Confirming of the Heilongjiang ~500Ma Pan-African khondalite belt and its tectonic implications

Abstract

The basement rocks in NE China, including Mushan Group in Jiamusi Block, Xinghuadukou Group in the Xing' an Block, constitute a khondalitic sequence of sillimanite- and garnet-bearing gneisses, hornblende-plagioclase gneiss and felsic paragneisses. Zircon U-Ph dating of the garnet-sillimanite gneiss samples from Erguna, Xing' an and Khanka blocks indicates high-grade metamorphism occurred at similar to 500Ma, where several detrital zircon grains whose ages extend between 600Ma to 850Ma. The Pan-African high-grade metamorphism with magmatism events were obtained from all the blocks in NE China, including the Erguna, Xing' an, Songliao and Jiamusi-Khanka blocks, establish a over 1300km Pan-African khondalite belt in NE China, named here the Northeast China Khondalite Belt'. The results from this study provide new idea for researching the tectonic affinity and plate evolution in the NE...