CAJ | 학술논문

安徽省铜陵地区是我国著名的矿集区之一，是长江中下游成矿带的重要组成部分。为研究其深部结构，SinoProbe-03项目部署了6条大地电磁剖面。通过数据维性分析，表明该区深部2D/3D构造特征明显，进行3D反演是必要的。通过挑选适当的测点和频域数据，设计合理的参数，利用 WSINV3DMT程序，进行了大地电磁3D反演研究，得到了铜陵矿集区3D电性模型；利用模型响应与实测数据的拟合对比对反演结果进行了评价，表明所选反演模型整体可被接受，但部分区域精度低。该结果的剖面切片与2D反演模型相比，整体结构一致，局部存在差异；利用不同深度、不同方向的空间切片，讨论了该3D反演模型的电性结构及其所揭示的铜陵矿集区构造格局，浅部的局部电性差异大于深部；平面的电性分布显示了一定的分区特征；垂向电性分布显示出一定的分层特征；高阻体的分布代表着侵入岩的活动范围；深部的低阻区反映了该段下地壳未受到大规模岩浆的扰动。
안휘성동릉지구시아국저명적광집구지일，시장강중하유성광대적중요조성부분。위연구기심부결구，SinoProbe-03항목부서료6조대지전자부면。통과수거유성분석，표명해구심부2D/3D구조특정명현，진행3D반연시필요적。통과도선괄당적측점화빈역수거，설계합리적삼수，이용 WSINV3DMT정서，진행료대지전자3D반연연구，득도료동릉광집구3D전성모형；이용모형향응여실측수거적의합대비대반연결과진행료평개，표명소선반연모형정체가피접수，단부분구역정도저。해결과적부면절편여2D반연모형상비，정체결구일치，국부존재차이；이용불동심도、불동방향적공간절편，토론료해3D반연모형적전성결구급기소게시적동릉광집구구조격국，천부적국부전성차이대우심부；평면적전성분포현시료일정적분구특정；수향전성분포현시출일정적분층특정；고조체적분포대표착침입암적활동범위；심부적저조구반영료해단하지각미수도대규모암장적우동。
Tongling area in Anhui Province is one of the most famous ore districts in China.It is an important part of the Middle-lower Yangtze River metallogenic belt.To probe the deep crust structure beneath the Tongling ore district,six magnetotelluric (MT)sounding profiles have been deployed in the SinoProbe-03 Project.The analysis of the data dimensionality shows the obvious 2D/3D characteristics for the deep structure of the region.Therefore a 3D inversion is demanded.After sites data select and frequencies decimation,the WSINV3DMT code is used with a reasonable parameter design to obtain the 3D conductivity structure.The model is proved to be a acceptable one by a comparison between the observed data and the model response.The results show the framework of the 2D profiles extracted from the 3D model is consistent with the 2D inversion model except several detailed differences. The electrical characteristics and structure framework of the 3D model is discussed by slices of the model with different depth and different orientation.The local electric difference of the shallow is grater than the deep;the electrical distribution shows a certain degree of segmentation feature in the plane and layered characteristic in the vertical;the distribution of the high resistivity bodies show the range of of the intrusive rock and the deep low resistivity region shows the area of undisturbed lower crust.