积分布特征，其总体为海底扇的水道沉积。这一水道相似于陡倾大陆边缘的海底峡谷，其产生可能与断裂作用有关。

Analysis on the Lithofacies and Paleogeography of Fengtai Group in the Southeast North China Block

Fengtai Formation sedimented at the transition phase of Sinian and Cambrian has important meanings to confirm the sedimentary and tectonic circumstances of this transition phase by analyzing the lithofacies and paleogeography of this Formation. The lithofacies of Fengtai Formation mainly consist of silty mudstone facies contained phosphate concretions, blocky conglomerate facies, layered(coarsely layered) conglomerate facies, lens-shaped lithic greywacke facies contained gravels and arenaceous conglomerate facies, layered lithic greywacke (contained gravels)facies, rhythmically laminated lithic greywacke facies, which assembly bears the sedimentary model of submarine fan.The microfacies of Fengtai Formation mainly consist of conglomerate and lithic greywacke microfacies contained pyrites, lithic greywacke microfacies with neddle-like ring edge structure, breccias microfacies, lithic greywacke microfacies with reverse grading, which assembly bears the features of continental margin. Based on the above and the feature of sedimentary distribution,Fengtai Formation collectively is channel deposition of submarine fan which is similar to submarine canyon at high-angle continent edge probably generated by fault movement.