Abstract:

Obvious differences in thrust directions, structural styles, and deformation levels are observed at different structural segments of the Hechi-Yishan foldthrust zone as indicated by the results of geological cross-sections structural explanations and the calculated amounts of structural deformation. In Hechi and Yishan sections, with a middle tectonic deformation intensity, thrust-nappe structure and imbricate structure thrusting from north to south develop respectively. In Liucheng section, the largest structural deformation quantity, and imbricate structures thrusting from south to north are discovered. In Yingshan structural segment, a gentle deformation and normal strike-slip flower-shaped structures with thrusting from north to south are observed. Lateral and vertical transform zones in the Hechi-Yishan fold-thrust belt are assumed to have regulative effects on these differences. On the basis of deformation characteristics in different segments and the tectonic setting, deformation mechanism of the fold-thrust zone was discussed.


Key words: structural style, accommodation zone, fold-thrust zone, segmentation, Hechi-Yishan