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  本文選題：安慶銅礦 + 烏珠尖探區(qū)�。� 參考：《南京大學(xué)》2015年碩士論文

【摘要】：安慶銅礦位于安徽省安慶市懷寧縣月山鎮(zhèn),是長江中下游鐵銅成礦帶重要銅礦床之一。經(jīng)過多年的開采,淺部資源儲量不斷減少,深部找礦成為地質(zhì)工作的主要任務(wù)。前人研究表明:月山地區(qū)礦體一般賦存于褶皺傾伏端及兩翼部位,月山閃長巖體與月山組大理巖的接觸帶是成礦的必要條件。斷裂構(gòu)造控制礦床的空間分布和保存條件,NE和近EW向的兩組基底斷裂是良好的巖漿通道,NW和近SN向的兩組斷裂對礦體有破壞作用。因此,研究區(qū)構(gòu)造精細分析對尋找深部礦體至關(guān)重要。本文通過對研究區(qū)褶皺構(gòu)造的研究,認為百子山背斜軸向為NNE,該背斜的傾伏端——月山-黃土山背斜是有利的成礦部位。F1斷層為成礦后斷裂構(gòu)造,對礦體起破壞作用,F1斷層具有多期活動特征,以左行平移為主,其水平位移量為200～400m,推測烏珠尖勘探區(qū)的有利靶區(qū)可能向北平移�？煽卦匆纛l大地電磁法(簡稱CSAMT)是依據(jù)礦石與圍巖在電性上存在明顯的差異性,在CSAMT反演剖面上尋找礦體引起的低阻異常帶。但是,低阻異常本身具有多解性,如斷層帶和含水層等也可以引起低阻異常,僅僅利用CSAMT法指導(dǎo)找礦存在不確定性。本文通過對鄰區(qū)已找到礦體對應(yīng)CSAMT剖面曲線特征的研究,認為CSAMT曲線形態(tài)為"V"形低阻帶和陡降低阻帶可能成為有利的勘探部位;搜集烏珠尖勘探區(qū)及鄰區(qū)19個鉆孔資料和地表實測數(shù)據(jù),制作了烏珠尖勘探區(qū)月山巖體頂面等深線圖和月山組頂面等深線圖,并將其投影至CSAMT曲線剖面上,得出CSAMT圖地質(zhì)剖面解釋;在閃長巖與月山組碳酸鹽巖接觸帶上尋找與鄰區(qū)相似的含礦CSAMT曲線形態(tài)特征,提出有利的勘探孔位。野外地質(zhì)調(diào)查研究確定了月山-黃土山背斜褶皺形態(tài),朱沖礦區(qū)位于其北西翼,烏珠尖探區(qū)位于其南東翼,通過構(gòu)造解析和含礦構(gòu)造有利部位分析得知,在烏珠尖探區(qū)可能存在與朱沖礦體構(gòu)造部位具有對稱性的礦體。同時,根據(jù)CSAMT剖面設(shè)計的鉆孔正好落在該背斜核部和南東翼有利成礦部位。本文利用物探資料與構(gòu)造地質(zhì)解析有效結(jié)合起來,兩者相互補充,提高了尋找成礦靶區(qū)的可靠性。
[Abstract]:Anqing Copper Mine, located in Yueshan Town, Huining County, Anqing City, Anhui Province, is one of the important copper deposits in the iron-copper metallogenic belt in the middle and lower reaches of the Yangtze River. After many years of mining, shallow resources reserves are decreasing, and deep prospecting has become the main task of geological work. Previous studies have shown that the orebodies in Yueshan area are generally located at the fold tip and the two flanks, and the contact zone between the Yueshan diorite and the Yueshan formation marble is a necessary condition for mineralization. Two sets of basement faults in NE and near EW direction are two groups of faults in good magmatic channel, NW and near SN, which have a destructive effect on the orebody, the spatial distribution and preservation conditions of the deposit are controlled by fault tectonics. Therefore, the detailed structural analysis of the study area is very important for the exploration of deep orebodies. Based on the study of fold structures in the study area, it is considered that the back slope of Baizishan is NNE.The dip end of the anticline, Yueshan-Loess Mountain anticline, is a favorable metallogenic position. F1 fault is a post-metallogenic fault structure. The fault of F _ 1, which is destructive to ore body, has the characteristics of multi-stage activity, with the horizontal displacement of 200 ~ 400m, which is mainly left line translation. It is inferred that the favorable target area in Wuzhu tip exploration area may be shifted northward. The controllable source audio frequency magnetotelluric method (CSAMTM for short) is based on the obvious difference in electrical properties between ore and surrounding rock. The low resistivity anomaly zone caused by ore body is searched on the CSAMT inversion profile. However, the low resistivity anomaly itself has multiple solutions, such as fault zone and aquifer can also cause low resistivity anomaly, only using the CSAMT method to guide the prospecting is uncertain. Based on the study of the characteristics of the corresponding CSAMT profile curves of the ore bodies found in the adjacent area, it is considered that the CSAMT curve shape is "V" shape low resistivity zone and steeply reduced resistance zone, which may become a favorable exploration site. Collecting 19 borehole data and surface measured data of Wuzhoujian exploration area and adjacent area, the isobath map of the top surface of Yueshan rock body and the isobath map of the top surface of Yueshan formation in Wuzhu tip exploration area were made and projected onto the CSAMT curve section. The geological profile of the CSAMT map is obtained and the ore-bearing CSAMT curves similar to those in the adjacent area are found in the contact zone between diorite and Yueshan formation carbonate rocks. The favorable exploration hole position is proposed. Field geological investigation has determined the fold form of Yueshan-Loess Mountain anticline. The Zhuchong mining area is located on its north west wing, and the Wuzhu tip exploration area is located on its south and east flank. It is known by structural analysis and analysis of favorable parts of ore-bearing structure. In Wuzhu Tien exploration area, there may be a ore body with symmetry with Zhuchong orebody. At the same time, the boreholes designed according to the CSAMT profile are located in the anticline core and the favorable metallogenic position in the east and south wing of the anticline. In this paper, geophysical data and structural geological analysis are effectively combined, which complement each other and improve the reliability of searching for ore-forming targets.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.41

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