燕山运动的深部过程与大规模成矿

Deep Processes and Large-Scale Mineralization of the Yanshanian Movement

以重建太平洋板片漂移历史为切入点,以期揭示燕山运动深部过程与大规模岩浆活动及金属成矿作用的内存联系。研究内容主要包括:厘定太平洋与伊泽纳吉板块间扩张洋脊的运动历史;探究洋脊俯冲对长江中下游燕山期岩浆活动和金属成矿作用的控制机理;系统阐述中国东部燕山期A型花岗岩的成因,探讨其对稀有金属成矿的制约;利用地震资料揭示地幔中新特提斯、太平洋俯冲板片的残片;反演华北典型地区高镁埃达克岩形成的深部过程,探讨古太平洋俯冲对华北克拉通减薄的制约;实验模拟流体和熔体对成矿元素的溶解和运移,揭示其化学和动力学机制,为探讨中国东部燕山期大规模岩浆活动和成矿作用的深部过程提供理论支撑。

This project aims to reconstruct the drifting history of the Pacific plate and reveal the relationship between deep processes and large-scale magmatism/mineralization of Yanshanian movement. In detail,the research content of this project mainly includes： Trace the drifting history of the spreading ridge between the Pacific and the Izanagi plates; Study the controlling mechanism of ridge subduction on the magmatic activities and metallizations in the middle and lower regions of the Yangtze River belt during the Yanshanian period; Discuss the genesis of Yanshanian A-type granite in eastern China and its effect on rare metal mineralization; Identify the fragments of subducted Neo-Tethys and Pacific subduction plates inside the mantle based on seismic data; Reveal the deep processes of high-Mg adakite formation in typical areas in north China and discuss the constraints of paleo-Pacific subduction on the destruction of the North China Craton; Simulate the dissolution and migration processes of ore-forming elements related to fluids and melts,and reveal the chemical geodynamic mechanism behind the deep process of large-scale magmatism and mineralization in eastern China during the Yanshanian period.