The Late Paleozoic continental margin tectonic evolution at the eastern margin of the Jiamusi Block

The Jiamusi Block, one of the micro-continental blocks in NE China, is located at the eastern margin of the Eurasia. The Late Paleozoic magmatic and sedimentary evolution of the eastern margin of the Jiamusi Block provide the key evidence for understanding the transition from a passive to an active continental margin at the eastern margin of the Eurasia. New geochronological and geochemical studies indicate that the sandstones in the Middle Devonian Heitai Formation formed in a passive continental margin setting. And the rhyolite in the Laotudingzi Formation overlying the Heitai Formation formed in the same tectonic setting to that of the Heitai Formation. The sandstones from the Late Carboniferous Zhenzishan Formation formed in an active continental margin setting. The andesite from the Early Permian Erlongshan Formation and the other kinds of Early Permian igneous rocks from the adjacent areas formed in an active continental margin setting. The Late Paleozoic sedimentary strata also show the characteristic of the transition from shallow marine facies to continental facies. Thus, the transition from a passive to an active continental margin in the Jiamusi Block occurred during Middle Devonian to Late Carboniferous, which provides key information for the process of the Mongol-Okhotsk oceanic subduction-accretion beneath the Eurasia during the Late Paleozoic.