Tectonic evolution of the western Jiangnan Orogen: Constraints from the Neoproterozoic igneous rocks in the Fanjingshan region, South China

The Jiangnan Orogen in South China formed through collision between the Yangtze and Cathaysia blocks during the Neoproterozoic. The Fanjingshan Group, located in the western part of the Jiangnan Orogen, consists of the deformed volcano-sedimentary sequences intruded by the ca. 830 Ma S-type granites. The volcanic rocks are mainly composed of rhyolitic tuffs associated with minor basalts. The basalts are rich in LILEs (e.g. Th and U) and LREEs...