佳木斯地块是兴蒙造山带东段著名的晚泛非期高级变质微陆块，其构造起源及晚泛非期演化历史一直是地学领域研究的热点与争论的焦点问题之一。本项目拟通过对佳木斯地块上新发现的早古生代镁铁质岩浆岩开展精细的年代学、岩石学、矿物学、全岩主量、微量元素和Sr-Nd-Hf同位素、以及锆石原位Hf-O同位素研究，旨在查明该期岩浆作用的形成时代、岩石组合及时空分布规律，确定该期镁铁质岩浆的源区性质、演化过程及构造背景。结合区域早古生代花岗质岩石、晚泛非期麻粒岩相变质作用及其他相关研究成果，探讨佳木斯地块晚泛非期变质-岩浆作用历史、壳-幔作用过程及可能的地球动力学机制。该项研究不仅可以为揭示佳木斯地块构造起源及地质演化历史提供关键证据，而且对理解兴蒙造山带的地壳生长和再造以及深部岩石圈演化具有重要意义。

Jiamusi Block is the famous late Pan-African high-grade metamorphic microcontinent in the eastern segment of the Xing’an-Mongolia Orogenic Belt (XMOB), the tectonic affinity and late Pan-African evolution history of this block have both been subjects of controversy. This project will conduct a precise study of geochronology, petrology, mineralogy, whole rock major elements, trace elements and Sr-Nd-Hf isotopes, and zircon in situ Hf-O isotopes for the newly discovered early Paleozoic mafic magmatic rocks in the Jiamusi Block, in order to (1) investigate the formation timing, rock association and temporal-spatial distribution of the early Paleozoic mafic magmatism; and (2) determine the source nature, magmatic process and tectonic setting of these mafic magmas. In combination with the regional research results of the early Paleozoic granitic rocks, and the late Pan-African granulite-facies metamorphism, this project will further discuss the late Pan-African metamorphic-magmatic history and crust-mantle interaction processes of the Jiamusi Block and their possible geodynamic mechanism. This project not only provides vital evidence for revealing the tectonic affinity and geological evolution history of the Jiamusi Block, but also has important significances for understanding crustal growth and reworking as well as evolution of the deep lithosphere in the XMOB.