Analysis on the Lithofacies and Paleogeography of Fengtai Group in the Southeast North China Block
- Received Date: 1900-01-01
- Rev Recd Date: 1900-01-01
- Publish Date: 2006-04-10
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Key words:
- sedimentary facies /
- sedimentary microfacies /
- paleogeography /
- Fengtai Formation /
- North China Block
Abstract: 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.
| Citation: | CAO Gaoshe. Analysis on the Lithofacies and Paleogeography of Fengtai Group in the Southeast North China Block[J]. Acta Sedimentologica Sinica, 2006, 24(2): 210-216.
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