| Li Xuelun,Liu Baohua,Lin Zhenhong,Wang Yonghong. 1997. Formation and tectonic evolution of outer margin upfold zone of East China Sea Shelf. Acta Oceanologica Sinica, (4):491－504 |
| Formation and tectonic evolution of outer margin upfold zone of East China Sea Shelf |
| Formation and tectonic evolution of outer margin upfold zone of East China Sea Shelf |
| Received:February 10, 1997 Revised:June 18, 1997 |
| DOI： |
| Key words:East China Sea Shelf outer margin upfold zone formation tectonic evolution |
| 中文关键词: East China Sea Shelf outer margin upfold zone formation tectonic evolution |
| 基金项目:The project was supported by the National Natural Science Foundation of China under contract No. 49376262. |
| Author Name | Affiliation | | Li Xuelun | College of Marine Geoscience, Ocean University of Qingdao, Qingdao 266003, China | | Liu Baohua | First Institute of Oceanography, State Oceanic Administration, Qingdao 266003, China | | Lin Zhenhong | College of Marine Geoscience, Ocean University of Qingdao, Qingdao 266003, China | | Wang Yonghong | College of Marine Geoscience, Ocean University of Qingdao, Qingdao 266003, China |
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| Abstract: |
| The outer margin upfold zone of the East Chine Sea Shelf is a submarine residual volcanic arc between the continent-side back-arc rift-subsidence basins (shelf basin and Okinawa Though) of the Philippine Sea Plate subduction zone.Its geophysical field features, stratigraphic composition, magmatic activity and geological structures are charec-terized by forming "zonation from west to east and blocks from north to south".The upfold zone developed from the beginning of Tertiary when it was continental margin island arc.After Miocence, because of the tension-fracture action of the Okinawa Trough behind the Ryūkyū Arc, it became the residual arc of the ancient Ryūkyū Arc.The formation mechanism was controlled by the tectonic framework of the East China Sea, and was related to the subduction of the Philippine Sea Plate and the eastward movement of the subduction zone.The formation of upfold zone of the East China Sea went through 4 stages:(1) fracture-uplift volcanic arc (E1-E2), (2) fold-uplift volcanic arc (E3), (3) fold-up-lift residual arc (N1) and (4) withered residual arc (N2-Q).In the last stage, the upfold zone and shelf basin were depressed in whole and deposited almost 1 500 m Pliocene-Quaternary sediments of shallow-sea facies. |
| 中文摘要: |
| The outer margin upfold zone of the East Chine Sea Shelf is a submarine residual volcanic arc between the continent-side back-arc rift-subsidence basins (shelf basin and Okinawa Though) of the Philippine Sea Plate subduction zone.Its geophysical field features, stratigraphic composition, magmatic activity and geological structures are charec-terized by forming "zonation from west to east and blocks from north to south".The upfold zone developed from the beginning of Tertiary when it was continental margin island arc.After Miocence, because of the tension-fracture action of the Okinawa Trough behind the Ryūkyū Arc, it became the residual arc of the ancient Ryūkyū Arc.The formation mechanism was controlled by the tectonic framework of the East China Sea, and was related to the subduction of the Philippine Sea Plate and the eastward movement of the subduction zone.The formation of upfold zone of the East China Sea went through 4 stages:(1) fracture-uplift volcanic arc (E1-E2), (2) fold-uplift volcanic arc (E3), (3) fold-up-lift residual arc (N1) and (4) withered residual arc (N2-Q).In the last stage, the upfold zone and shelf basin were depressed in whole and deposited almost 1 500 m Pliocene-Quaternary sediments of shallow-sea facies. |
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