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  本文選題：拉么鋅銅礦 + 矽卡巖��； 參考：《中國地質大學(北京)》2017年碩士論文

【摘要】：拉么鋅銅礦床是丹池成礦帶中段大廠礦田內重要的礦床。本文在總結分析前人對該礦床各方面研究成果基礎上,通過野外地質調查研究和多種分析測試手段,開展了拉么礦床地質特征、巖石與黃鐵礦單礦物微量稀土元素、輝鉬礦年代學研究等,對比了兩種類型礦體地球化學特征、成礦物質來源、成礦流體來源、成礦年代,探討了二者之間的成因聯(lián)系,查明拉么礦床成因。研究主要取得如下認識:(1)識別出脈狀與層狀礦體在金屬礦物組合上的相似性。主要以黃鐵礦、鐵閃鋅礦、黃銅礦、磁黃鐵礦、毒砂及少量輝鉬礦等為主。脈狀礦石以角礫狀構造、浸染狀構造為主,層狀礦石以塊狀構造、條帶狀構造為主。通過野外調查初步查清了地表蝕變類型主要有:矽卡巖化、硅化、大理巖化、電氣石化、褐鐵礦化。(2)拉么鋅銅礦兩類礦體中黃鐵礦單礦物的稀土元素和微量元素組成特征相似,表明成礦流體來源與性質相似。結合前人流體包裹體及H-O同位素研究表明,其成礦流體主要來源于巖漿,并受到后期大氣降水的混合,為形成于中—高溫和較還原環(huán)境下的富Cl流體。同時二者在稀土和微量元素地球化學特征上與籠箱蓋巖體較為相似,表明它們具有密切的成因聯(lián)系。二者S、Pb同位素組成特征相似,表明二者成礦物質來源相似。成礦物質主要來源于地殼,并有幔源成分的加入,屬于殼�；旌蟻碓�,表明成礦物質來源于殼�；煸吹膸r漿。(3)層狀礦體和脈狀礦體中輝鉬礦模式年齡分別為91.36±1.47~93.27±1.53Ma和90.97±1.74Ma,其年齡基本一致,表明二者是同一成礦期的產物。二者等時線年齡為91.55±0.67,與籠箱蓋黑云母花崗巖年齡91.63±0.28Ma接近,反映了礦體的形成與籠箱蓋巖體的侵位具有密切的關系。(4)拉么鋅銅礦床為泥盆系碳酸鹽地層賦礦、巖體提供成礦物質以及成礦流體的典型巖漿-熱液作用形成的矽卡巖型礦床,并建立深部貢獻—垂向運移—側向交代成礦的成礦模式。
[Abstract]:Lamo zinc copper deposit is an important deposit in Dachang Orefield in the middle section of Danchi metallogenic belt.On the basis of summing up and analyzing all aspects of previous researches on the deposit, through field geological investigation and various analytical and testing methods, this paper has carried out the geological characteristics of the Lemo deposit, the trace rare earth elements of single mineral rocks and pyrite.The geochemical characteristics of two types of orebodies, the source of ore-forming material, the source of ore-forming fluid and the metallogenic age are compared. The genetic relationship between them is discussed and the genesis of the Lemo deposit is found out.The main results of this study are as follows: (1) identifying the similarity of vein and stratiform ore bodies in metal mineral assemblages.Mainly pyrite, sphalerite, chalcopyrite, pyrrhotite, arsenopyrite and a small amount of molybdenum.Vein ore is breccia structure, disseminated structure is dominant, stratiform ore is block structure, stripe structure is dominant.Through field investigation, the main types of surface alteration are as follows: skarn, silicification, marble, electrical petrochemical, limonitization, etc.) the characteristics of the rare earth elements and trace elements of the pyrite single minerals in the two types of orebodies of Lamo zinc copper deposit are similar.It is shown that the source and properties of ore-forming fluids are similar.Combined with previous fluid inclusions and H-O isotopic studies, it is shown that the ore-forming fluids are mainly derived from magma and mixed by late atmospheric precipitation, which are Cl rich fluids formed in medium-high temperature and relatively reduced environments.At the same time, the geochemical characteristics of rare earth elements and trace elements are similar to those of the cage caprock, indicating that they are closely related to each other.The characteristics of the isotopic compositions of Pb and S _ 2O _ 2 are similar, indicating that the source of the ore-forming material is similar between them.The ore-forming materials are mainly derived from the crust, with the addition of mantle-derived elements, and belong to the crust-mantle mixed source.The results show that the molybdenum model ages of laminar orebodies and vein orebodies are 91.36 鹵1.47, 93.27 鹵1.53Ma and 90.97 鹵1.74 Ma.The ages are basically the same, indicating that they are the products of the same metallogenic period.The isochron age is 91.55 鹵0.67, which is close to the age of 91.63 鹵0.28Ma of the cage cover biotite granite, which indicates that the formation of the orebody is closely related to the emplacement of the cagon-covered rock mass.The rock mass provides skarn type deposits formed by typical magma hydrothermal interaction of ore-forming fluids and establishes a metallogenic model of deep contribution vertical migration and lateral metasomatism.
【學位授予單位】：中國地質大學(北京)
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.4

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