本文選題：礦床成因　切入點(diǎn)：礦床地質(zhì)特征　出處：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：膠東半島為我國最大的金礦成礦省。雖占全國國土面積的0.3%但卻占有中國黃金全部儲(chǔ)量的25%。地區(qū)內(nèi)90%以上的金礦床均產(chǎn)于三(山島)-倉(上)、招(遠(yuǎn))-平(度)、焦家-新城等三條斷裂帶上。前人較為關(guān)注對(duì)焦家斷裂等大斷裂的研究,但對(duì)域內(nèi)大型斷裂的分支-次一級(jí)斷裂(如侯家斷裂、望兒山斷裂等)的研究相對(duì)較少,而望兒山斷裂為研究區(qū)內(nèi)主要的控礦和容礦斷裂。本文在總結(jié)前人在本地區(qū)的研究基礎(chǔ)上,以望兒山斷裂中段上莊和河?xùn)|金礦為研究對(duì)象,對(duì)其地質(zhì)特征:礦體特征、礦物特征和礦石特征以及構(gòu)造控礦性質(zhì)、硫同位素、流體包裹體、稀土元素特征和成礦時(shí)代等方面進(jìn)行歸納分析進(jìn)而總結(jié)望兒山斷裂的礦床特征和控礦特征,探討礦床成因。通過以上研究取得以下認(rèn)識(shí):1、斷裂帶內(nèi)的礦體嚴(yán)格受到NNE向的構(gòu)造控制,斷裂的上下盤均有礦化蝕變和礦體產(chǎn)出,礦體多呈脈狀產(chǎn)出且主斷裂面附近的礦床大多平行于斷裂面產(chǎn)出但礦體多產(chǎn)于下盤;斷裂產(chǎn)狀急劇變化處易于成礦,礦體具有等距分布的特點(diǎn)。2、河?xùn)|和上莊的流體包裹體測(cè)定結(jié)果表明望兒山斷裂中段的金礦床包裹體類型有液相包裹體、氣液兩相包裹體且這二種類型包裹體較為集中發(fā)育,成礦流體中成礦溫度為210~330℃;成礦流體的鹽度為4.06~12.86 wt.%NaCl;成礦壓力43.51~76.48MPa,成礦深度5.28~7.26km,深部找礦潛力巨大。3、硫同位素和氫氧同位素研究表明斷裂帶上的礦床為殼幔混合巖漿熱液成因,在礦床的演化形成過程當(dāng)中幔源物質(zhì)參與了成礦,在礦床形成的早期階段以巖漿水為主,隨著成礦的進(jìn)行后期有大氣降水的加入;在成礦時(shí)代上與郭家?guī)X型花崗巖關(guān)系密切;礦區(qū)內(nèi)的脈巖多與礦床共生或穿切礦床,可以很好的指示找礦。
[Abstract]:Jiaodong Peninsula is the largest gold mineralization province in China. Although it accounts for 0.3% of the country's national territory, it occupies 25% of the total gold reserves in China. Jiaojia-Xincheng and other three fault zones. Previous scholars have paid more attention to the study of large faults such as the Jiaojia fault. However, there are few studies on sub-primary faults (such as Houjia fault, Wangershan fault, etc.) of large-scale faults in the region. The Wangershan fault is the main ore-controlling and ore-bearing fault in the study area. On the basis of summarizing the previous studies in this area, this paper takes Shangzhuang and Hedong gold deposits in the middle section of the Wangershan fault as the research objects, and analyzes its geological characteristics: orebody characteristics. Mineral and ore characteristics as well as structural ore-controlling properties, sulfur isotopes, fluid inclusions, rare earth elements and metallogenic ages are summarized and the ore deposit characteristics and ore-controlling characteristics of Wangershan fault are summarized. The ore bodies in the fault zone are strictly controlled by the NNE direction structure, and there are mineralization alteration and orebody occurrence in the upper and lower face of the fault. The ore bodies are mostly vein shaped and the deposits near the main fault surface are mostly parallel to the fault surface, but the ore bodies mostly occur in the lower face, and where the fault occurrence changes sharply, the ore bodies are easy to be mineralized. The ore bodies have the characteristics of equidistant distribution. The results of fluid inclusions determination in Hedong and Shangzhuang show that the inclusions of the gold deposits in the middle section of Wangershan fault have liquid inclusions, gas-liquid two-phase inclusions, and these two types of inclusions are relatively concentrated. The ore-forming temperature of ore-forming fluid is 210 ~ 330 鈩，

本文編號(hào)：1617477