Formation and Forward Propagation of the Indosinian Foreland Fold‐Thrust Belt and Nanpanjiang Foreland Basin in SW China

Abstract

The incorporation of foreland basin deposits into forward propagating fold-thrust belts is an essential process in the horizontal growth of orogenic belts (e.g.,

Metallogenesis of the giant Maoping carbonate‐hosted lead–zinc deposit, southwestern Yangtze Craton: New insights from structural geology and whole‐rock geochemistry

“…The similar NW–directed compressional deformation has also been reported in the adjacent area to its northeast, where the Cretaceous top‐to‐the‐NW thrusting and fault‐propagation folds have been widely documented according to previous systematic structural analysis (L. Qiu et al, 2016). Further to the northeast, the well‐known Xuefengshan tectonic belt have also been suggested to be characterized by the development of the NE–SW‐striking chevron anticline and/or box syncline folding, which also indicates an intense NW–SE shortening (L. Qiu et al, 2016; Yan, Zhou, Song, Wang, & Malpas, 2003; W. X. Yang et al, 2021). In fact, previous studies have proposed that the NW–SE shortening have intensively affected the whole Yangtze Craton, which have been attributed to the westward subduction of the Pacific Plate (J. H. Li, Zhang, et al, 2014; Y. J. Wang et al, 2013; Yan et al, 2003; Y. Q. Zhang & Dong, 2019).…”

“…By comparing with the regional tectonics, we suggest that this stage of deformation may have been affected by the reactivation of the early Palaeozoic ZYF during the Late Yanshanian movement (Figure 1b; K. G. Yang, Li, Dai, Zhang, & Zhou, 2012; K. G. Yang et al, 2020). The multi‐reactivated NW–SE‐striking ZYF have been suggested to be dominated by a dextrally transpressional tectonic event during the Late Mesozoic, although the Cenozoic overprinting tectonic event may cause a sinistral displacement of 50–100 km (L. Qiu et al, 2016; W. X. Yang et al, 2021).…”

“…To the north, the Yangtze Craton is separated from the North China Craton by the Triassic Qinling–Dabie Orogen (Figure 1a; F. L. Liu & Liou, 2011; Tang et al, 2019, 2021), and its western boundaries separate it from the Songpan–Ganzi Terrane to the northwest and the Indosinian Block to the southwest, respectively (Figure 1a). The southwestern Yangtze Craton is composed of the pre‐Ediacaran metamorphic crystalline basement and the Ediacaran to Cenozoic sedimentary cover (L. Qiu et al, 2016; W. X. Yang et al, 2021; Figure 1b). The pre‐Ediacaran basement consists of the Palaeoproterozoic highly metamorphosed volcanic–sedimentary rocks and the overlying Mesoproterozoic to early Neoproterozoic weakly metamorphosed and folded volcanic–sedimentary sequence (Gao et al, 2011; Y. M. Qiu, Gao, McNaughton, Groves, & Ling, 2000).…”

Early Mesozoic Anatexis‐Induced Strain Partitioning and Gneiss Doming in the Yunkai Massif, South China: A Response to Contrasted Dynamics of Paleo‐Pacific and Paleo‐Tethys Subductions?

“…Thrust sheets and folds associated with the Indosinian convergence were propagated northward into the South China Block only after 245 Ma (J. Li, Zhao, et al., 2017; W.‐X. Yang et al., 2021). The only influence of the Indosinian‐Cimmerian orogenies in the Yunkai massif is related to this Upper Triassic event, with the activation of the 230–200 Ma greenschist facies dextral shear zones (i.e., D2 in this study, see also Ni et al., 2019; Y. J. Wang, Fan, Cawood, et al., 2007; Y. J. Wang et al., 2021; K.‐J.…”

“…Thrust sheets and folds associated with the Indosinian convergence were propagated northward into the South China Block only after 245 Ma (J. W.-X. Yang et al, 2021).…”