Caledonian granite in the western Wuyi area and inversion of the orogenic process

Caledonian granite in the western Wuyi area is divided into the Early Ordovician Magushan superunit, Middle Late Orodvician Fufang superunit, Middle Late Silurian Tangyin superunit and Late Silurian Epo superunit. The Wuyishan superunit association (sequence) made up of the above mentioned superunits occurred with shear anatexis related granitic gneiss, subduction fusion related leucogranite, extensional thermal uplift related migmatitic granite and strike slip related syenogranite respectively in the early collision stage, main collision stage, post main collision stage and syncollision stage in the Caledonian orogenic cycle. The Caledonian orogenic process of the area deduced backward thus may be expressed by a four stage model of early stage compression main stage compression finite extension regional strike slip.