本文選題：易門(mén)銅廠 + 中昆陽(yáng)群��； 參考：《昆明理工大學(xué)》2015年碩士論文

【摘要】：云南易門(mén)銅礦帶是滇中地區(qū)重要的銅資源礦區(qū),銅廠礦區(qū)屬易門(mén)東礦帶的重要礦床之一。本文依托“易門(mén)銅廠及外圍銅礦成礦規(guī)律與找礦預(yù)測(cè)研究項(xiàng)目”進(jìn)行選題。通過(guò)野外地質(zhì)調(diào)查,銅廠礦區(qū)沉積—成巖成礦特征明顯,選取銅廠礦區(qū)中昆陽(yáng)群落雪組地層(主含礦層)為研究對(duì)象。從含礦層地層厚度的時(shí)空變化、沉積構(gòu)造、巖石組合、沉積微相特征、巖石地球化學(xué)特征等方面的研究,得出了礦區(qū)古沉積環(huán)境特征,并總結(jié)了沉積相模式,最終闡明了沉積環(huán)境與沉積成巖型礦體的關(guān)系。取得的認(rèn)識(shí)有：1、對(duì)云南省易門(mén)銅廠礦區(qū)中昆陽(yáng)群落雪組地層做了空間及時(shí)間上的對(duì)比研究,發(fā)現(xiàn)沿NE-SW方向上銅廠礦區(qū)古沉積盆地存在“兩凹夾一隆”構(gòu)造格局,且NE側(cè)(17線以北)含礦性較好,SW側(cè)(23線以南)含礦性差,礦化較弱。2、參照八十年代Flugel和Wilson的碳酸鹽巖基本相模型和微相類(lèi)型,并且依據(jù)野外現(xiàn)場(chǎng)調(diào)查和室內(nèi)薄片鑒定,把落雪組白云巖分為八個(gè)微相類(lèi)型,分別為MF1微晶—粉晶白云巖、MF2紋層狀白云巖、MF3鮞狀白云巖、MF4藻屑白云巖、MF5碎屑白云巖、MF6硅質(zhì)白云巖、MF7硅化白云巖、MF8泥質(zhì)白云巖。3、本文對(duì)研究區(qū)主含礦層白云巖主量元素、微量元素、稀土元素的沉積地球化學(xué)特征的研究表明：①不同巖石類(lèi)型化學(xué)成分不同,與巖石巖性關(guān)系密切�？傮w上看落雪組一段(Pt2l1)白云巖SiO2+Al2O3平均值高,顯著富含陸源物質(zhì)(泥質(zhì)),屬高雜質(zhì)白云巖類(lèi)。落雪組二段(Pt2l2)白云巖普遍含硅質(zhì)條帶或硅質(zhì)團(tuán)塊,CaO+MgO平均值高,Al2O3低,SiO2高,屬硅質(zhì)白云巖類(lèi)。落雪組三段(Pt2l3)白云巖成分與落雪組二段總體相似。主要含礦層落雪組二段(Pt2l2)中的Cu、Co、Ba、 Zn、Sb平均含量相對(duì)落雪組一、三段(Pt2l1,Pt2l3)較高,這與礦化有關(guān)。不同巖石類(lèi)型樣品稀土元素配分模式都具有明顯右傾趨勢(shì),輕稀土富集,重稀土相對(duì)虧損。落雪組二段δEu平均值為0.78,顯示輕微-中等負(fù)Eu異常,反映整個(gè)地層沉積環(huán)境偏還原性,礦區(qū)北部Eu異常較為明顯。②沉積地球化學(xué)指標(biāo)[Sr/Ba、B/Ga、m、V/(V+Ni)、Fe2+/Fe3+、Mg/Ca、 Sr/Cu]反映,落雪組沉積期沉積環(huán)境經(jīng)歷了弱還原(Pt2l1)→還原(Pt2l2)→弱還原(Pt2l3)和近岸-海水環(huán)境(Pt2l1)→半咸水(Pt2l2-Pt2l3)的演化過(guò)程。在空間上,落雪組第二段沉積期,北部潮坪洼地具高鹽度(Sr/Ba=0.540,B/Ga=4.011)和還原性強(qiáng)(Fe2+/Fe3+=14.706)等標(biāo)志,南部潮坪洼地具中鹽度(Sr/Ba=0.25, B/Ga=2.6)和還原性較弱(Fe2+/Fe3+=2.54)特征。4、含礦層沉積相標(biāo)志研究表明,中部隆起(潮坪礁灘相)錐狀、球狀、柱狀疊層石發(fā)育,可見(jiàn)波狀層理、透鏡狀層理構(gòu)造和沖刷構(gòu)造,水動(dòng)力較強(qiáng)。南部和北部潮坪洼地層狀或不規(guī)則條帶狀疊層石發(fā)育。北部潮坪洼地相可見(jiàn)紋層狀構(gòu)造、包卷層理、斜層理、波狀層理、沖刷構(gòu)造、擾動(dòng)構(gòu)造等,水動(dòng)力強(qiáng)-較強(qiáng)。南部潮坪洼地相常見(jiàn)紋層狀構(gòu)造,水動(dòng)力較強(qiáng)-較弱。5、宏觀地質(zhì)、巖石地球化學(xué)及沉積相研究表明,礦區(qū)沉積成巖型礦化在很大程度上受控于巖相古地理環(huán)境,17線以北的潮坪洼地相為相對(duì)封閉的低能帶,海水鹽度較高、處于相對(duì)還原環(huán)境,利于成礦物質(zhì)聚集,沉積成巖型礦體發(fā)育較好,是主要成礦地段。23線以南的潮坪洼地與外海溝通較好,封閉性較差,海水鹽度中等,處于弱還原環(huán)境,不利于成礦物質(zhì)聚集。
[Abstract]:The Yunnan Yimen copper mine belt is an important copper resource mining area in Central Yunnan, and copper factory mining area is one of the most important ore deposits in the Yimen east ore belt. This article is based on the "Yimen copper plant and the peripheral copper ore metallogenic law and prospecting prediction research project". In the middle Kunyang community, the snow formation (main ore bearing layer) is the research object. From the temporal and spatial variation of the thickness of the stratum, the sedimentary structure, rock assemblage, the characteristics of sedimentary microfacies and the geochemical characteristics of the rock, the characteristics of the paleosedimentary environment of the mining area are obtained, and the sedimentary facies model is summarized, and the sedimentary environment and sedimentary rock type ore are finally clarified. The understanding of the body is as follows: 1, a comparative study was made on the space and time of the Kunyang community snow formation in the Yunnan Yimen copper factory mining area. It was found that there was a structural pattern of "two concave clips one uplift" in the ancient sedimentary basin along the NE-SW direction, and the ore bearing property of the NE side (north of the 17 line) was better, and the mineralization was poor in the SW side (23 lines to the South), and mineralization was poor. Weak.2, referring to the basic facies model and microfacies type of the carbonate rock of Flugel and Wilson in 80s, and according to field investigation and laboratory examination, the snow formation dolomite is divided into eight microfacies types, which are MF1 microcrystalline dolomite, MF2 lamellar dolomite, MF3 oolitic dolomite, MF4 algal dolomite, MF5 detrital white cloud. Rock, MF6 siliceous dolomite, MF7 silicified dolomite and MF8 argillaceous dolomite.3. This paper studies the sedimentary geochemical characteristics of main elements, trace elements and rare earth elements of the main ore bearing dolomite in the study area: (1) the chemical composition of different rock types is different and closely related to rock lithology. In general, the snowrock group A (Pt2l1) dolomite SiO The average value of 2+Al2O3 is high, which is rich in terrestrial material (mud) and belongs to high impurity dolomite. The two (Pt2l2) dolomite of the snowfall group generally contains siliceous or siliceous masses, the average value of CaO+MgO is high, the Al2O3 is low, and the SiO2 is high, which belongs to the siliceous dolomite. The three segment of the snow formation (Pt2l3) is similar to the two segment of the snow group. The average content of Cu, Co, Ba, Zn, Sb in the two section (Pt2l2) is relatively high in one or three segments (Pt2l1, Pt2l3), which is related to mineralization. The distribution patterns of rare earth elements in different rock types have obvious right tendency, light rare-earth enrichment and relative loss of heavy rare earth. The two segment of the two segment of the falling snow group is 0.78, showing a mild medium negative Eu anomaly. The sedimentary environment of the whole stratum is partial reduction, and the Eu anomaly in the northern part of the mining area is more obvious. (2) the sedimentary geochemistry index [Sr/Ba, B/Ga, m, V/ (V+Ni), Fe2+/Fe3+, Mg/Ca, Sr/Cu] reflected, and the sedimentary environment of the snow formation period experienced the weak reduction (Pt2l1), reduction (Pt2l2), weak reduction (Pt2l3) and coastal seawater environment. Evolution process. In space, the sedimentary period of the second section of the snowfall group, the northern tidal flat has high salinity (Sr/Ba=0.540, B/Ga=4.011) and reducing strong (Fe2+/Fe3+=14.706) marks, the South tidal flat depression with the middle salinity (Sr/Ba=0.25, B/Ga=2.6) and the weaker (Fe2+/Fe3+ =2.54) characteristic.4, the sedimentary facies mark of the mineral layer shows that the middle uplift (tide) Taper reef beach facies, cone shaped, spherical and columnar stratified bedding, visible wave bedding, lenticular bedding structure and scour structure, strong hydrodynamic force. The stratiform or irregular stripe strate strate rocks are developed in the South and North tidal flat. The northern tidal flat is visible lamellar structure, coiling bedding, diagonal bedding, wave bedding, scour structure, disturbance structure, etc. The hydrodynamic force is strong. The common striate structure in the South tidal flat, the strong hydrodynamic - weak.5, the macroscopic geology, the rock geochemistry and sedimentary facies studies show that the sedimentary diagenetic mineralization of the mining area is largely controlled by the lithofacies palaeogeographic environment, and the tidal flat in the north of the 17 line is relatively closed low energy zone, and the salinity of the sea water is high. In the relative reduction environment, it is beneficial to the accumulation of minerals, and the sedimentary orebodies are well developed. It is better to communicate with the outside sea in the tidal flat of the main metallogenic section of the.23 line in the south. The sealing property is poor, the salinity of the sea water is medium, and it is in the weak reduction environment, which is not conducive to the accumulation of minerals.

【學(xué)位授予單位】：昆明理工大學(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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