西藏许如错地区中全新世地震触发软沉积物变形构造及其地质意义

秦雅东; 张士贞; 刘函; 李勇

doi:10.3799/dqkx.2020.117

Volume 45 Issue 8

Aug. 2020

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Article Navigation > Earth Science > 2020 > 45(8): 2945-2956

Qin Yadong, Zhang Shizhen, Liu Han, Li Yong, 2020. Earthquake-Induced Soft-Sediment Deformation Structures in Middle Holocene of Xuru Co Area in Tibet and Its Geological Significance. Earth Science, 45(8): 2945-2956. doi: 10.3799/dqkx.2020.117

Citation:

Qin Yadong, Zhang Shizhen, Liu Han, Li Yong, 2020. Earthquake-Induced Soft-Sediment Deformation Structures in Middle Holocene of Xuru Co Area in Tibet and Its Geological Significance. Earth Science, 45(8): 2945-2956. doi: 10.3799/dqkx.2020.117

Citation:

Qin Yadong, Zhang Shizhen, Liu Han, Li Yong, 2020. Earthquake-Induced Soft-Sediment Deformation Structures in Middle Holocene of Xuru Co Area in Tibet and Its Geological Significance. Earth Science, 45(8): 2945-2956. doi: 10.3799/dqkx.2020.117

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Earthquake-Induced Soft-Sediment Deformation Structures in Middle Holocene of Xuru Co Area in Tibet and Its Geological Significance

doi: 10.3799/dqkx.2020.117

Chengdu Center of China Geological Survey, Chengdu 610081, China

Received Date: 2020-03-24
Publish Date: 2020-08-15

Abstract

Abstract

The lacustrine paleo-seismic study is an important supplement to the research of a complete paleo-seismic sequence. A large number of earthquake-induced soft-sediment deformation structures (seismites) were newly discovered in the Holocene lacustrine deposits in Xuru Co area by detailed field geological survey. Soft-sediment deformation markers mainly include liquefied vein,liquefied convolute,liquefied breccia,hydraulic structure,liqufied droplets and cusps,conglomerate mound,load structure and flance structure. The syn-seismic structure deformation markers were also developed including syn-seismic fault,seismic fissure,and syn-fold. Based on the empirical statistical relation between the earthquake magnitude and soft-sediment deformation markers,combining historical earthquake statistics with the range of liquefied particles,it is suggested that the maximum magnitude may exceed 7.5. The C¹⁴ and OSL dating results for samples suggest that the age of the paleoearthquake is around 7.5 ka. The work fills the gap of historical earthquakes in the area,and provides material for restoring the history and migration law of earthquakes in the NS-trending grabens of the Tibetan Plateau. A large amount of gravel liquefaction was found in seismite,which poses a new challenge to the investigation of sand liquefaction,which is dominated by sand and silt.
- seismite,
- paleoearthquake,
- Holocene,
- gravel liquefaction,
- Xuru Co graben,
- stratigraphy

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References(59)

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