發(fā)布時間：2018-06-04 01:06

  本文選題：易門銅廠 + 地球化學(xué)　； 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：易門銅廠礦床位于揚子地臺西南緣的昆陽裂谷內(nèi),屬易門銅礦帶的東礦帶,是該礦帶的典型礦床之一。本文依托校企合作項目《易門銅廠及外圍銅礦成礦規(guī)律與找礦預(yù)測研究》(編號：KKK0201321099)進(jìn)行選題。論文以銅廠礦床的典型礦體為重點研究對象,針對礦體特征、礦床地球化學(xué)等研究薄弱環(huán)節(jié),在前人研究以及系統(tǒng)的野外工作的基礎(chǔ)上,運用光學(xué)顯微鏡、等離子體質(zhì)譜儀ICP-MS分析,開展同位素測試分析、元素地球化學(xué)及流體包裹體分析等,研究了礦化類型、’礦石組構(gòu)特征、成礦物質(zhì)來源、成礦物理化學(xué)條件等,對礦床地質(zhì)特征、礦床地球化學(xué)以及礦床成因等進(jìn)行研究,取得以下成果和認(rèn)識：1、銅廠礦床的礦化類型主要有兩種,即沉積成巖型和熱液脈狀型銅礦,本文稱之為銅廠式礦體和尖山式礦體。2、銅廠式礦體主要賦存于落雪組中,主要呈層狀和似層狀,礦石礦物為斑銅礦,粒徑在0.05mm-0.50 mm之間,多在0.10mm以下。礦石具有泥-微晶結(jié)構(gòu)、粉-細(xì)晶結(jié)構(gòu),層理構(gòu)造、縫合線構(gòu)造。尖山式礦體產(chǎn)于構(gòu)造較為復(fù)雜的部位,不受層位控制,主要呈網(wǎng)脈狀隨石英-方解石脈分布,礦石礦物主要是黃銅礦,粒徑多在0.05-0.25mm之間,個別大于lmm,礦石具有交代結(jié)構(gòu)、固溶體分離結(jié)構(gòu),網(wǎng)脈狀、浸染狀等構(gòu)造。3、銅廠式礦體中黃鐵礦的Co/Ni介于0.51-1.74之間,平均1.062,顯示沉積-成巖作用成因的特征,而尖山式礦體中黃鐵礦的Co/Ni達(dá)2.65,顯示熱液作用成因。4、硫同位素的研究表明,銅廠式礦體的δ34S呈離散型分布,具沉積成因特征。尖山式礦體的σ34S的分布相對局限,具典型的巖漿硫的特征。尖山式硫源來自深部,在一定程度上受到淺層硫的混染。5、鉛同位素研究表明,銅廠礦床中硫化物Pb同位素數(shù)據(jù)較分散,變化范圍較大,放射性成因Pb很高,鉛的來源具復(fù)雜性。6、銅廠式礦體的成礦物質(zhì)來源于地層,并受后期熱液的影響。礦體受到地層、巖性和巖相古地理的控制,成礦時代與含礦層的時沉積間一致；尖山式礦體的成礦物質(zhì)源于深部,礦體受到構(gòu)造和巖性的影響,成礦時代為晉寧期。7、本礦區(qū)銅礦的成礦總體為一種沉積成巖+深源熱液疊加成礦模式。
[Abstract]:The Yimen copper deposit is located in the Kunyang rift in the southwestern margin of the Yangtze platform. It belongs to the east ore belt of the Yimen copper ore belt and is one of the typical deposits in the ore belt. This paper is based on the cooperation project of school and enterprise < study on metallogenic regularity and Prospecting of Yimen Copper Plant and its periphery copper deposit "(No.: KKK0201321099)." This paper focuses on the typical orebodies of Tongchang ore deposit. Aiming at the weak links of ore body characteristics and deposit geochemistry, based on the previous studies and systematic field work, the optical microscope is used. ICP-MS analysis by plasma mass spectrometer, isotopic analysis, element geochemistry and fluid inclusion analysis have been carried out to study the texture characteristics, ore-forming source, ore-forming physicochemical conditions, etc. The geological characteristics, geochemistry and genesis of the deposit are studied, and the following results and understanding are obtained. There are two main types of mineralization in Tongchang deposit: sedimentary diagenetic type and hydrothermal vein type copper deposit. The orebodies in this paper are called Tongchang orebodies and Jianshan orebodies. The orebodies of Tongchang type mainly occur in the Luoxue formation, which are mainly layered and bedded. The ore minerals are porphyry ore with particle size between 0.05mm-0.50 mm and below 0.10mm. Ore has mud-microcrystalline structure, powder-fine crystal structure, bedding structure, suture structure. The quartz-calcite vein distributes mainly in the quartz-calcite vein of the quartz-calcite vein. The ore mineral is mainly chalcopyrite with the particle size between 0.05-0.25mm and Lmm, and the ore has metasomatic structure. The separation structure of solid solution, reticulate vein and disseminated structure. The Co/Ni of pyrite in Tongchang-type orebody ranges from 0.51-1.74 with an average of 1.062, indicating the characteristics of sedimental-diagenetic genesis. The Co/Ni of pyrite in the Jianshan orebody is 2.65, which indicates that the hydrothermal process is. 4. The study of sulfur isotope shows that the 未 34S of the orebody of Tongchang type is distributed discretely and has the characteristics of sedimentary genesis. The distribution of 蟽 34S in the Jianshan orebody is relatively limited and has the characteristic of typical magmatic sulfur. The quarter-type sulfur source comes from deep and is mixed by shallow sulfur to some extent. The lead isotope study shows that the Pb isotopic data of sulphide in Tongchang deposit are scattered, the range of variation is large, and the radiogenic Pb is very high. The source of lead is complex. 6. The ore-forming material of Tongchang-type orebody comes from strata and is influenced by hydrothermal solution in later stage. The orebody is controlled by strata, lithology and lithofacies paleogeography, and the ore-forming age is consistent with that of ore-bearing strata, and the ore-forming material of Jianshan orebody originates from the deep, and the orebody is influenced by structure and lithology. The metallogenic epoch is Jinning period. The ore-forming model of copper deposit in this mine is a sedimentary diagenetic deep-source hydrothermal superposition metallogenic model.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.41

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本文編號：1975107