Deformation characteristics and tectonic evolution of the Taoxi Dome in southern Wuyishan Mountains on the boundary of Fujian and Jiangxi provinces

The Taoxi dome is composed of inner core, intermediate layer and cap rock, each of which developed various structural deformations, including rheologic, ductile, ductile-brittle and brittle deformation(fracture). With the tectonic deformations of each structure as the research targets, this paper discussed the uplift process of the dome through analyzing deformation characteristics, movement modes and their relationships. The forming mechanism and tectonic evolution of the dome were expounded based on the depositional events, magmatism and tectonic movement. Out study shows that the Taoxi dome started to uplift at the Caledonian period(end of Silurian)and ascended in a large scale during the period from the Variscan(Late Permian)to the Indosinian(Middle Triassic), followed by inherited activities in the Yanshanian and later, with anti-clockwise rotation uplift in the main uplift period(Variscan-Indosinian). The long-term uplift of the dome may be the leading reason for exposure of the Paleoproterozoic crystalline basement in the study area.