长白山地区航磁异常居里面计算及其地质意义
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摘要
利用Parker-Oldenburg界面位场快速反演迭代算法,得到长白山地区居里深度为12. 8～15. 8km,较全球居里深度20 km整体为浅。该区居里面最深处在松江镇右侧,最浅处在长白山与靖宇—临江—抚松一带,与当前地热出露状态符合。结合区域磁场和地质等信息,推断抚松、仙人桥、老三队地区为长白山地区地热远景区。
The iterative algorithm for rapid inversion of potential field at the Parker-Oldenburg interface is used to obtain the Curie depth of 12. 8 ～ 15. 8 km in Mount Changbai region,which is shallower than the global Curie depth of 20 km. The deepest part of the Curie surface is located at the right side of Songjiang town,and the shallowest part is located at Changbai Mountain and Jingyu-Linjiang-Fusong area,which is in accord with the current geothermal exposures. Based on the information of magnetic field and geology,Fusong,Xianrenqiao and Laosandui area are inferred as the geothermal prospecting areas of Changbai Mountain.
The iterative algorithm for rapid inversion of potential field at the Parker-Oldenburg interface is used to obtain the Curie depth of 12. 8 ～ 15. 8 km in Mount Changbai region,which is shallower than the global Curie depth of 20 km. The deepest part of the Curie surface is located at the right side of Songjiang town,and the shallowest part is located at Changbai Mountain and Jingyu-Linjiang-Fusong area,which is in accord with the current geothermal exposures. Based on the information of magnetic field and geology,Fusong,Xianrenqiao and Laosandui area are inferred as the geothermal prospecting areas of Changbai Mountain.
引文
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[6]吴招才,高金耀.南海北部陆缘的磁异常特征及居里面深度[J].中国地质大学学报,2010,35(6):1060-1068.WU Zhao-cai,GAO Jin-yao.Characteristic of magnetic anomalies and Curie point depth at northern continental margin of the South China Sea[J].Journal of China University of Geosciences,2010,35(6):1060-1068.
[7]高德章.东海及邻区居里面分析[C]//中国地球物理学会第二十八届年会.北京.2012:720.GAO De-zhang.Analysis of Curie interface in the East Sea and adjacent regions[C]//The 28th annual meeting of the Chinese geophysical society.Beijing.2012:720.
[8]南方舟,徐亚,梅金顺.基于磁异常数据的居里面反演方法研究[J].地球物理学进展,2015,30(3):1078-1084.NAN Fang-zhou,XU Ya,MEI Jin-shun.Inversion methods of the depth of Curie point based on magnetic anomaly data[J].Progress in Geophysics(in Chinese),2015,30(3):1078-1084.
[9]申宁华.界面位场异常的快速正反演计算及其应用[J].物探化探计算技术,1990,12(1):4-12.SHEN Ning-hua.Fast forward and inverse calculation of interface potential field anomalies and application[J].Computing Techniques for Geophysical and Geochemical Exploration,1990,12(1):4-12.
[10]Parker R L.The rapid calculation of potential anomalies[J].Geophysical Journal,1972,31(4):447-455.
[11]Oldenburg D W.The inversion and interpretation of gravity anomalies[J].Geophysics,1974,39(4):526-536.
[12]汤吉,赵国泽,王继军,等.基于地下电性结构探讨中国东北活动火山形成机制[J].岩石学报,2006,22(6):1503-1510.TANG Ji,ZHAO Guo-ze,WANG Ji-jun,et al.Formation mechanism of active volcanoes in Northeast China based on underground electrical structure[J].Acta Petrologica Sinica,2006,22(6):1503-1510.