本文選題：高寒凍土區(qū) + 地電提取��； 參考：《中國地質(zhì)大學(xué)(北京)》2016年博士論文

【摘要】：青藏高原是近年來地質(zhì)找礦突破的熱點(diǎn)之一,以高寒凍土區(qū)為主要景觀,但是特殊的景觀條件使得常規(guī)勘查方法遇到了巨大困難與挑戰(zhàn)。地電提取法作為勘查新方法之一,在多個景觀條件下都取得了良好效果,但高寒凍土區(qū)的適用性還有待研究。本文以青海祁連縣尕大阪銅多金屬礦區(qū)為例,開展了地電提取法的技術(shù)條件對比和可行性研究,討論高寒凍土區(qū)不同技術(shù)參數(shù)的合理性,并分析不同元素的異常特征,確定最佳技術(shù)參數(shù)。在此基礎(chǔ)上,在相同景觀條件下的其他兩個礦床(多才瑪、扎家同哪)也進(jìn)行了可行性驗(yàn)證和找礦預(yù)測。利用現(xiàn)代統(tǒng)計學(xué)方法對地電提取數(shù)據(jù)的統(tǒng)計分布特征進(jìn)行觀察,合理地圈定異常,科學(xué)地劃分異常類型。主要取得以下認(rèn)識:1、對供電電壓、提取液用量、提取液濃度、供電時間、提取電極間距等5種技術(shù)條件的不同參數(shù)進(jìn)行對比,發(fā)現(xiàn)在高寒凍土區(qū)地電提取法的最佳工作參數(shù)是9-12V電壓、1000mL且15%濃度的硝酸、24-48h時間、1m間距。2、在尕大阪礦區(qū)地電提取11種元素中,找礦效果最好的是Ti、Ni,其次為Cu、Zn、Bi,稍差的是Pb,其他元素基本無異常。3、在三個礦區(qū)的可行性試驗(yàn)中,均出現(xiàn)了包含主成礦元素在內(nèi)的多元素組合異常。尕大阪銅多金屬礦區(qū)以Ti、Ni、Cu、Zn、Bi等元素異常為主;多才瑪鉛鋅礦區(qū)以Cd、Pb、Zn、Au等元素異常為主,Cu、Ag次之;扎家同哪金礦區(qū)Au、Ag、As、Sb異常均較明顯。4、各預(yù)測區(qū)的元素組合特征與已知剖面大致相同,并且都出現(xiàn)了明顯的異常濃集中心和濃度分帶現(xiàn)象。尕大阪預(yù)測區(qū)出現(xiàn)了2個異常濃集中心,控礦斷裂F39從兩者附近通過。多才瑪預(yù)測區(qū)在中部出現(xiàn)了一個較大規(guī)模的異常濃集中心,其范圍包含了3條已知礦體所在位置以及其東延部位,有3條近EW向的控礦斷層通過。扎家同哪金礦預(yù)測區(qū)其他元素與Au的異常重合性不好,沒有明顯的濃集中心。5、在高寒凍土區(qū)的兩個多金屬硫化物礦床中,以主成礦元素的地電提取異常較為明顯。尕大阪銅多金屬礦中Cu、Zn的異常明顯,Pb不明顯。而在多才瑪鉛鋅礦中Pb、Zn異常明顯,Cu不明顯。Pb異常與土壤含量更密切。6、高寒凍土區(qū)金礦的地電提取異常以Au為主,其他元素與Au的重合性不好。7、提出因子分析與元素含量等值線相結(jié)合的方法,利用因子得分宏觀控制單元素異常的圈定和多元素異常的組合,取得了良好效果。一定程度上排除了無效(零散)異常。
[Abstract]:The Qinghai-Xizang Plateau is one of the hotspots of geological prospecting breakthrough in recent years, taking the alpine frozen soil region as the main landscape, but the special landscape conditions make the conventional exploration methods meet with great difficulties and challenges. As one of the new exploration methods, geoelectric extraction method has achieved good results in many landscape conditions, but the applicability of alpine permafrost region needs to be studied. Taking GaOsaka copper-polymetallic mining area in Qilian County, Qinghai Province as an example, the technical conditions and feasibility of geoelectric extraction method are compared and studied. The rationality of different technical parameters and the anomalous characteristics of different elements are discussed. Determine the best technical parameters. On this basis, the feasibility verification and prospecting prediction of the other two deposits under the same landscape conditions are also carried out. By using modern statistical method, the statistical distribution characteristics of geoelectric data are observed, the anomalies are reasonably delineated, and the abnormal types are scientifically classified. The main conclusions are as follows: 1. The different parameters of five technical conditions, such as the power supply voltage, the amount of the extract solution, the concentration of the extract solution, the power supply time, the distance between the extracted electrodes, etc., are compared. It is found that the optimum working parameters of the method for geoelectric extraction in the frozen and alpine regions are as follows: (1) the distance of 1m m ~ (-1) m ~ (-1) 路2 ~ (2) in a range of 10 ~ 12 V voltage of 1000ml and 15% concentration of nitric acid in 24-48 h, and 11 elements are extracted from the geoelectric extraction in GaOsaka mining area. The best prospecting effect is Tiji-Ni, the next is Cuznzn Bi. the other elements have no anomaly. 3. In the feasibility tests of the three mining areas, there are multi-element assemblage anomalies including the main ore-forming elements. In the GaOsaka copper polymetallic ore area, the elements such as Tigniao, Cu, Zn, O, Bi and so on are mainly anomalous; in the Docima lead and zinc mine, the major anomalies of the elements, such as CD Pb, Zn, O, au, au, Ag, and so on, and the au Ag Ag are obvious in the Zhajiatong gold ore area, and the element assemblage characteristics of each predicted area are approximately the same as those of the known profiles, and the results show that the elements in the predicted area are similar to those in the known sections. And there are obvious abnormal concentration centers and concentration zonation phenomenon. There are two abnormal concentration centers in GaOsaka prediction area, and the ore-controlling fault F39 passes from them. There is a large concentration center in the middle of Docima prediction area, which includes three known orebodies and their eastward extension, and three ore-controlling faults in EW direction. The anomalous coincidence of other elements with au in Zhajiatongna gold ore prediction area is not good, and there is no obvious concentration center. In the two polymetallic sulphide deposits in the alpine permafrost region, the geo-electric extraction of the main ore-forming elements is obvious. The anomaly of Cu Zn in GaOsaka copper polymetallic deposit is not obvious. In Docima lead-zinc ore, the Pb anomaly is not obvious. The Pb anomaly is more closely related to the soil content, and au is the main anomaly in the geoelectric extraction of gold deposits in the high frozen soil area. The coincidence of other elements with au is not good. 7. The method of combining factor analysis with element content isoline is put forward. Good results are obtained by using factor score macroscopically controlling the delineation of element anomaly and the combination of multi-element anomaly. Invalid (piecemeal) anomalies are ruled out to some extent.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2016
【分類號】：P631.3

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