Intracontinental tectonics in the South China block : example of the Xuefengshan belt

Abstract : Detail field observations indicate that the Xuefengshan Belt can be divided into a Western OuterZone, characterized by km-scale box-fold structures, and an Eastern Zone, separated from theWestern Outer Zone by the Main Xuefengshan Thrust. In the Eastern Zone, NW verging folds coevalwith a pervasive slaty cleavage and a NW-SE trending lineation are the dominant structure. Fromwest to east, the dip of the cleavage surface exhibits a fan-like pattern. Basement rocks are sparselylocated around some Triassic plutons. The rocks of the Xuefengshan Belt are generally ductilelydeformed but weakly metamorphosed, however, below this upper crustal level, a high straindecollement accommodates the difference of deformation between the sedimentary and the basementrocks. The architecture of the Xuefengshan Belt results from polyphase deformation: the first one(D1) is characterized by a top-to-the-NW shearing. The second one (D2) corresponds to a backfoldingand back-thrusting stage. The last phase (D3) is a NW-SE shortening event associated withupright folds with vertical axial plane cleavages. Combined with geochronological data, theXuefengshan Belt is interpreted as an Early Mesozoic intracontinental orogen, which possiblyoriginated from the continental underthrusting to the SE of a piece of the South China block inresponse to the far-field effect of the northwest directed subduction of the Paleo-Pacific plate.
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Yang Chu. Intracontinental tectonics in the South China block : example of the Xuefengshan belt. Earth Sciences. Université d'Orléans; Institute of geology and geophysics, Chinese academy of sciences, 2011. Chinese. ⟨NNT : 2011ORLE2019⟩. ⟨tel-00626808v2⟩

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