Archean relic body at lower crust in Sulu area:Evidence from magnetic data  

作　　者：WU Qifan1,2, LU Fengxiang3, LIU Qingsheng3, ZHENG Jianping3, WANG Maoji2 & WU Wenli4 1. Department of Engineering Physics, Tsinghua University, Beijing 100084, China 2. Aero Geophysical Survey & Remote Sensing Center, Beijing 100083, China 3. China University of Geosciences, Wuhan 430074, China 4. Institute of Geophysical & Geochemical Exploration, Langfang 065000, China 

出　　处：《Chinese Science Bulletin》2003年第6期589-593,共5页

基　　金：supported by Aero Geophysical Survey and Remote Sensing Center,Laboratory of Quantitatively Prediction and Exploration Assessment of Mineral Resources,Ministry of Land and Resources of China and Ministry of Land and Resources of China(Grant No.20001010203).

摘　　要：After the new 1︰1000000 aero magnetic data were processed and the three-dimensional inversion work was carried out, a vast high magnetic body northwestward was discovered. The magnetic body is located at the depth of about 20 km on the west side of Tanlu fault and at about 25 km on the east side of Tanlu fault beneath the Sulu area. There is a difference of vertical distance of 3—5 km in depth between both sides. We think that the magnetic body is an Archean metamorphic plate and belongs to the North China block. The discovery of the magnetic body is significant for us to reconstruct the structure model of the Sulu orogenic belt, delineate the suture of collision between the North China block and the Yangtze block, and estimate the depth of slipping surface when the eastside of Tanlu fault moved northward.After the new 1︰1000000 aero magnetic data were processed and the three-dimensional inversion work was carried out, a vast high magnetic body northwestward was discovered. The magnetic body is located at the depth of about 20 km on the west side of Tanlu fault and at about 25 km on the east side of Tanlu fault beneath the Sulu area. There is a difference of vertical distance of 3—5 km in depth between both sides. We think that the magnetic body is an Archean metamorphic plate and belongs to the North China block. The discovery of the magnetic body is significant for us to reconstruct the structure model of the Sulu orogenic belt, delineate the suture of collision between the North China block and the Yangtze block, and estimate the depth of slipping surface when the eastside of Tanlu fault moved northward.

关 键 词：苏鲁地区 地壳下层 太古代残余体 地球物理调查 区域性磁场 三维反演 苏鲁造山带 郯鲁断裂带 大别-苏鲁超高压变质带 

分 类 号：P318[天文地球—固体地球物理学]