基于航磁资料的大兴安岭南部区域成矿构造填图尝试

摘要

The Da Hinggan Mountains is one of the very important metallogenic belts in China in that it has the condition of large-scale mineralization and prospecting potential. The thorough study of the large faults, sub-faults and basement structure system of southern Da Hinggan Mountains is an important step for probing into the control of the tectono-magmatic rocks and mineralization in this area.In this paper the authors conducted the processing and interpretation of the aeromagnetic data obtained from southern Da Hinggan Mountains. The authors found the deep great faults in NE, EW, NNE and NW directions, which indicate the deep base-ment structure characteristics of this area. The authors ascertained the locations of volcanic mechanisms, and analyzed the regional geological-structural characteristics of the Da Hinggan Mountains.The authors revealed the positive magnetic anomalies and anoma-ly gradient belts distributed in linear and plane shapes,which indicate the activities of magmatic rocks.The favorable areas of metallic mineralization were also investigated.This study provides some basic information for the further research on regional geology,struc-tural characteristics and mineral resources prospecting in southern Da Hinggan Mountains.%大兴安岭地区是中国重要的成矿区带之一,具备大规模成矿的条件和找矿潜力.对大兴安岭地区的大型断裂、次级断裂及基底构造系统深入研究是揭示控制该地区构造-岩浆活动和成矿作用的重要内容.对大兴安岭南部的航磁数据进行处理和解释,查明了研究区北东向、东西向、北北东向和北西向深大断裂为主的深部基底构造特征,圈定了火山机构分布位置,分析了大兴安岭南部区域构造特征,揭示了反映岩浆岩活动的线性或面状正磁异常和磁异常梯级带,探讨了研究区金属成矿的有利区带.为大兴安岭南部地区的区域地质、构造特征三维地质填图、找矿远景区的圈定提供了基础性信息.