Balanced structural interpretation on fold and thrust belts has been considered to be one of the powerful tools in analysing orogenic belts and their foreland fold and thrust belts, but its tectonic significance for tectonic vergence has not been investigated systematically. By means of multiple restoration, the paper deals with shortening of multi-duplexes, duplexes and thrust imbrication, as well as that of foreland basins in NW Zhejiang. The relationship between shortening and spatial distribution of the structural styles in NW Zhejiang foreland fold-thrust belt reveals complexity in folding-thrusting process in the study area, which records a continuous change from initial stage to development and top level, then to the end in the orogenesis and its compressional process. By calculating the shortening and other synthetic analysing, the authors have investigated that the tectonic shortening decreases from southeast to northwest. Together with the spatial-temporal distribution of the structural styles in NW Zhejiang foreland fold and thrust belt, the authors conclude that the tectonic shortening decreasing is compatible to the deformational decreasing of NW Zhejiang foreland fold and thrust belt. Balanced structural interpretation on fold and thrust belts provides significant constraints on the tectonic vergence together with other tectonic analysis, which demonstrates that the NW Zhejiang foreland folding-thrusting is probably due to a significant orogenesis that happened in NW Zhejiang during the early Mesozoic time.
Xiao Wenjiao,Li Jiliang,Sun Shu et al. BALANCED STRUCTURAL INTERPRETATION AND ITS CONSTRAINTS ON TECTONIC VERGENCE OF FOLD AND THRUST BELTS: A CASE STUDY FROM NW ZHEJIANG, CHINA[J]. Chinese Journal of Geology, 2000, (3): 257-266.