Late Paleozoic to Mesozoic tectonic transition in northeastern Eurasia: Constraints from two island arc magmatic belts in eastern NE China

Abstract Since the Paleozoic, tectonic evolutionary process of eastern Eurasia has been affected by at least three paleo-ocean regimes: Paleo-Asian Ocean, Mongol-Okhotsk and Paleo-Pacific Ocean. However, transition among these ocean regimes is not well understood. Recently, Heilongjiang Ocean was proposed to play an important role during from regime (and later Ocean) regime. Here we report on a new combined study petrological, geochemical, geochronological data biotite–plagioclase gneisses Qinglongcun Complex in west Jiamusi-Khanka Block better understand evolution this period. The results show that protoliths are medium-K calcalkaline rhyolites were derived volcanic island arc environment related paleo-oceanic subduction occurred ca. 260 Ma. Integrated with previous studies Permian arc-affinity rocks within Block, identified two magmatic belts ages 290 Ma east margins respectively. belt Early–middle Permian, which provided driving force for opening Subduction middle–Late resulted belt. These provide key evidence understanding late Paleozoic early Mesozoic.