Zircon SHRIMP U-Pb age of Yinmawanshan and Zhaofang pluton in South Liaoning metamorphic core complex and its geological implications
辽南变质核杂岩饮马湾山和赵房岩体锆石SHRIMP U-Pb年龄及其地质意义

South Liaoning metamorphic core complex was formed due to regional extension and lithosphere thinning in North China Craton during Late Mesozoic. The tectono-magmatic evolution of the metamorphic core complexes can be subdivided into three stages. In the first stage (~130Ma), the detachment fault and ductile shear zone were formed by the regional extension. During the second stage (130~120Ma), the active emplacement of synkinematic granitic plutons influenced the development of detachment fault; at the same time (124Ma), the tectono-magmatic activity reached the peak value; the third stage (~113Ma), granitic intrusions emplaced at the lower plate of detachment fault which had ceased movement. The tectonic evolution of South Liaoning metamorphic core complex provide evidences for the extension and lithosphere thinning of North China Craton in Late Mesozoic. We considered that the emplacement of post-extensional Zhaofang pluton (113Ma) marks the termination of a series of tectono-magmatic activities during regional extension. After 113Ma, the South Liaoning metamorphic core complex, and the North China Craton experienced a regional uplifting and cooling.