本文選題：銅礦床 + 礦床成因��； 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：會(huì)理大銅礦銅礦床是四川省重要的中型銅礦床之一,它位于川滇南北向構(gòu)造帶中段與南嶺東西向構(gòu)造帶西延交接部位,處于康滇地軸中生代斷陷盆地—會(huì)理盆地的南西側(cè)。本文通過對(duì)大銅礦銅礦床區(qū)域地質(zhì)背景、礦床地質(zhì)特征等的地質(zhì)資料收集、整理和野外實(shí)地地質(zhì)調(diào)查等工作,并結(jié)合該銅礦床地球化學(xué)特征的研究,對(duì)大銅礦銅礦床的礦床成因有了進(jìn)一步認(rèn)識(shí)。會(huì)理大銅礦銅礦床產(chǎn)于中生代晚白堊世小壩組地層中,小壩組地層巖性為一套河湖相紫紅色碎屑沉積巖。礦區(qū)主要褶皺構(gòu)造為青蛙甲背斜和向斜。礦體呈層狀、似層狀產(chǎn)出,產(chǎn)狀與圍巖基本一致。礦石主要原生金屬礦物為輝銅礦和斑銅礦,次生礦物主要為孔雀石等。礦石結(jié)構(gòu)構(gòu)造比較簡單,主要為結(jié)晶粒狀及溶蝕結(jié)構(gòu)和侵染狀膠結(jié)構(gòu)造。礦體圍巖無明顯蝕變現(xiàn)象。通過對(duì)該礦床地球化學(xué)特征研究表明,含礦圍巖與礦體在常量元素、微量元素、稀土元素的組合上,具有相似的配分特征,顯示它們具同源性,成礦物質(zhì)主要來源于地層建造。礦石鉛同位素組成反映其物質(zhì)來源主要為殼源,而礦石硫同位素δ34S值為-13.3‰~㧏2.8‰,反映硫主要來自沉積物中的硫酸鹽細(xì)菌還原作用和部分生物有機(jī)硫。流體包裹體研究表明低溫低壓條件下的成礦特征。除此之外,本文通過對(duì)該銅礦床成因的研究,還對(duì)大銅礦銅礦床的沉積相和成礦模式做了簡要分析。本文認(rèn)為該銅礦床是屬于河流沉積相沉積,古河道凸岸的濱河床淺灘與成礦作用密切相關(guān)。銅元素的富集成礦作用主要發(fā)生在成巖中期—晚期。成礦環(huán)境為氧化向還原的過度環(huán)境。成礦期大體經(jīng)歷了沉積階段、構(gòu)造運(yùn)動(dòng)階段和構(gòu)造運(yùn)動(dòng)相對(duì)穩(wěn)定階段三個(gè)時(shí)期。成礦物質(zhì)在后期的成巖作用過程中再度活化、轉(zhuǎn)移、富集而成。綜合研究顯示,大銅礦銅礦床為一沉積砂礫巖型層控銅礦床。最后,本文根據(jù)對(duì)大銅礦礦床成因的認(rèn)識(shí),對(duì)大銅礦銅礦床的遠(yuǎn)景找礦指出方向。
[Abstract]:The Huili large copper deposit is one of the most important medium copper deposits in Sichuan Province. It is located at the junction of the middle segment of the southwestern Sichuan-Yunnan trending structural belt and the east-west trending structural belt of Nanling, and is located in the west of the Mesozoic fault-Huili basin on the Kangdian axis. In this paper, the regional geological background and geological characteristics of the copper deposit in Dayu copper deposit are collected, sorted out and investigated in the field, and the geochemical characteristics of the deposit are studied. A further understanding of the genesis of the copper deposit in Dayu copper deposit has been made. The large copper deposit of Huili copper deposit occurred in the late Cretaceous Xiaoba formation of Mesozoic. The lithology of Xiaoba formation is a set of fluvial and lacustrine purplish red clastic sedimentary rocks. The main fold structures in the mining area are frog armour anticline and syncline. The orebody is stratiform, similar to stratiform, and its occurrence is basically the same as that of surrounding rock. The main primary metallic minerals are chalcopyrite and porphyrite, while the secondary minerals are malachite. Ore structure is relatively simple, mainly crystalline granular and dissolution structure and infective cementation structure. There is no obvious alteration phenomenon in the surrounding rock of ore body. By studying the geochemical characteristics of the deposit, it is shown that the ore-bearing surrounding rock and orebody have similar partition characteristics in the combination of major elements, trace elements and rare earth elements, indicating that they are homologous, and the ore-forming materials are mainly derived from stratigraphic formations. The lead isotopic composition of ore shows that its material source is mainly from shell source, while the 未 34 S value of ore sulfur isotope is -13.3 鈥，

本文編號(hào)：1833856