Mechanisms of Cenozoic deformation in the Bohai Basin, Northeast China: Physical modelling and discussions |
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摘 要: | The Bohai Basin is a petroliferous Cenozoic basin in northeast China (Fig. 1(a)) and has apparent geo- metrical and kinematic similarities with the other Meso-Cenozoic extensional basins located along the eastern margin of the Eurasian Plate1,2]. Its architec- ture and Cenozoic stratigraphy have been well under- stood from several decades of petroleum exploration. Previous studies have suggested that the Bohai Basinis a typical extensional basin and has two tectonic evolution phases, rift…
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收稿时间: | 10 January 2005 |
修稿时间: | 13 July 2005 |
Mechanisms of Cenozoic deformation in the Bohai Basin, Northeast China: Physical modelling and discussions |
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Authors: | ZHOU Jianxun ZHOU Jiansheng |
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Institution: | 1. Key Laboratory for Hydrocarbon Accumulation of Chinese Ministry of Education and Department of Earth Science, China University of Petroleum, Beijing 102249, China 2. Dagang Petroleum Sub-corporation of PetroChina Company Limited, Tianjin 300280, China |
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Abstract: | The Bohai Basin is a Cenozoic petroliferous extensional basin in China and has apparent geometrical and kinematic similarities
with the other Meso-Cenozoic extensional basins located along the eastern margin of Eurasian Plate. However, the deformation
mechanisms of the basin are still in dispute. Physcial modelling referring to the Huanghua Depression, located in the central
part of the Bohai Basin was conducted employing four sets of planar sandbox experimental models with different extension directions.
Only experimental results of the model with N-S extension show good structural similarity with the depression. The results
also indicate that complex variations of fault strike in a rift basin are not necessarily the results of complex kinematic
mechanisms or polyphase deformation. Based on comparison of experimental results with the actual structures and the good structural
similarity between Huanghua Depression and the whole Bohai Basin, it is concluded that the Bohai Basin was formed by the N-S
extension. The strike slip deformation along the NNE-trending border faults of the basin resulted from the N-S extension and
played the role of lateral transformation for the N-S extension. In addition, according to the apparent geometrical and kinematic
similarities among the Bohai Basin and other Meso-Cenozoic extensional basins located along the eastern margin of the Eurasian
Plate, it is proposed that: (1) this “N-S extension” model provides a better kinematic interpretation for the formation of
Bohai Basin and the other adjacent basins located along the eastern margin of the Eurasian Plate; and (2) the N-S extension
was probably the effect of the “slab window” formed by the subduction of the nearly E-W trending oceanic ridge between the
Kula and Pacific Plates. The “slab window” effect can also provide reasonable explanations for the phenomena that initial
rifting ages of basins become progressively younger westwards along the eastern margin of the Eurasian Plate and that these
basins changed gradually from rifting to thermal subduction. |
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Keywords: | Bohai Basin physical modelling Cenozoic extensional tectonics |
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