【摘要】 位于大兴安岭西北部的中新生代盆地群(海拉尔、根河、漠河),其构造受到大兴安岭断裂、德尔布干断裂的控制,西北方向的蒙古-鄂霍茨克缝合带、南部西拉木伦河延吉缝合带甚至更远的西太平洋板块运动、印度板块运动以及黑龙江中西部微板块间拼合等区域构造应力场叠加作用在该盆地群基底产生了复杂的深部构造特征.本文利用沿盆地群实施的4条(1000余公里、94个测点)MT剖面处理解释的地电学结构,得到盆地群基底电性结构沿北西南东方向分带的特征.引人物理量"低阻化作用"借以描述盆地基底物性的变化.综合分析表明,盆地群基底电性结构因受到软流圈热物质作用可能在继续演化.更多还原

【Abstract】 The structures of the Mesozoic-Cenozoic basin groups (Hailar basin,Genhe basin, Mohe basin) lying in the Northwest of the Da Hinggan Ling fault are controlled by the Da Hinggan Ling fault and the Derbugan fault,and the regional tectonic stress field of the Mongol-Okhotsk suture zone in the Northwest of the basin groups,the Xilamulunhe-Yanji suture zone in their southern part,even the movements of the western Pacific plate and the Indian plate far away from the basins and the micro-plates collage zones in the middle and west of Heilongjiang province make a superimposed effect to the bottom of the basin groups,both of which produce the complex deep structure features.Using the geoelectrical structure of the four MT sections (about 1000 km,94 survey points) carried out along the basin groups in this paper,the banding characteristic of geoelectrical structure of the bottom of the basin groups from Northwest to Southeast is obtained."The effect of the low electrical resistance" is introduced to describe the change of the physical feature of the basin bottom.The comprehensive analysis shows that the electrical structure of the bottom of the basin groups perhaps continue to evolve by the effect of the asthenosphere hot material.更多还原