Petrogenesis and Tectonic Setting of the Early and Middle Jurassic Granitoids in the Chaihe Area, Central Great Xing’an Range, NE China

To ascertain the Early-to-Middle Jurassic tectonic setting in central Great Xing’an Range, this study investigated Early and Middle granitoids exposed Chaihe area Range based on isotopic chronology petrogeochemistry. The results of show that have emplacement ages 179–172 Ma. Moreover, are high-K calc-alkaline unfractionated I-type fractionated granitoids, respectively. magma sources both originated from partial melting newly accreted lower crustal basaltic rocks. Meanwhile, were mixed with mantle-derived materials or ocean-floor sediments formed by dehydration metasomatism subducted slabs. subduction environment oceanic crust, which Mongol-Okhotsk plate was southward beneath Eerguna blocks. Siberian began to collide converge northeast China during Jurassic.