【摘要】：中國既是對銅礦有大需求的國家也是銅礦資源短缺的國家。易門銅礦帶是滇中地區(qū)重要的銅資源產(chǎn)區(qū),該處發(fā)育大量銅礦床(點)。目前,易門銅礦帶的獅鳳山銅礦瀕臨閉坑,而銅廠礦區(qū)具備接替礦山的基本條件。受玉溪礦業(yè)有限公司的委托,昆明理工大學(xué)對易門銅廠及外圍銅礦成礦規(guī)律與找礦預(yù)測進行研究,為選定接替礦山提供科學(xué)依據(jù)。2010年,云南省有色地質(zhì)局地質(zhì)地球物理化學(xué)勘查院在銅廠礦區(qū)南部開展了物探工作,取得了一定的成果,但在北部,相應(yīng)的物探工作還未開展。激發(fā)極化法(IP)在尋找銅礦中是一種快速、高效和經(jīng)濟的方法,IP可以發(fā)現(xiàn)和研究浸染型礦體,也可以發(fā)現(xiàn)規(guī)模較小,埋深較大的礦體；高頻大地電磁法(EH4)具有高精度、高分辨率,設(shè)備輕、速度快、探測深度大(可達1000m)、對低阻異常反應(yīng)明顯等特點。在銅廠礦區(qū)北部的新莊礦段開展IP掃面工作,結(jié)合IP異常分布、特征及勘查區(qū)地質(zhì)條件等情況,在重點剖面處布置EH4工作,目的主要是為了尋找熱液脈型礦體,兼顧尋找銅廠式礦體。新莊礦段IP工作網(wǎng)度為50×20m,共完成0.35km2掃面工作, EH4點距為20m,共完成1.8km剖面工作,采集巖(礦)石標本211件。對巖(礦)石物性特征進行統(tǒng)計分析,歸納總結(jié)了巖(礦)石磁性參數(shù)、電性參數(shù)、放射性參數(shù)和密度參數(shù)特征。由于勘查區(qū)存在炭質(zhì)層干擾,為了突出礦體異常,較好的分離區(qū)域場和異常場,對采集的IP數(shù)據(jù)進行最小二乘法趨勢分析處理,共獲得9個IP異常；對采集的EH4數(shù)據(jù)進行IMAGEM反演,反演結(jié)果顯示視電阻率數(shù)據(jù)可能受到靜態(tài)效應(yīng)的影響,使用電磁陣列剖面法及小波變換方法進行靜態(tài)效應(yīng)壓制處理,后選擇相應(yīng)的處理數(shù)據(jù)繪制深度-視電阻率斷面圖,共獲得28個EH4異常。本文在收集勘查區(qū)地質(zhì)、地球物理和地球化學(xué)的基礎(chǔ)上,建立了地球物理、地球化學(xué)的異常模型。后通過對IP異常和EH4異常的推斷解釋分析,并結(jié)合勘查區(qū)地質(zhì)特征、控礦構(gòu)造特征及已建立的異常模型等,圈定了3個找礦靶區(qū),推測估算勘查區(qū)遠景資源量約為3萬噸。對靶區(qū)I-3進行工程驗證,見到熱液脈型銅礦,證明了物探投入方法的有效性,同時也為銅廠礦區(qū)下一步找礦工作指明了方向。
[Abstract]:China is both a country with a large demand for copper and a shortage of copper resources. The Yimen copper belt is an important copper resource producing area in central Yunnan, where a large number of copper deposits are developed. At present, Shifengshan copper deposit in Yimen copper belt is close to the pit, and Tongchang mine has the basic conditions to replace the mine. Entrusted by Yuxi Mining Co., Ltd, Kunming University of Science and Technology studied the metallogenic regularity and prospecting prediction of Yimen Copper Factory and its peripheral copper deposits, which provided a scientific basis for the selection of replacement mines. In 2010, The Geophysical Geophysical and Chemical Exploration Institute of Yunnan Nonferrous Geology Bureau has carried out geophysical prospecting work in the southern part of Tongchang Mining area and has achieved certain results, but the corresponding geophysical prospecting work has not been carried out in the north. The induced polarization method (IP) is a fast, efficient and economical method for finding copper deposits. IP can also find ore bodies with small scale and large buried depth. High frequency magnetotelluric method (EH4) has high precision and high resolution. The equipment is light, the speed is fast, the detection depth is large (up to 1000m), and the reaction to the low resistivity anomaly is obvious. IP sweep work is carried out in Xinzhuang section in the northern part of Tongchang mining area. Combined with the abnormal distribution of IP, characteristics and geological conditions of the exploration area, EH4 work is arranged at key sections, the main purpose of which is to find hydrothermal vein orebodies. Look for copper-type orebodies as well. The IP work network of Xinzhuang mine section is 50 脳 20m, the 0.35km2 scanning surface work is completed, the EH4 point distance is 20m, the 1.8km section work is completed, and the samples of rock (ore) are collected. The characteristics of magnetic parameters, electrical parameters, radioactivity parameters and density parameters of rock (ore) rocks are summarized by statistical analysis. In order to outshine ore body anomaly and separate area field and anomaly field, the collected IP data were analyzed and processed by least square method. Nine IP anomalies were obtained. The IMAGEM inversion of the collected EH4 data shows that the apparent resistivity data may be affected by static effects. The electromagnetic array profile method and wavelet transform method are used to suppress the static effects. Then, 28 EH4 anomalies were obtained by selecting the corresponding processing data to draw the depth-apparent resistivity profile. On the basis of collecting geology, geophysics and geochemistry in the exploration area, the anomaly model of geophysics and geochemistry is established in this paper. Based on the analysis of IP anomaly and EH4 anomaly, combined with geological characteristics of exploration area, ore-controlling structure characteristics and established abnormal model, three prospecting target areas are delineated, and the prospective resource quantity of exploration area is estimated to be about 30 thousand tons. The engineering verification of I-3 in target area shows that the hydrothermal vein type copper deposit is effective, which proves the validity of the geophysical exploration method and points out the direction of the next prospecting work in Tongchang mining area.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.41;P631

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