The Early Permian assembly of the Jiamusi Massif and Khanka Massif: Evidence from sediment sources

Abstract

The Jiamusi-Khanka Massif is an important tectonic unit of the Central Asian Orogenic Belt in North-east China. Its Late Palaeozoic tectonic properties and the timing of assembly have restricted the understanding of the tectonic evolution process at the eastern segment of the Central Asian Orogenic Belt for a long time. Based on the study of clastic rock petrology and zircon U-Pb chronology of the Early Permian Erlongshan Formation in Mishan, it is clear that the zircon age of the Early Permian Erlongshan Formation in Mishan is mainly Late Palaeozoic, with a major age peak at 300 ± 3 Ma and secondary age peaks at 356 ± 7 Ma and 475 ± 10 Ma.The provenance mainly comes from the magmatic arc source area, and Early Palaeozoic (500-420 Ma) detrital zircons mainly come from the south-east margin of Jiamusi Massif, Late Palaeozoic (400-270 Ma) detrital zircons mainly come from the eastern margin of Jiamusi Massif and the northern margin of Khanka Massif.Among them, detrital zircons of a special age group 330-310 Ma come from the north of Khanka Massif, while 490-470 Ma detrital zircons which are common in the Early-Middle Permian strata of Khanka Massif come from Jiamusi Massif. Combined with the evidence of petrology and palaeontology, this paper believes that the Early Permian Jiamusi Massif and Khanka Massif should be a unified Massif, that is, Jiamusi-Khanka Massif.