Abstract:The tectonic activity analysis of the micro-terranes in the Wuyi block is a window to understand the tectonic evolution of the Cathaysia block. As being an important boundary that divided the South Wuyi terrane and the North Wuyi terrane, the Nanping-Ninghua tectocnic belt played a crucial role in understanding the tectonic evolution between the South Wuyi terrane and North Wuyi terrane. However, the previous researches and understandings of the metamorphic volcanic rocks in the Nanping-Ninghua tectonic belt are still controversial, which limits our understanding of the tectonic properties of the Nanping-Ninghua tectonic belt. Therefore, in this paper, we mainly focus on the study of the meta-volcanic rocks by field route geological survey, geochronology dating and isotopic geochemistry determination in the Nanping-Ninghua tectonic belt. Combined with the previous research, we suggested that the metamorphic volcanic rocks in the Nanping-Ninghua tectonic belt were mainly formed at 756-720 Ma in an active continental margin or island arc environment, which indicate that the Nanping-Ninghua tectonic belt may represent a nearly east-west island arc volcanic belt between the South Wuyi terrane and North Wuyi terrane in the Nanhua period. Combined with the convergence polarity of the south-north offset reflected by the tectonic deformation in the tectonic belt, we proposed that there may still be ocean-land collision or land-land merging between the South Wuyi terrane and the North Wuyi terrane in the Nanhua period, which indicates that the multi-micro-terranes and multi-stage collision may be major characteristics for the tectonic evolution process in the Cathaysia block.
