CAJ | 학술논문

南戈滩矿区位于青海省都兰县柴达木盆地东南部，是一个与闪长玢岩有关的矽卡岩型铁多金属矿床。以闪长玢岩岩脉为中心，矿床分为南北2个矿带。矿体赋存在断裂蚀变带中，闪长玢岩脉、矽卡岩化带、矿体和断裂产出一致。对矿区不同的岩（矿）石进行了磁性和电性参数的测定和统计。统计结果表明：矿体的磁性强、极化率高、电阻率低；而围岩的磁性低、极化率低、电阻率高。矿体和围岩存在明显的物性差异，为在本区开展磁法和电法工作提供了物性前提。通过在矿区开展1∶1万磁法和激电法扫面工作，圈定了3处磁异常和1条激电异常带。在磁、电异常重合的地段布设了3条SIP频谱激电测深剖面，圈定了3个SIP极化率断面异常，异常走向NE，倾向近直立，经钻孔验证，SIP极化率异常由矿（化）体引起。SIP的电阻率异常在矿（化）体上方显示有高阻异常，这可能是矿体赋存的裂隙空间对电流排斥的结果，所以矿体上表现的电阻率异常并不一定都是低阻。以物探在南戈滩矿区具有较好的找矿效果为基础，提出了在南戈滩矿区及其外围寻找以铁为主的多金属矿床模式：首先用磁法和激电中梯进行1∶1万扫面工作，圈定磁异常和激电异常，然后在同时存在磁异常和激电异常的地表进行SIP频谱激电测深剖面测量，剖面垂直地表磁异常和激电异常测量，圈定SIP断面极化率异常，对极化率异常进行工程揭示。
남과탄광구위우청해성도란현시체목분지동남부，시일개여섬장분암유관적석잡암형철다금속광상。이섬장분암암맥위중심，광상분위남북2개광대。광체부존재단렬식변대중，섬장분암맥、석잡암화대、광체화단렬산출일치。대광구불동적암（광）석진행료자성화전성삼수적측정화통계。통계결과표명：광체적자성강、겁화솔고、전조솔저；이위암적자성저、겁화솔저、전조솔고。광체화위암존재명현적물성차이，위재본구개전자법화전법공작제공료물성전제。통과재광구개전1∶1만자법화격전법소면공작，권정료3처자이상화1조격전이상대。재자、전이상중합적지단포설료3조SIP빈보격전측심부면，권정료3개SIP겁화솔단면이상，이상주향NE，경향근직립，경찬공험증，SIP겁화솔이상유광（화）체인기。SIP적전조솔이상재광（화）체상방현시유고조이상，저가능시광체부존적렬극공간대전류배척적결과，소이광체상표현적전조솔이상병불일정도시저조。이물탐재남과탄광구구유교호적조광효과위기출，제출료재남과탄광구급기외위심조이철위주적다금속광상모식：수선용자법화격전중제진행1∶1만소면공작，권정자이상화격전이상，연후재동시존재자이상화격전이상적지표진행SIP빈보격전측심부면측량，부면수직지표자이상화격전이상측량，권정SIP단면겁화솔이상，대겁화솔이상진행공정게시。
The Nangetan mine located in the southeast of Qaidam Basin in Dulan County,Qinghai Province,is a skarn type iron-based multi-metal deposits related to diorite porphyry.The mineral deposit can be divided into two ore belt areas,north area and south area,by diorite porphyrite dikes.Ore bodies occur in the fracture altered zone, and the outputs of diorite porphyrite veins,skarnization belt,orebody and fault are consistent.Through the measuring and the statistics of the magnetic and electrical parameters of the different rocks and ores,what was known is there is the strongest magnetic,highest polarization rate and the lowest resistivity for the ore bodies,while lower magnetic and polarization rate and higher resistivity for surrounding rock.The differences between the ore bodies and surrounding rock are obviously,and it is the physical foundation for the works of magnetic method and electrical method in this area.In recent years,the author carried out the works of 1∶10 000 magnetic method and IP method in mine sweeping surface,and delineated three magnetic anomaly areas and one IP anomaly area.By setting up three SIP spectral IP sounding profile in the areas where overlapped by the magnetic and the electric anomaly. Then,three SIP polarizability anomalies areas,with abnormal trend of northeast and the tendency of nearly erect, were delineated.The drilling results show that the anomaly of SIP polarization caused by the ore body (mineralization),and the anomaly of the ore’s (mineralized bodies) SIP resistivity showed different anomaly in resistance.High resistivity anomalies may be caused by the rejection of the current in the fractured ore,so the performance of resistivity anomaly is not necessarily low resistance.Based on the prospecting effect of geophysical prospecting in Nangetan mine, the model for searching the polymetallic deposit dominated by iron in Nangetan and the surrounding areas was proposed:using magnetic method and IP intermediate gradient for 1∶10 000 scanning to delineat the anomaly of the magnetic and the IP,then setting up SIP spectral IP sounding profile in the land surface areas where overlapped by the magnetic and the electric anomaly,measuring profile plumb with the magnetic anomaly and the IP anomaly areas.Finally,delineating polarization anomaly of the SIP section,and revealed the project.