分布在大兴安岭北部额尔古纳-兴安地块中强烈变质变形的岩石长期被认为是新元古代形成的佳疙瘩群变质岩系。随着高精度测年技术的发展，发现"佳疙瘩群"变质岩系形成时代部分为前寒武纪，但大部分为古生代-早中生代。本项目依据大兴安岭北段"佳疙瘩群"变质岩系形成与演化的复杂特性，在野外宏观地质调研与室内显微岩相学研究基础上，利用现代分析测试技术，进行岩石地球化学、矿物化学以及同位素年代学等研究，厘清"佳疙瘩群"中各类变质岩系的原岩建造-形成时代-构造背景-变质变形叠加改造过程；建立各类变质岩系原岩起始状态-变质-变形热事件演化序列；甄别与解析前寒武纪结晶基底型、早古生代副变质岩型和晚古生代-早中生代正变质岩型等"佳疙瘩群"变质岩系的成因；揭示大兴安岭北部"佳疙瘩群"各类变质岩系的形成与前寒武纪结晶基底构造属性、区域构造格局、古生代期间地壳结构的耦合关系，为区域成矿地质背景分析提供重要的地质依据。

Located in the Erguna and Xing'an massifs in the northern part of Great Xing'an Range, the strongly metamorphic and deformed rocks have long been considered to be Neoproterozoic Jiageda Complex. The development of dating technology with higher precision allow us to find that "Jiageda Complex" is partly Precambrian, but mostly it is Paleozoic to Early Mesozoic in age. Due to the complexity of the forming and evolution of "Jiageda Complex" in the north part of Great Xing'an Range, our project is based on field geological survey and microscopic petrography research, using modern analytical techniques to study geochemistry, mineral chemistry and isotope chronology, understanding protolith formation, its forming age, its tectonic setting and the processes of the deformation, metamorphism, superimposition and transformation of each metamorphic type, establishing the initial state-metamorphic-deformation thermal event sequence of all the metamorphic types of "Jiageda Complex". Also we can examine, distinguish and elucidate genesis of Precambrian crystalline basement type, early Paleozoic para-metamorphic type and late Paleozoic-early Mesozoic ortho-metamorphic type of "Jiageda Complex" and reveal the genesis relationship with the tectonic attribute of Precambrian crystalline basement, its tectonic framework and the Paleozoic crustal structure in the northern part of Great Xing'an Range so as to provide significant geological basis for the analysis of regional metallogenic geological setting.