Neotectonics of North China: interplay between far- field effect of India- Eurasia collision and Pacific subduction related deep- seated mantle upwelling
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    Abstract:

    North China is a seismically active region, where large- to- moderate historic earthquakes shocked frequently, and become a locus of natural laboratory for study of intraplateneotectonics. Neotectonics of North China is characterized by a rather complex pattern: normal faulting along the two graben systems surrounding the Ordos block in the west, regional uplift of the Taihang Shan Highland in the center and subsidence of the North China- Bohai Bay Plain in the east, sinistral transtensional faulting along its southern Qinling range and dextral transpressional faulting along the NNE- striking Tan- Lu Fault zone. These types of faulting occurred episodically during late Cenozoic, giving rise to a complex morpho- tectonic features. Neotectonics in North China was operated through three episodes of crustal extension- compression, respectively occurring in late Neogene (9~2.5 Ma), Early- Late Pleistocene and late Pleistocene. Crustal extension derived from fault kinematics inversion oriented either in NW- SE or in NE- SW, and crustal compression determined from focal solutions of earthquakes oriented in NE- SW to W- E. It is thought that episodic development of Neotectonics in North China has been orchestrated by the interplay of two tectonic processes: far- field effect of India- Eurasia collision and subduction- related deep- seated upwelling of lithospheric mantle. In one hand, the eastward push of the crustal fragments in NE Tibet resulted in counterclockwise rotation of the Ordos block and eastward extrusion of Qinling Range, the process of which has profoundly governed late Cenozoic extensional, transtensional and compressional deformation in North China. Specifically the late Neogene NW- SE crustal extension around the Ordos block ((10~9 Ma)~(4.2 Ma)) was concomitant with the extrusion- related orogeny along the eastern Tibetan margin, and three compressional tectonic events occurring at latest Pliocene(before 2.5 Ma), early Late Pleistocene(~200~70 ka)and since latest Pleistocene (~20 ka) are fairly coeval with those occurred along the eastern Tibetan margin. On the other hand, lithospheric mantle upwelling responsible for regional subsidence of the Bohai Bay basin in the plain region east of Mt. Taihangshan, was manifested by five episodes of mantle- derived volcanism particularly active in Early- Late Pleistocene. These two tectonic processes have been spatio- temporally interacted with each other, which has profoundly dominated Neotectonics and seismo- tectonics of North China.

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ZHANG Yueqiao, SHI Wei, DONG Shuwen.2019. Neotectonics of North China: interplay between far- field effect of India- Eurasia collision and Pacific subduction related deep- seated mantle upwelling[J]. Acta Geologica Sinica,93(5):971-1001

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History
  • Received:March 25,2019
  • Revised:April 16,2019
  • Adopted:April 18,2019
  • Online: April 22,2019
  • Published: