Carboniferous Tectono-stratigraphic Division and Basin-forming Background in the Bogda Area, Eastern Tianshan

doi:10.19657/j.geoscience.1000-8527.2022.043

Abstract

Abstract:

The Bogda area experienced the evolution processes involving the Paleozoic subduction-accretion and Meso-Cenozoic multi-stage intracontinental deformation, but controversies remain regarding the Carboniferous tectonic attribute and evolutionary stages in the Bogda Mountain, which restricts further research on the late Paleozoic tectonic framework in North Xinjiang. Integrating the outcrop geology, borehole and seismic data from the Bogda Mountain and its adjacent basins, we carried on a comprehensive comparative study of the Carboniferous stratigraphic framework and magmatic characteristics in a basin-orogen scale by the basin analysis theory and method. Accordingly, we divided the Carboniferous tectonic-stratigraphic units in the Bogda area and analyzed the Carboniferous tectonic setting. Our results show that the unconformity between the Lower Carboniferous and pre-Carboniferous strata (C₁/AnC) are present in the Junggar Basin and Tuha Basin adjacent to the Bogda Mountain, while the unconformities, including the Upper and Lower Carboniferous (C₂/C₁), and Permian and Upper Carboniferous (P/C₂) ones, are commonly developed in the Bogda Mountain and its adjacent basins. Thus, the Carboniferous strata in the Bogda area are subdivided into two tectono-stratigraphic units, i.e., Lower Carboniferous and Upper Carboniferous, which reveals that the study area has undergone two major tectonic evolutionary stages. Combining the structural deformation evolution, basinal subsidence characteristics and tectonic setting, we suggested that the Carboniferous Bogda represents a back-arc basin in the subduction-related extension regime, which underwent two stages of rifting. The peripheral collisional events may have caused the later tectonic inversion for both rift basins during the late period.

Key words: Carboniferous, unconformity, tectono-stratigraphic sequence, back-arc rift basin, Bogda area, Tianshan Orogenic Belt

CLC Number:

P548
TE121.1

FAN Dan, LI Di, HE Dengfa, HOU Shuoqin, SUN Tiange, YANG Hao, ZHEN Yu. Carboniferous Tectono-stratigraphic Division and Basin-forming Background in the Bogda Area, Eastern Tianshan[J]. Geoscience, 2022, 36(05): 1206-1217.

Figures/Tables 9

Fig.2 Carboniferous geochrono-stratigraphic sequence of the Bogda Mountain

Fig.3 Carboniferous stratigraphic sequence for the Junggar Basin

Fig.4 Carboniferous stratigraphic sequence for the Tuha Basin

Fig.1 Tectonic outline of the Central Asian Orogenic Belt[8,23] (a) and major tectonic units in the East Tianshan area[8](b)(age data of the magmatic rocks from ref.[8])

Fig. 5 Carboniferous stratigraphic sequence of the Well Cheng1 in the Junggar Basin(a) and Well Cheng1-related seismic geological structure profile(b)

Fig. 6 Carboniferous stratigraphic sequence of the Well Ke1 in the Tuha Basin(a) and Well Ke1-related seismic geological structure profile(b)

Fig.7 Basin-orogen-scaled Carboniferous geochronolo-stratigraphic framework in the Bogda area

Fig.8 Characteristics of tectonic subsidence in the different mechanisms basins[49] (a) and characteristics of Carboniferous tectonic subsidence in the Bogda area(b)

Fig.9 Tectonic discrimination diagrams for the Carboniferous magmatic rocks

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