Alternation of back-arc extension and compression in an overriding plate: evidence from Cretaceous structures in the western Liaoning region, eastern China

被引:0
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作者
Nan Su
Guang Zhu
Cheng Liu
Shuai Zhang
Yunjian Li
Hao Yin
Xiaodong Wu
机构
[1] Hefei University of Technology,School of Resource and Environmental Engineering
来源
International Journal of Earth Sciences | 2020年 / 109卷
关键词
Structural evolution; Stress state; Back-arc deformation; North China Craton; Western liaoning region;
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学科分类号
摘要
The dynamic evolution in an overriding plate remains a controversial issue. Cretaceous structures in the western Liaoning (WL) region of the eastern North China Craton (NCC), an overriding plate bordering the Pacific Ocean, provide insights into the dynamic evolution related to Paleo-Pacific Plate subduction. We present structural and fault-slip data from the Jurassic–Cretaceous basins in the WL region, together with previously published isotopic ages, to constrain structural and stress field evolution during the Cretaceous. These data reveal four phases of deformation in the WL region: tectonic shortening (D1) at 137–136 Ma, extension (D2) during 136–97 Ma, another shortening (D3) at the beginning of the Late Cretaceous, and relatively weak extension (D4) during the Late Cretaceous. Inversions of the measured fault-slip data yield NW–SE compression during D1, NW–SE extension during D2, NNW–SSE compression during D3, and N–S extension during D4. Deformation phases D1 and D3 correspond to shortening events B and C of the Yanshan Movement, whereas D2 corresponds to the peak destruction of the NCC in a back-arc extensional setting. The structural evolution indicates that the back-arc extension (D2) of the Early Cretaceous started immediately after the brief shortening event D1 and ended with another shortening event D3. Subsequently, the back-arc region underwent weak extension (D4) during the Late Cretaceous. A slab-driven model could account for the tectonic evolution in the eastern NCC. Periodic changes in the kinematics of the subducting Paleo-Pacific Plate are responsible for the alternation of the back-arc extension and compression in the overriding plate.
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页码:707 / 727
页数:20
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