2.09 Ga mafic dykes from Western Shandong, Eastern block of North China Craton, and their tectonic implications

摘要

A group of mafic dykes was discovered in the Menglianggu area, the Western Shandong Province located in the Eastern block of the North China Craton. The dykes are chlorite-actinolite schists, which commonly underwent greenschist facies metamorphism. LA-ICP-MS zircon U-Pb analysis reveals that the magmatic precursors of these dykes were emplaced at 2084 +/- 15 Ma and preserved a group of similar to 2.5 Ga inherited zircons, which are consistent with the monzogranitic gneisses that surround the dykes.