Discovery of the Soft-sediment Deformation Structure in the Middle-Upper Triassic Sequence of the Middle Segment of Southern North China Plate Margin and Its Geological Significance

doi:10.19657/j.geoscience.1000-8527.2020.02.12

Abstract

Abstract:

The Middle-Upper Triassic sequences in western Henan are mainly exposed at Jiyuan, Yima, Yichuan and Nanzhao. The Qinling orogenic movement controls the properties of the Middle-Upper Triassic basins in the region and the development of Indosinian sedimentary sequences. Outcrop and profile geological characteristics of the study area show, a series of typical soft-sediment deformation structures in the Middle-Upper Triassic sequences, including liquefied diapir, pillow structure, pillar, liquefied convolute, ball-and-pillow, flame-and-load structures, and liquefied breccias. These soft-sediment deformations structures show obvious reproducibility in vertical direction and lateral continuous. It is indicated that the local stratigraphy was affected by frequent and intense seismic activities during this period. By identifying these soft-sediment deformation features and determining its formation mechanism, it is revealed that the triggering factor is the earthquakes related to the Qinling orogeny. The existence of seismite in the local stratigraphy is likely a response to the Qinling orogenic movement.

Key words: western Henan, North China Plate, Qinling orogeny, soft-sediment deformation, Middle-Upper Triassic, seismic activities

CLC Number:

TE121

QUAN Xiaoyuan, LIU Chiyang, ZHANG Long, ZHANG Dongdong, WANG Jianqiang, MA Huanhuan, FENG Qi, ZHAI Guanghui. Discovery of the Soft-sediment Deformation Structure in the Middle-Upper Triassic Sequence of the Middle Segment of Southern North China Plate Margin and Its Geological Significance[J]. Geoscience, 2020, 34(02): 333-344.

Figures/Tables 8

Fig.1 Location and geologic map of the study area

Fig. 2 Field outcrop photos of soft sediment deformation

Fig.3 Profile record of soft sediment deformation

Fig.4 Photos of ball-and-pillow and flame-and-load structures

Fig.5 Profile record of load and liquefied breccias in Nanzhao

Fig.6 Trigger identification process of identify triggers

Fig.7 Profile record of tuff in Liushan

Fig.8 Stratigraphic histogram in Jiyuan and Liushan and the location of soft sediment deformation

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