长江中下游成矿带东北段盆岭地区壳幔结构与各向异性特征重构

As a result of continental convergence in late Jurassic, the Basin-Mountain Regions in the northeastern part of the Middle-Lower Yangtze Metallogenic Belt is an ideal place for the studying of the deep tectonic background and the magmatic activity process for the formation of this metallogenic belt. We propose to deploy a total of 25 three-component broadband seismometers in the study area. With the integrated data set recorded by our instruments and obtained from the Chinese National Seismic Networks, regional seismic networks and temporary portable seismic arrays, we try to reconstruct the crustal and upper mantle velocity models beneath the Basin-Mountain Regions and the adjacent areas in the northeastern part of the Middle-Lower Yangtze Metallogenic Belt by using the joint inversion of receiver function and the surface wave dispersion. Also, with the receiver function waveform data covering full azimuths, we plan to reconstruct the anisotropy and the attitude of the subsurface of the crust in the study region. By combing the mantle anisotropy information from other studies, we are capable of discussing the tectonic property and the deformation relationship of the crust and mantle as well as the magmatism style and mechanism. This project will provide us with valuable geodynamic evidences for the intra-continental deformation and the metallogenic mechanism of the study area.

长江中下游成矿带东北段盆岭地区是晚侏罗世大陆汇聚的结果，是研究成矿带形成的深部构造背景及岩浆作用过程这一重要地球动力学问题的理想地区。本项目拟在研究区域布设25台流动宽频带地震仪，并收集长江中下游成矿带东北段盆岭地区国家地震台网、区域地震台网和流动地震台站资料，提取远震接收函数和远震面波频散信息。采用接收函数与面波频散联合反演方法重构长江中下游成矿带东北段盆岭地区及邻区的壳幔结构模型；并利用远震接收函数全方位波形数据，通过非线性反演重构该地区地壳各向异性及界面产状特性信息，结合地幔各向异性研究的结果，探讨该地区壳幔结构特征、壳幔形变关系及岩浆作用方式与机制，从而为陆内形变及该地区成矿机制研究提供地球动力学依据。

长江中下游成矿带东北段盆岭地区是晚侏罗世大陆汇聚的结果，是研究成矿带形成的深部构造背景及岩浆作用过程这一重要地球动力学问题的理想地区。利用P波接收函数与面波频散联合反演获得研究区壳幔速度结构信息、SKS分裂获得研究区壳幔各向异性信息、S波接收函数方法获得研究区LAB信息，以探讨该地区壳幔结构特征、壳幔形变关系及岩浆作用方式与机制，从而为陆内形变及该地区成矿机制研究提供地球动力学依据。在研究区补充布设了三期共计68个宽频带地震台站记录地震数据，并收集到相关省局数字地震台网及有关研究机构在研究区及邻区布设的宽频带流动地震台站数据，包括国家地震台网固定台站数据、中国地质科学院地质研究所布设宽频带剖面数据等，开展了P、S波接收函数、P波接收函数与面波频散联合反演及各向异性等方面的研究工作。