皖南乌溪多金属矿区综合电磁法数据集

Comprehensive Electromagnetic Experimental Dataset in Deep Mineralization Mechanism in Wuxi Polymetallic Ore Deposit of Anhui Province, China

乌溪矿区介于长江中下游多金属成矿带与华南成矿带之间。作者为了研究该矿区深部成矿机制,2011年3-11月、2012年10-11月分别对该区域进行了综合电磁法勘探。初次考察过程中,采集了区域出露的主要岩石类型,然后在实验室开展了岩石的物性测定。综合勘探阶段选用3种电磁方法——地面高精度磁法、双频激电法和可控源音频大地电磁法(Controlled Source Audio Magnetotelluric Method, CSAMT),选择垂直于主断裂的北西45o作为测线方向,将测网布设为200m×25m,从而获得关于磁化率、极化率和电阻率等的空间分布数据。其中,地面高精度磁测数据是基于PM-2质子磁力仪采集到的原始磁场数据基础上,进行了日变改正、高度改正和场值平滑处理;激发极化数据是利用双频激电仪选取2 Hz与2/13 Hz频率计算得到的视幅频率值;深部视电阻率数据是基于凤凰公司的V6A系统采集到的不同频率的电磁场数据,进行一维最小二乘反演;对反演得到的数据再次进行正演计算,将计算得到的电磁场数据与采集到的原始数据进行拟合对比,以验证反演结果的准确性。皖南乌溪多金属矿区综合电磁法实验数据集包括:(一)实地测量和实验室分析得到的数据:(1)岩石物性测量数据;(2)实地测量的线与点的GPS数据;(3)地面高精度磁测得到的原始磁场数据和改正后的磁场数据;(4)双频激电法得到的平面视幅频率与视电阻率数据;(5)CSAMT测量的野外施工班报和每天采集到的原始数据。(二)剖分数据:(1)地面高精度磁测法得到的磁场改正数据的剖分结果;(2)双频激电法得到的视幅频率剖分数据;(3)CSAMT法获得的各测线深部视电阻率数据的剖分结果。不同方法采集得到的数据经过剖分处理均可达到25 m×25 m×25 m的空间分辨率。数据集存储为.xls、.grd、cmd、.cms、.cmr.、csv.、.csr和.pdf格式,数据量为31.4 MB(压缩为1个文件,6.86 MB)?该数据集的分析研究成果发表在《地球物理学报》2016年第59卷第11期?

The Wuxi polymetallic ore deposit lies between the middle and lower reaches of the Yangtze River polymetallic metallogenic belt and South China metallogenic belt.To study the deep metallogenic mechanism,a comprehensive electromagnetic prospecting of the area was conducted during the periods of March–November 2011 and October–November 2012.During the initial inspection,the main types of rock exposed in the area were collected,and the physical properties of the rocks were measured in the laboratory.Three different electromagnetic methods were applied in the integrated exploration:the high-precision ground magnetic method,dual-frequency induced polarization method,and controlled source audio magnetotelluric method(CSAMT).The dataset was consisted of two parts.Part 1:raw data collected in situ survey and analysis in the laboratory,including(1)The physical property data of the main rock types exposed in Wuxi polymetallic ore deposit;(2)GPS data of lines and points in situ survey;(3)Raw data and corrected data got in ground precise magnetic survey;(4)Plane amplitude frequency and apparent resistivity data using dual frequency induced polarization method;and(5)CSAMT fieldwork log and raw data in Jingxian,Wuxi,China.Part 2:Split data,including(1)Split results of corrected data using the ground high-precision magnetic survey;(2)Split results of amplitude frequency using the dual frequency induced polarization method;(3)Split results of the deep survey line apparent resistivity using CSAMT method.Different methods of collecting data obtained through the split process can reach 25 m×25 m×25 m spatial resolution.The dataset was archived in.xlsx,.grd,.cmd,.cms,.cmv,.csv,.cmr,.csr,and.pdf formats with the data size of 31.4 MB(compressed into one file,6.86 MB).