中国东部大兴安岭重力梯级带域地球物理场特征及其成因  

Geophysical characteristics of Daxinganling gravitational gradient zone in the East China and its geodynamic mechanism

作　　者：杨宝俊[1] 刘万崧[1] 王喜臣[1] 李勤学[1] 王建民[1] 赵雪平[1] 李瑞磊[1] 

机构地区：[1]吉林大学地球物理系,长春130026

出　　处：《地球物理学报》2005年第1期86-97,共12页Chinese Journal of Geophysics

基　　金：国土资源部"十五"重点科技攻关项目 (2 0 0 0 10 10 2 0 4);中国石油化工总公司"十五"重点科技攻关项目 (P0 0 0 0 2 0 2 2 )资助

摘　　要：综合利用 7条地学断面 (GGT)资料研究了大兴安岭重力梯级带附近的壳幔地球物理特征模式 .分析了形成上述地球物理特征的 3种因素 :东亚大陆边缘周边三大板块运动、地幔流运动和地幔热柱 .对大兴安岭重力梯级带的重力异常的正演拟合结果表明 ,壳幔物质密度不均匀和莫霍界面起伏造成该带的重力异常 .地应力场的综合作用产生了该重力梯级带系列地球物理特征 .最后 ,探讨了大兴安岭重力梯级带成因机制 ,提出了以“挤”、“涌”为动力的“三结点模型” .Integrating geophysical data 7 Geoscience transects (GGT), we make the study on the geophysical characteristics model of crust and mantle along the Daxinganling gravitational gradient belt. We analyses 3 kinds of factors to generate the above-mentioned geophysical characteristics, such as the mantle current movement, the mantle thermal plume and the three plates movement surrounding around the continental margin. The forward and fitting results of gravity anomaly along Daxinganling gravitational gradient belt demonstrate the combination of the Earth material density variation in the crust and upper mantle and the Moho interface fluctuation leading to the gravity anomaly of the belt. The stress fields crossed at the continental margin in the East Asia and formed a series along the geophysical characteristics of the gravitational gradient zone. At last, we study the origin of the gravitational gradient zone along Daxinganling Mountain-Taihang Mountain-Wuling Mountain, and present the triple-junction model with dynamic force of compression stress and the upwelling action.

关 键 词：大兴安岭-太行山-武陵山 重力梯级带 东亚大陆边缘地带 板块运动 三结点模型 

分 类 号：P314[天文地球—固体地球物理学]