大兴安岭中段晚三叠世构造属性研究

This research investigates the issue of Late Triassic tectonic property in the middle segment of the Da Xing'an Mountains by using the newly found Late Triassic sedimentary rocks and syenogranite. The forming conditions and tectonic background of the Late Triassic sedimentary rocks are deduced through their provenance analyses. The origins and tectonic settings of Late Triassic syenogranite are determined by its petrographic, lithogeochemical and geochronological studies. This program is finally expected to determine the Late Triassic tectonic settings of the middle segment of the Da Xing'an Mountains, those which will provide the direct evidence for the Mesozoic Tectonic evolution in the region of Da Xing'an Mountains and Northeast Asia.

针对大兴安岭中段晚三叠世的构造属性问题，以新近发现的上三叠统沉积岩、晚三叠世正长花岗岩为研究对象，采用多种物源分析揭示上三叠统沉积岩的物源特征及物源区性质，进而反演沉积环境及构造背景；岩相学、岩石地球化学及年代学相结合，确定正长花岗岩的起源及构造背景。项目预期将揭示大兴安岭中段晚三叠世时期的大地构造属性，该研究成果将对大兴安岭乃至东北亚地区中生代构造演化细节提供直接的科学依据。