本项目拟通过对额尔古纳地块早中生代（早三叠世-中侏罗世）火成岩的野外地质学、岩石地球化学和锆石U-Pb年代学研究，查明早中生代岩浆作用的时间格架及空间范围；研究额尔古纳地块早中生代不同期次岩浆作用的岩石组合，确定不同时代火成岩组合所反映的构造背景；利用元素-同位素地球化学示踪技术，查明不同时代火成岩的岩浆源区性质及其演化；结合同时代火成岩的空间分布以及不同时代火成岩的成分变化，揭示额尔古纳地块早中生代岩浆作用与蒙古-鄂霍茨克缝合带构造演化之间的关系。

This project studies field geology, petro-geochemistry, and zircon U-Pb geochronology of Early Mesozoic (Triassic-Middle Jurassic) igneous rocks in the Erguna Massif, NE China, with the aim of revealing spatial-temporal framework of Early Mesozoic magmatisms in the region. Based on igneous rock associations with different ages, we recognize the tectonic settings under which they formed. We will use element-isotopic tracing techniques to determine the nature of magma sources for igneous rocks with different ages and their evolution. Based on spatial distribution of coeval igneous rocks and compositional variation of igneous rocks with different ages, we will reveal the relationship between the Early Mesozoic magmatisms in the Erguna Massif and tectonic evolution of the Mongol-Okhotsk suture belt.