Characteristics and formation mechainism of the strike-slip fault networks in the Shunbei area and the surroundings, Tarim Basin

doi:10.13745/j.esf.sf.2023.2.31

Abstract

Abstract:

Intracratonic strike-slip fault systems in the Tarim Basin are characterized by small displacement, low strain deformation and large burial depth. These attributes make it challenging to study the formation mechanism of these fault systems. Based on the recently obtained high-density 3D seismic data, 3D mapping and detailed analysis of strike-slip faults are conducted in Shunbei and its surrounding area. The distinct characteristics of fault array development in the east and west of the Shunbei area are analyzed and clarified, and the formation mechanism of the strike-slip arrays is also discussed. It was found that a set of ~30NE trending strike-slip faults, including the major and secondary strike-slip faults, are developed in eastern Shunbei. At depth, strike-slip deformation is stronger in the major faults than in the secondary faults, and the compressive strain increases gradually eastward in the major faults. In the shallow strata en echelon fault activity intensifies eastward. The strike-slip fault systems differ between the northwest and southwest of Shunbei. The northwest mainly develops a set of NW-trending faults spreading southward from the Tabei uplift, whereas in the southwest a set of ~15NE trending faults with high density and multistage activity are developed. The strike-slip fault systems in Shunbei are characterized by “north-south zonal distribution, east-west differential activity and multi segments coalescing growth”, indicating the fault systems consist of multiple sets of strike-slip faults formed in different areas under distinct regional stress fields and later coalesced in the interior Tarim Basin, and their formation is probably related to multi-directional compressional tectonic event at the basin boundaries in the Late Ordovician.

Key words: segmented structure, layered deformation, formation mechanism, strike-slip fault system, Tarim Basin

CLC Number:

TE121.1

LIU Yuqing, DENG Shang, ZHANG Jibiao, QIU Huabiao, HAN Jun, HE Songgao. Characteristics and formation mechainism of the strike-slip fault networks in the Shunbei area and the surroundings, Tarim Basin[J]. Earth Science Frontiers, 2023, 30(6): 95-109.

Figures/Tables 12

Fig.1 Distribution of major faults in the Lower Paleozoic andthe Paleozoic strata in the Shunbei area and the surroundings. a and c adapted from [12].

Fig.2 Coherence slices of T74 reflecting interface forstrike-slip faults (a) and the interpretations (b) in the eastern Shunbei area, Tarim Basin

Fig.3 Segments (a) and overlap zones characteristics (b) in the T74 reflecting interface of the strike-slip fault system in the east Shunbei area

Fig.4 The characteristics of pressure ridges of the strike-slip fault system in the eastern Shunbei area. b adapted from[23].

Fig.5 Coherence slices of T70 and T56 reflecting interfaces for strike-slip faults and the interpretations in the eastern Shunbei area, Tarim Basin

Fig.6 Atypical seismic profile showing deep deformation charactristics of the secondary strike-slip faults in the eastern Shunbei area

Fig.7 Comparison of en echelon faults’ characteristics in T56 interface between the main and secondary strike-slip faults in the eastern Shunbei area

Fig.8 Coherence slice of the T74 reflecting interface forstrike-slip faults and the interpretations in the northwestern Shunbei area. Part of coherence slice adapted from [29].

Fig.9 The profiles showing the characteristics of typical overlap zones of strike-slip faults in the northwestern Shunbei area (see Fig.8b for the location of profiles)

Fig.10 Coherence slices of various reflecting interfaces forstrike-slip faults and the interpretations in the southwestern Shunbei area

Fig.11 Atypical seismic profile showing muti-stages charactristics of the strike-slip faults in the southwestern Shunbei area (see Fig.10b’ for the location of the profile)

Fig.12 Schematic models showing the formation mechanism of the strike-slip fault network in the Shunbei area and the surroundings

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