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

【摘要】：四川省會(huì)理大銅廠銅礦床是西南地區(qū)重要的中型銅礦床,它位于川滇南北向構(gòu)造帶中段的中生代會(huì)理斷陷盆地南西側(cè)。本文在廣泛收集前人資料的基礎(chǔ)上,通過(guò)實(shí)地考察該銅礦床的地層出露、巖性組合、沉積建造、構(gòu)造特征,深入采礦平硐、中段、礦房、選冶廠、尾礦庫(kù)獲得第一手研究資料,再通過(guò)室內(nèi)的綜合分析,深入理解了該礦床的成礦地質(zhì)背景和礦床地質(zhì)特征,對(duì)成礦的控制因素提出了自己的見(jiàn)解,并對(duì)前人的某些觀點(diǎn)提出了修改意見(jiàn)。會(huì)理大銅廠銅礦床產(chǎn)于中生代上白堊統(tǒng)小壩組下段地層中,巖性為一套河流相碎屑沉積,以中-細(xì)礫巖和中-細(xì)粒巖屑長(zhǎng)石砂巖為主。顏色以紫紅色為主,偶夾灰綠色條帶。礦區(qū)主要褶皺構(gòu)造為近南北向的青蛙甲背斜和向斜,斷層僅見(jiàn)于礦區(qū)西北角且規(guī)模較小,對(duì)礦體基本無(wú)影響。礦體剖面上呈層狀、似層狀產(chǎn)出,向東呈疊瓦狀排列;平面上呈蓮藕狀,延伸方向?yàn)榻媳毕�。礦石主要原生金屬礦物為輝銅礦和斑銅礦,次生金屬礦物主要為孔雀石,礦石結(jié)構(gòu)以它形粒狀結(jié)構(gòu)為主,構(gòu)造主要為浸染狀膠結(jié)構(gòu)造,無(wú)明顯圍巖蝕變現(xiàn)象。通過(guò)礦石及圍巖的常微量元素和硫同位素測(cè)試數(shù)據(jù)發(fā)現(xiàn),礦石和圍巖的常微量元素組合及含量擬合度很高,顯示成礦物質(zhì)直接來(lái)自圍巖;硫同位素組成特點(diǎn)表明硫源以硫酸鹽的微生物細(xì)菌還原和有機(jī)質(zhì)還原成因?yàn)橹�。作者在研究該礦床主要控礦因素時(shí)發(fā)現(xiàn):中生代紅盆的煤、銅、鹽三色建造對(duì)砂巖銅礦的成礦控制作用明顯;礦體主要分布于上下隔水層所封閉的高滲透性砂體中;礦床嚴(yán)格受層位控制,小壩組砂礫巖地層為找礦目的層;礦體多產(chǎn)于巖石色調(diào)的淺紫過(guò)渡接觸處;巖石孔隙度、組分粒徑、膠結(jié)物成分都與礦化關(guān)系密切;地下水的性質(zhì)和滲流方向控制了礦質(zhì)的沉淀和礦體的展布方向;通過(guò)對(duì)巖相的分析發(fā)現(xiàn)河床滯留相和心灘相沉積形成了有利于后期地下水滲流的巖性組合;此外區(qū)域地質(zhì)演化控制了斷陷盆地的形成和成礦物質(zhì)的來(lái)源,斷裂打通了流體運(yùn)移的通道,對(duì)成礦流體的形成起到了重要作用。青蛙甲背斜對(duì)大銅廠銅礦床后期的礦體改造富集起到了關(guān)鍵作用。最后作者提出該礦床成因?yàn)槌练e-成巖-改造型砂礫巖型銅礦床,成礦大致經(jīng)歷了成礦前的構(gòu)造運(yùn)動(dòng)階段、礦源層的沉積階段、改造成礦階段和表生氧化四個(gè)階段,并對(duì)改造成礦階段的成礦模式做了簡(jiǎn)要圖解。
[Abstract]:The large Tongchang copper deposit in Huili Sichuan Province is an important medium copper deposit in southwest China. It is located in the south west of the Mesozoic Huili fault depression in the middle segment of the southwestern Sichuan-Yunnan trending tectonic belt. Based on the extensive collection of previous data, this paper has obtained first-hand research data by investigating the strata exposure, lithologic assemblage, sedimentary formation, structural characteristics, deep mining adit, middle section, orehouse, Xuanye factory and tailings reservoir of the copper deposit. Through the laboratory comprehensive analysis, the metallogenic geological background and geological characteristics of the deposit are deeply understood, and the views on the controlling factors of mineralization are put forward, and some opinions of the predecessors are put forward. The Datongchang copper deposit in Huili occurs in the lower member of Xiaoba formation of Upper Cretaceous in Mesozoic. The lithology of the deposit is a set of fluvial clastic deposits, mainly of medium-fine conglomerate and medium-fine-grained lithic feldspathic sandstone. The color is mainly purplish red with grayish green stripes. The main fold structures in the mining area are the frog armour anticline and syncline in the north and south direction. The faults are only found in the northwest corner of the mining area and the scale is small and has no effect on the orebody. The orebody is stratified, like stratiform, imbricate to east and lotus root in plane, extending in the direction of near south to north. The ore is mainly composed of chalcopyrite and porphyrite, the secondary metallic mineral is mainly malachite, the ore structure is dominated by other granular structure, the structure is mainly dyed cemented structure, and there is no obvious wall rock alteration phenomenon. Through the data of trace elements and sulfur isotopes of ore and surrounding rock, it is found that the combination of trace elements and the fitting degree of content of trace elements in ore and surrounding rock are very high, which shows that the ore-forming material comes directly from the surrounding rock. The characteristics of sulfur isotopic composition indicate that the sulfur source is mainly caused by the reduction of sulfate bacteria and the reduction of organic matter. When the authors study the main ore-controlling factors of the deposit, it is found that the coal, copper and salt formations of the Mesozoic red basin have obvious controlling effect on the ore-forming of sandstone-copper deposits, and the orebodies are mainly distributed in the highly permeable sand bodies enclosed by the upper and lower water sealants. The deposit is strictly controlled by the horizon, the gravel strata of Xiaoba formation are the ore-prospecting target layer, the orebody mostly occurs in the light purple transition contact of the rock tone, the porosity of the rock, the particle size of the composition and the composition of the cementation are all closely related to the mineralization. The nature and seepage direction of groundwater control the deposit of mineral material and the direction of distribution of orebody, and through the analysis of lithofacies, it is found that the deposit of retained facies of river bed and the facies of core beach form lithologic assemblages favorable to the late seepage of groundwater. In addition, regional geological evolution controls the formation of faulted basins and the source of ore-forming materials, and the faults open the passage of fluid migration, which plays an important role in the formation of ore-forming fluids. The Yuka anticline plays a key role in the orebody reconstruction and enrichment in the late stage of the Datongchang copper deposit. Finally, the author suggests that the deposit is formed by deposition-diagenesis and remolding sand and conglomerate type copper deposit, which has undergone four stages: tectonic movement stage before mineralization, sedimentary stage of ore source bed, reformation metallogenic stage and supergene oxidation stage. A brief diagram of the ore-forming model in the reformed metallogenic stage is also given.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：P618.41

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本文編號(hào)：1791958