Petrotectonic assemblages and temporal-spatial framework of the Late Paleozoic-Early Mesozoic intrusions in the Qimantage Corridor of the East Kunlun belt

Abstract：Based on field geology, petrographic characteristics, spatial and temporal distribution and isotopic dating of the Late Paleozoic-Early Mesozoic intrusions in the Qimantage Corridor of the East Kunlun orogenic belt, the authors have recognized five tectono-magmatic stages and five intrusive belts. Magmatism in this area can be divided into the Early-Middle Permian, Late Permian-Middle Triassic, Middle Triassic, Late Triassic and Late Triassic-Early Jurassic stages. In the Early-Middle Permian stage, such assemblages as granodiorite + monzogranine + porphyroid monzogranite, quartz-diorite + porphyroid quartz-diorite and diorite + quartz-diorite were produced. The monzogranite + porphyroid monzogranite + syenogranite assemblage was formed in the Late Permian-Mmiddle Triassic period, the diorite + quartz-diorite + tonalite + granodiorite assemblage was emplaced in the Middle Triassic period, and the Late Triassic intrusions were composed of the quartz-monzodiorite + granodiorite + porphyroid monzogranite + syenogranite assemblage. The representative intrusion assemblage produced in the Late Triassic- Early Jurassic period is the quartz-monzonite + porphyroid syenogranite + alkali feldspar granite. These igneous assemblages are regularly distributed in the corridor and seem to be the key to revealing the tectonic evolution of the East Kunlun orogenic belt.