A-type granite is anorogenic, anhydrous and alkaline granite and has unique mineralogical, petrological and geochemical characteristics, which is considered to be emplaced in post-orogenic, within-plate or plume-related extensional setting. A-type granites and related alkaline rocks imply important information of geodynamics and are the key to understand the growth of continental crust, the lithospheric evolution and the development of regional tectonics. Late Mesozoic A-type granites and related alkaline rocks are widespread in the eastern North China craton. Previous studies and our recently published data show that they formed via a complex process involving mixing of magmas derived from mantle and upper and lower crust sources, crystal fractionation and infracrustal melting during Early Cretaceous (130-110 Ma). On the basis of the study of regional geology, it is suggested that the A-type granites and related alkaline rocks were formed in an extensional setting and were the shallow responses to the lithospheric thinning and decratonization, which indicate the peak time of lithospheric thinning and destruction of the North China craton.
|Translated title of the contribution||Early Cretaceous A-type granites in the Eastern North China block with Relation to destruction of the craton|
|Number of pages||11|
|Journal||Diqiu Kexue - Zhongguo Dizhi Daxue Xuebao/Earth Science - Journal of China University of Geosciences|
|Publication status||Published - Jan 2009|
- A-type granite
- Early Cretaceous
- North China craton