本文選題：黃鐵礦 + 成因礦物學(xué)��； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：遼寧五龍金礦位于華北地臺(tái)東緣,營(yíng)口—寬甸古隆起的南部,鴨綠江成礦帶西北側(cè)。本文在前人研究的基礎(chǔ)上,采用成因礦物學(xué)與找礦礦物學(xué)為理論指導(dǎo)對(duì)五龍金礦2號(hào)井控制的幾條金礦脈之主成礦階段黃鐵礦進(jìn)行了標(biāo)型特征研究,并探討了礦床成因及成礦熱液來源,為深部成礦預(yù)測(cè)提供了科學(xué)依據(jù)。五龍金礦2號(hào)井黃鐵礦的S/Fe為1.90~1.98,屬于虧硫型;其ω(Fe)/ω(S+As)在0.888~0.908范圍,因此認(rèn)為五龍金礦區(qū)黃鐵礦形成于中偏淺成礦深度。黃鐵礦輕稀土微富集、重稀土顯虧損,Ce具有不同程度的負(fù)異常,Eu則表現(xiàn)出較為顯著的正或負(fù)異常;Co/Ni比值變化范圍介于0.21~4.20之間,且隨著深度的增加該比值有增大的趨勢(shì);其中前緣暈元素砷,近礦暈元素鉛、銀、鋅,和尾暈元素鈷、鎳,具有相互疊加特征,表明該礦床的形成是多期次、多階段相互作用成礦。不同標(biāo)高礦體黃鐵礦中微量元素組合(砷+銻+硒+銻)、(鋅+銅+鉛+銀)、(鈷+鎳+鈦+鉻)垂向上總體顯示旋回式震蕩變化特點(diǎn),同樣佐證該成金沉淀為含礦熱液多期次疊加所致。主成礦階段黃鐵礦熱電性測(cè)試結(jié)果表明,以P導(dǎo)型為主,熱電系數(shù)變化范圍為㧟319.5~㧏333.9μV/℃,其直方分布圖表現(xiàn)為雙峰類型�？臻g上,P導(dǎo)型出現(xiàn)率在-454m—-609m標(biāo)高范圍內(nèi)呈“S”型波動(dòng),在-609m標(biāo)高以下P導(dǎo)型出現(xiàn)率在80%以上,并顯示出很強(qiáng)的下延增大趨勢(shì),說明-454m—-609m標(biāo)高范圍的礦體仍然屬于礦床的中上部。根據(jù)黃鐵礦熱電性參數(shù)計(jì)算,2號(hào)井礦脈在-454m—-609m標(biāo)高范圍的剝蝕率(γ)變化范圍為29.5~64.5%,且呈現(xiàn)波動(dòng)式變化,且在-609m標(biāo)高以下有明顯減小的趨勢(shì),同樣暗示目前采礦空間內(nèi)礦體屬于礦床的中上部位,深部仍有找礦前景。依據(jù)熱電性參數(shù)計(jì)算結(jié)果,2號(hào)井2-3號(hào)礦脈主成礦階段黃鐵礦形成溫度為75.4—384.8℃,可以進(jìn)一步分為兩個(gè)溫度區(qū)間,即高溫區(qū)間300~360℃,峰值為330℃;中低溫區(qū)間100~280℃,峰值為200℃。暗示經(jīng)歷兩期成礦。礦石中微量元素銀、銅、砷、鉛、鉍、鉬異常顯示具有一定的規(guī)律性和差異性,而且這些元素縱投影等值線趨勢(shì)圖顯示高值區(qū)呈串珠狀向南側(cè)伏,可推測(cè)成礦流體通道向南傾伏。其中,銀、銅、砷、鉛、鉍等值線異常區(qū)疊加,在南部-609m標(biāo)高處見有兩處高值區(qū)向下未閉合,暗示有向下延伸的趨勢(shì)。鑒此推斷南段礦體下部仍有找礦前景。
[Abstract]:The Wulong gold deposit is located in the south of Yingkou-Kuandian paleouplift in the eastern margin of the North China platform and in the northwest of the Yalu River metallogenic belt. Based on the previous studies, the typomorphic characteristics of pyrite in the main ore-forming stage of several gold veins controlled by well No. 2 in Wulong Gold Mine are studied by using genetic mineralogy and prospecting mineralogy as the theoretical guidance. The origin of ore deposit and the source of ore-forming hydrothermal solution are discussed, which provides scientific basis for deep metallogenic prediction. The S/Fe of pyrite in well No. 2 of Wulong Gold Mine is 1.90 ~ 1.98, which belongs to the type of sulfur deficiency, and its 蠅 _ (Fe _ () / 蠅 ~ (S) _ (S) is in the range of 0.8880.908, so it is considered that the pyrite in Wulong gold ore area was formed in the mid-shallow ore-forming depth. The light rare earth elements of pyrite are microenriched, and the negative anomalous EU shows significant positive or negative anomalies in different degrees, and the range of the ratio of Co / Ni is between 0.21 and 4.20, and the ratio increases with the increase of depth. Among them, lead halo element arsenic, near ore halo element lead, silver, zinc, and tail halo element cobalt and nickel have superimposed characteristics, which indicates that the ore deposit was formed by multi-stage and multi-stage interaction. The combination of trace elements (arsenic, antimony, selenium and antimony) (zinc, copper, lead, silver, cobalt, nickel, titanium and chromium) in pyrite of different elevation bodies shows the characteristics of cyclic oscillations. It is also proved that the gold deposit is caused by the multistage superposition of ore-bearing hydrothermal solution. The thermoelectric properties of pyrite in the main metallogenic stage showed that the main type of pyrite was P conductance, and the variation range of thermoelectric coefficient was 333.9 渭 V / 鈩，

本文編號(hào)：1885586