| A Lower Ordovician Carbonate Contourite Drift on the Margin of the South China Paleocontinent at Jiuxi,Northern Hunan |
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| 摘 要： | Carbonate contourite drift at Jiuxi. Taoyuan, northern Hunan, was developed in a deepwater area ofnorthern Hunan on the margin of the Early Ordovician South China palcocontinent. The Lower Ordoviciansequence in the area is more than 350 m thick and contains well-developed contourites that can be groupedinto the following five types: the calcilutitic, the arenitic, the siltitic. the fine ruditic and the bioclastic. Thefirst three often constitute a complete or incomplete contourite succession. The arenitic contourite is nearlyuniformly distributed as interlayers throughout the succession, creating a monotonously rhythmic texture inthe contourite drift. The pattern of spatial distribution of the succession shows that the contourite drift is ahuge ridge-like sedimentary body extending along the trend of paleoslope. Numerous marks of flow direc-tion have pointed to an eastward paleoflow direction along the slope.
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A Lower Ordovician Carbonate Contourite Drift on the Margin of the South China Paleocontinent at Jiuxi,Northern Hunan |
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| Authors: | Duan Taizhong Guo Jianhua Gao Zhenzhong Li Zenghua Zeng Yunfu |
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| Abstract: | Abstract Carbonate contourite drift at Jiuxi, Taoyuan, northern Hunan, was developed in a deep-water area of northern Hunan on the margin of the Early Ordovician South China paleocontinent. The Lower Ordovician sequence in the area is more than 350 m thick and contains well-developed contourites that can be grouped into the following five types: the calcilutitic, the arenitic, the siltitic, the fine ruditic and the bioclastic. The first three often constitute a complete or incomplete contourite succession. The arenitic contourite is nearly uniformly distributed as interlayers throughout the succession, creating a monotonously rhythmic texture in the contourite drift. The pattern of spatial distribution of the succession shows that the contourite drift is a huge ridge-like sedimentary body extending along the trend of paleoslope. Numerous marks of flow direction have pointed to an eastward paleoflow direction along the slope. |
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