摘要
大陆动力学领域今后 10～ 15a的主要科学目标是 ,建立东亚大陆中新生代演化的动力学模型 ,为资源勘查、灾害减轻和环境保护提供新的预测与评价理论。未来 10～ 2 0a会诞生地幔分异作用与岩石圈成因的综合性理论 ,为建立这个理论 ,采用地质学、岩石学探针、地球化学、数字模拟等学科交叉 ,以岩浆构造事件序列和火成岩构造组合为主线 ,探索华北燕山期岩石圈巨量减薄的机制与过程 ,对流地幔物质和热注入陆壳诱发壳幔相互作用、大规模岩浆活动和岩浆热构造变形之间的反馈关系。以岩石圈巨量减薄的深部过程这个视角 ,为华北地区大地构造性质的巨大转换 ,即从稳定的克拉通突发地转变为造山带的“燕山运动”或“大陆活化”提供深部动力学的科学依据。
The main goal of continent dynamics is creating the evolution dynamics model of Eastern Asia continent at the Mesozoic-Cenozoic era, and providing the new prediction and evaluation theory for resources exploring, disaster-reduction, and environmental protection. A general theory of mantle differentiation and lithosphere origin will be created in 10～20 years. For creating this new theory, we will use the main approaches of magmatic-tectonic event sequence and igneous petrotectonic assemblage on the basis of field geological, petrological, and geochemical studies, and numerical modelling. The following topics will be investigated: (1) Mechanism and processes of the large lithospheric thinning in the Jurassic-Cretaceous Yanshanian orogenic belt of North China; (2) Deep crust-mantle processes through input of juvenile materials and heat of mantle into crust; (3) Feedback relationship between large scale magmatism activity and magmatism-heat-deformation; (4) General model for origin and evolution of the orogenic belt and 'Yanshan movement' in North China region which had a long-term tectonically stable cratonic history since the late Archean. Through those studies, we can provide the scientific evidences of deep earth dynamics for the answer of why there is a tremendous change of tectonic situation in North China in the Jurassic-Cretaceous. Namely, provide scientific evidence from deep dynamics for craton changing abruptly to the orogenic belt 'Yanshan movement' or continental activation.
出处
《地学前缘》
EI
CAS
CSCD
2003年第3期41-50,共10页
Earth Science Frontiers
基金
国家自然科学基金重点项目 (4 0 2 3 40 48)
国家地质调查局资助项目 (2 0 0 113900018
K1.4 1 2 )
国土资源部岩石圈项目 (2 0 0 0 10 10 2 0 2 )
科学技术部国际合作项目 (2 0 0 1cb7110 0 2 )
教育部 2 11工程项目
IGCP 43 0项目
关键词
华北地区
燕山期
岩石圈减薄
深部过程
North China region
Yanshanian epoch
lithospheric thinning
deep processes
