Yanshanian Magma-tectonic-Metallogenic belt in East China of Circum-Pacific Domain (I): Igneous rocks and Orogenic Processes

摘要

Yanshanian igneous rocks in the East China, on an orogenic belt scale, are characterized by the continental marginal arc in petrology and geochemistry as Andes and West USA, except for the Hercyn-type biotite-two mica-muscovite granite belt in the Nanling region. Three segments of the Yanshanian igneous rocks along the belt are recognized. In terms of magma-tectonic event se- Quence, the north, middle and south segments have counter-clockwise (CCW), clockwise (Cw) and Ccw + c pTt paths of the orogenic process, respectively.