Deformation and Activity Characteristics of Strike-slip Fault Zones in the Western Shunbei Area, Tarim Basin

doi:10.19657/j.geoscience.1000-8527.2025.030

Abstract

Abstract:

Several NNW-trending strike-slip faults are developed well in the area west of the Shunbei No.5 Fault Zone in the Tarim basin, which have controlled hydrocarbon accumulation in the Ordovician carbonate rocks.However, research on the development characteristics and formation mechanisms of these strike-slip fault zones remains limited.Based on the refined interpretation results of the latest 3D seismic data, the paper analyzes the characteristics of differential deformation of the strike-slip fault zones in the western Shunbei area, clarifies the activity periods and intensities of the strike-slip faults, and investigates their formation mechanisms in the context of regional orogenic events along the basin margin.The strike-slip fault zones in the western Shunbei area extend downward into the Precambrian and upward to the Permian. In cross-section, they mostly present as single upright faults, flower structures, and graben morphologies. On the plane, the strike-slip fault zones are mainly distributed in a NNW-trending linear and en-echelon pattern, with overlapping segments developed in local areas. The strike-slip fault zones mainly undergo right-lateral strike-slip movement, and the activity intensity of the fault zones gradually diminishes eastward.The strike-slip fault zones in the western Shunbei area have mainly gone through four evolutionary stages: the initial weak strike-slip stage in the Early Caledonian, the strong strike-slip stage in the Middle Caledonian, the weak strike-slip stage from the Late Caledonian to the Early Hercynian, and the continuous weak strike-slip stage from the Middle to the Late Hercynian.By analyzing the differential orogenic activities on the basin margin of the Tarim Basin and the characteristics of the regional stress field, it is pointed out that pre-existing shear fractures serve as the basis for the formation of the NNW-trending strike-slip fault zones in the western Shunbei area. Moreover, multi-stage adjustment deformation, oblique compression, and intra-plate block rotation also exert important influences on the development of the strike-slip fault zones.

Key words: strike-slip fault zone, differential deformation, activity intensity, Tarim Basin, western Shunbei

CLC Number:

P542

HUANG Cheng, LIN Bo, YU Yixin, YANG Fan, YU Lang, CHEN Junyu, NIU Yuemeng. Deformation and Activity Characteristics of Strike-slip Fault Zones in the Western Shunbei Area, Tarim Basin[J]. Geoscience, 2025, 39(04): 871-883.

Figures/Tables 11

Fig.1 Schematic map of the regional location of Shunbei and adjacent areas(a), and strike-slip fault system in Shunbei and adjacent areas of the Tarim Basin(b) (modified after reference[26])

Fig.2 Comprehensive stratigraphic column of the Paleozoic in the western Shunbei area, Tarim Basin

Fig.3 Typical seismic profiles of strike-slip fault zones in the northern part of the study area(See Fig.1 for profile locations)

Fig.4 Typical seismic profiles of strike-slip fault zones in the central part of the study area(See Fig.1 for profile locations)

Fig.5 Typical seismic profiles of strike-slip fault zones in the southern part of the study area(See Fig.1 for profile locations)

Fig.6 Distribution of faults at different stratigraphic interfaces in the western Shunbei area

Fig.7 Deformation amplitudes of strike-slip fault zones at different stratigraphic interfaces in the western Shunbei area

Fig.8 Widths of strike-slip fault zones at different stratigraphic interfaces in the western Shunbei area

Fig.9 Schematic diagram for analyzing movement directions of strike-slip fault zones in the western Shunbei area

Fig.10 Schematic division of activity periods of strike-slip fault zones in the western Shunbei area(See Fig.1 for profile locations)

Fig.11 Formation and evolution model of strike-slip fault zones in the western Shunbei area

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