本文選題：峪耳崖金礦 + 礦床地質(zhì)��； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：峪耳崖金礦位于冀東地區(qū),大地構(gòu)造上屬于華北克拉通北緣中段,燕山褶皺帶東部與山海關(guān)隆起相交的位置,馬蘭峪復(fù)式背斜的北側(cè)區(qū)域。礦區(qū)內(nèi)的地層大致可以分為兩個部分,下部為太古宇變質(zhì)巖系,上部以中元古界碳酸鹽巖為主的沉積地層;構(gòu)造發(fā)育,控礦斷裂主要呈北東、北北東向;巖漿巖主要以燕山期峪耳崖花崗巖為主,并構(gòu)成其主要賦礦巖石。礦石以石英-多金屬硫化物脈型、石英細脈浸染型為主。礦石礦物主要包括黃鐵礦、黃銅礦、閃鋅礦、方鉛礦、鎳黃鐵礦等,脈石礦物主要有石英、長石、絹云母、綠泥石、方解石等。金主要以裂隙金、包裹金的狀態(tài)賦存于硫化物(主要為黃鐵礦)中,少量分布于石英的裂隙中。近礦蝕變主要為硅化、黃鐵礦化、綠泥石化、絹云母化。成礦階段從早到晚依次劃分為乳白色石英-黃鐵礦階段、煙灰色石英-多金屬硫化物階段、細粒石英-黃鐵礦階段、脈狀方解石階段;其中第二、三為主要的金成礦階段。主成礦期礦脈包裹體水δD值范圍為-66‰~-112‰,計算的包裹體水δ18O值范圍為5.4‰~7.2‰,花崗巖包裹體水δD值范圍為-63‰~-104‰,計算的包裹體水δ18O值范圍為3.3‰~5.8‰;主成礦期方解石δ13CPDB值介于-3.7‰~-6.8‰,δ18OSMOW值介于9.6‰~18.8‰;礦石黃鐵礦δ34S的值在2.5‰~4.5‰之間。以上同位素特征指示成礦流體、物質(zhì)均來自巖漿體系。Pb同位素特征指示成礦物質(zhì)主要來自下地殼。礦石稀土元素特征顯示成礦與花崗巖密切相關(guān)。峪耳崖花崗巖的SiO2含量的變化范圍為74.34%~75.78%,平均含量75.17%。Al2O3含量為13.22%~14.68%,平均為13.60%;A/CNK值位于0.98~1.06之間,平均1.02;表現(xiàn)出過鋁質(zhì)的特征。w(TFe2O3)/w(MgO)值位于3.26~7.36之間,平均5.66,值較低;P2O5含量很低;總堿(Na2O+K2O)含量較高,平均8.70%。富集Rb、Th、U、K、La、Ce等元素,虧損P、Ti等元素;δEu值在0.42~0.63之間,平均為0.51;巖體稀土球粒隕石配分圖呈現(xiàn)出輕、重稀土分餾明顯,右傾的特征。綜合這些特征判斷,峪耳崖花崗巖可能主要來自于下地殼的重熔。金礦形成于下地殼的重熔作用產(chǎn)生的酸性巖漿的演化晚期。礦床為典型的巖漿熱液型金礦床。
[Abstract]:The Yuerya gold deposit is located in the eastern part of Hebei Province, and belongs to the middle segment of the northern margin of North China Craton, the position of intersection between the eastern Yanshan fold belt and Shanhaiguan uplift, and the northern side of the Malanyu complex anticline. The strata in the mining area can be roughly divided into two parts, the lower part is the Archean metamorphic series, the upper part is the sedimentary stratum of the middle Proterozoic carbonate rock, the structure is developed, the ore-controlling fault is mainly NNE, NNE; The magmatic rocks are mainly Yanshanian Yuerya granite and the main ore-hosting rocks. The ore is quartz-polymetallic sulphide vein type, quartz vein disseminated type. Ore minerals mainly include pyrite chalcopyrite sphalerite galena nickel pyrite etc. Gangue minerals mainly include quartz feldspar sericite chlorite calcite and so on. Gold is mainly fissured gold, the state of wrapped gold occurs in sulfides (mainly pyrite), and a small amount of gold is distributed in the fissures of quartz. Near-ore alteration is mainly silicification, pyrite, green mud petrifaction, sericite. The metallogenic stage is divided into the milky quartz-pyrite stage, the smoke gray quartz-polymetallic sulfide stage, the fine grain quartz-pyrite stage and the vein calcite stage from early to late, the second and third of which are the main gold metallogenic stage. The range of 未 D value of ore-vein inclusions is -66 鈥，

本文編號：1998143