本文選題：康山金礦　切入點(diǎn)：地球化學(xué)特征　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：康山金礦位于華北地臺(tái)南部熊耳山西緣,區(qū)內(nèi)地層簡(jiǎn)單,太華群作為基底,熊耳群作為蓋層,本文關(guān)鍵對(duì)康山金礦床變質(zhì)巖、火山巖、蝕變巖和金礦石的主微量稀土特征進(jìn)行系統(tǒng)研究分析,對(duì)控礦構(gòu)造特征進(jìn)行實(shí)地野外考察和構(gòu)型解剖,對(duì)區(qū)域地質(zhì)背景和礦區(qū)地質(zhì)情況總結(jié)歸納,由點(diǎn)及面對(duì)熊耳山地區(qū)金礦成因進(jìn)行了解和詮釋。康山金礦區(qū)片麻巖具有富堿、富鋁特點(diǎn),原巖具有多源性,受到后期沉積作用和多期變質(zhì)作用,主要原巖為火成巖和厚層泥巖。礦區(qū)火山巖主要為亞堿性,屬于鉀玄巖和高鉀鈣堿性系列的玄武安山巖,具有富鐵、富鎂、富堿和少鋁的特征。從片麻巖-安山巖-蝕變巖-金礦石,SiO2質(zhì)量分?jǐn)?shù)逐漸升高,金的含量也隨之增大。金礦石微量元素中,Rb、Ba、K富集、La、Ce、Nd、P、Zr、Hf、Y相對(duì)富集,虧損親石元素Th、U和Ta、Nb、Sm、Ti、Lu,Sr、Nb和Ti強(qiáng)烈虧損。金礦石樣品與蝕變巖以及賦礦地層安山巖的標(biāo)準(zhǔn)化分布曲線比較接近,礦石中V/Cr與Sr/Ba呈微弱正相關(guān)。太華群金的平均豐度為1.14×10-9,熊耳群平均值為0.64×10-9,從含金性來(lái)看,太華群提供成礦物質(zhì)金的可能性稍大�？瞪綐悠废⊥燎�都呈右傾型分布,均具有輕稀土微弱富集,重稀土微弱虧損的特點(diǎn),蝕變巖分布曲線位于金礦石和圍巖的過(guò)渡區(qū)間。金礦石輕重稀土大部分分異不太明顯,其含量明顯低于賦礦地層,傾斜角度與區(qū)內(nèi)片麻巖和安山巖具有一致性,說(shuō)明太華群和熊耳群都提供了一定的成礦物質(zhì),整體上,金礦石稀土特征值∑REE與LREE/HREE呈微弱正相關(guān),LREE/HREE與δEu呈直線負(fù)相關(guān)關(guān)系,這與海相原巖沉積特征相符合。區(qū)內(nèi)其構(gòu)造控礦模式具有“一街五巷三層樓”特點(diǎn),一街指北東向的康山-七里坪斷裂為主控礦斷裂,五巷指與主控礦斷裂平行的同次級(jí)斷裂,三層樓指蝕變及其分帶。礦脈的分布具有等間距性疊加分布的特征,其不同位置的礦脈的品位和厚度也分布極不均勻,礦化作用從北部-東部-西部-南部礦化程度依次增強(qiáng),厚度和品位具有正相關(guān)關(guān)系,含礦熱液成礦的規(guī)律,具有脈動(dòng)特征。區(qū)內(nèi)幔源太華群和熊耳群以及殼源巖漿提供Au、S、Pb等微量元素,沿著導(dǎo)礦通道運(yùn)移上行,期間先后受巖漿水、大氣降水的混合作用,直至斷裂交匯部位富集下來(lái),在成因上屬于中(低溫)巖漿期后熱液金礦床。
[Abstract]:The Kangshan gold deposit is located in the west margin of Xiong er Mountain in the south of North China platform. The strata in the area are simple, Taihua Group is the basement and Xiong er Group is the caprock. In this paper, the metamorphic rocks and volcanic rocks of the Kangshan gold deposit are discussed. The main trace rare earth features of altered rocks and gold ores are systematically studied and analyzed. Field field investigation and structural anatomy of ore-controlling structural characteristics are carried out, and regional geological background and geological conditions in mining areas are summarized and summarized. The origin of gold deposits in Xiongershan area is understood and interpreted. The gneiss in Kangshan gold deposit area is characterized by alkali-rich, aluminum-rich, multisource, late sedimentation and multi-stage metamorphism. The main primary rocks are igneous rocks and thick mudstone. The volcanic rocks in the mine are mainly subalkaline and belong to kalmonite and high potassium calc-alkaline series Black Tortoise andesite, which are rich in iron and magnesium. From the mass fraction of gneiss, andesite, altered rock and gold ore, the content of gold increases with the increase of mass fraction of SiO2. The depletion of the lithophile elements Thu U and Tahln NbSm Sm Sm Ti Li Lun SrNb and Ti are strongly depleted. The distribution curves of the gold ore samples are close to those of altered rocks and ore-bearing strata andesite, the distribution curves of which are similar to those of the ore-bearing strata andesite. The average abundance of Taihua gold is 1.14 脳 10 ~ (-9) and the average value of Xiong ear group is 0.64 脳 10 ~ (-9). The distribution curve of altered rock is located in the transition zone between gold ore and surrounding rock. Most of the differentiation of rare earth elements in gold ore is not obvious, and its content is obviously lower than that of ore-bearing strata. The inclination angle is consistent with gneiss and andesite in the area, indicating that both Taihua Group and Xiong'er Group provide certain ore-forming materials. On the whole, the rare earth characteristic value 鈭，

本文編號(hào)：1619352