本文選題：土壤地球化學(xué)　切入點(diǎn)：異常下限　出處：《成都理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：山西省夏縣洞溝金礦研究區(qū)大地構(gòu)造位于華北大陸亞板塊南部鄂爾多斯地塊與河淮地塊接觸帶南部,太行山地區(qū)中條山隆起中段。地層出露較全,構(gòu)造發(fā)育,巖漿活動(dòng)強(qiáng)烈,成礦地質(zhì)條件優(yōu)越。本次1:1萬土壤地球化學(xué)測量,擬結(jié)合前人的地質(zhì)研究及其地質(zhì)特征圈出并確定最有利的勘查地段,找出最有力的成礦遠(yuǎn)景區(qū),并總結(jié)其地球化學(xué)特征。為下一步的勘查工作提供最有力的證據(jù)及找礦方向。本文首先總結(jié)了本區(qū)的地質(zhì)背景并對土壤元素的濃度克拉克值、元素變異系數(shù)、偏度等地球化學(xué)特征進(jìn)行了統(tǒng)計(jì)和分析。通過對土壤化探數(shù)據(jù)統(tǒng)計(jì)分析得出土濃集克拉克值大于1的元素依次是Zn、Au、W、Ba、Bi、Pb、As、Sb、Hg,說明該類元素具有一定次生富集傾向,其中Hg、Sb、As、Pb等富集程度較高;元素變異系數(shù)大于1的元素有Au、Ag、Pb、Sb,表明研究區(qū)土壤中這些元素分布不均勻,離散程度大,分異性強(qiáng),有富集的趨勢,是成礦較有利的地球化學(xué)條件;Ag、Cu、Pb、Au、Mn、Sn等六個(gè)元素其偏度值較大,說明它們可能受到后期的地球化學(xué)作用的影響,使其在地質(zhì)體中的含量不服從正態(tài)分布。并且通過對研究區(qū)各個(gè)地質(zhì)單元分別統(tǒng)計(jì),可以得出構(gòu)造破碎帶成礦元素含量明顯高于其它地質(zhì)單元。通過對比分析迭代法、累積頻率法、盒須圖法進(jìn)行化探數(shù)據(jù)處理,并得出異常下限。從中選取最切合實(shí)際的異常下限值。利用地質(zhì)軟件完成16幅地球化學(xué)圖及16幅地球化學(xué)異常圖。其中:異常點(diǎn)個(gè)數(shù)較多的元素為Zn、Hg、Cu、Mo、Ag、As、Pb、Au、Sn等,大部分元素達(dá)到3級(jí)濃度帶,其中強(qiáng)度較高的元素有Cu、Au、Pb等元素;大多數(shù)元素的異常較分散,異常規(guī)模差異較大,異常濃集中心較為明顯;各元素異常分布具有一定的規(guī)律性。對測區(qū)土壤地球化學(xué)數(shù)據(jù)進(jìn)行多元統(tǒng)計(jì)分析,從元素相關(guān)性分析可以得出Au與As、Bi、Hg、Ba、Cu、W相關(guān)性較強(qiáng),因此這些元素可作為直接找礦的指示元素;從聚類分析可以劃分出①Ag、Pb、Zn、Mo;②Co、Ni、Cu、As、Sb、Bi;③Mn;④Ba、W、Hg、Au;⑤Sn等5種元素組合;通過因子分析從研究金的角度出發(fā)可以看出Au與F3、F4因子成正相關(guān),因此Au與Hg、Ba、W、As、Sb、Bi關(guān)系密切。與F1、F2、F5成負(fù)相關(guān),因此Au與Co、Cu、Mn、Ni、Ag、Pb、Zn、Mo、Mn、Sn關(guān)系不甚密切�？傊髟亟M合及其相關(guān)程度,可以反映主要成礦元素的次生富集特征。根據(jù)對土壤地球化學(xué)元素的綜合異常特征分析,綜合異常AP7元素組合Ag、Pb、Au、Hg、Zn、Mo、Cu、Sb、As、W、Sn、Bi,∑NAP值16.74,排序1。異常位于測區(qū)東部洞溝一帶,對應(yīng)大理巖地層,異常元素組合復(fù)雜,表現(xiàn)中高溫和中低溫元素組合特征,以中低溫元素為特征,也可以認(rèn)為礦床剝蝕淺,由46個(gè)單元素異常組成,異常處于構(gòu)造轉(zhuǎn)折部位內(nèi)側(cè),成礦條件有利,潛力大。在綜合異常的基礎(chǔ)上結(jié)合相關(guān)地質(zhì)背景圈出的成礦遠(yuǎn)景區(qū),位于礦區(qū)中部,面積約8.9km2。預(yù)測靶區(qū)巖性主要為絹片巖、白云石大理巖、石英巖;靶區(qū)中間發(fā)育有兩處構(gòu)造破碎帶,根據(jù)對其地球化學(xué)特征統(tǒng)計(jì),發(fā)現(xiàn)金礦化主要是發(fā)生在此區(qū)域,因此金礦化與此破碎帶有著密切的關(guān)系。
[Abstract]:Shanxi Xiaxian Donggou study area tectonic gold deposit is located in the North China sub plate, South Block and Ordos Hehuai block contact zone of southern Taihang Mountain area. The middle strata in uplift over the whole tectonic development, strong magmatic activity, metallogenic geological condition is superior. The 1:1 000 soil geochemical survey, to determine the most favorable the exploration area combined with the geological and geological characteristics of the previous research circle and find out the most powerful prospecs, and summarizes its geochemical characteristics. To provide the most powerful evidence for the exploration work in the next step and prospecting direction. This paper summarizes the geological background of the region and the soil elements concentration Clark value. The element variation coefficient, skewness and other geochemical characteristics are collected and analyzed. Based on the soil geochemical data statistical analysis was unearthed from the concentration Clark values greater than 1 elements are Zn, Au W, Ba, Bi, Pb, As, Sb, Hg, indicating that this kind of element has a secondary enrichment tendency, including Hg, Sb, As, Pb and other high concentration elements; variation coefficient is greater than 1 of the elements are Au, Ag, Pb, Sb, indicating that the uneven distribution of these elements in soil discrete degree, big difference, there is a trend of enrichment, is a favorable metallogenic geochemical conditions; Ag, Cu, Pb, Au, Mn, Sn and other six elements of the skewness value is large, indicating that they may be affected by the geochemistry of late, the content in the geological body obey the normal distribution. And through the statistics of various geological units in the study area, can draw the structural fracture zone of ore-forming elements was significantly higher than that of other geological units. Through the comparative analysis of the iterative method, cumulative frequency method, box chart method for geochemical data processing, and the anomaly threshold. Select the most practical the use of value. 鍦拌川杞歡瀹屾垚16騫呭湴鐞冨寲瀛﹀浘鍙，

本文編號(hào)：1645543