本文關(guān)鍵詞： 石炭紀 火山巖 巖石學特征 火山巖型鐵礦 成礦機理 赤龍峰 東天山　出處：《長安大學》2015年碩士論文　論文類型：學位論文

【摘要】：赤龍峰鐵礦位于新疆東天山覺羅塔格構(gòu)造成礦帶南緣百靈山礦田一帶,該帶是新疆重要的鐵、銅、金多金屬成礦帶。百靈山礦田一帶因成礦地質(zhì)條件獨特、鐵礦資源豐富而備受有關(guān)地質(zhì)工作者的關(guān)注。區(qū)內(nèi)已發(fā)現(xiàn)成型礦床很多處,如紅云灘鐵礦、鐵嶺鐵礦、百靈山鐵礦、赤龍峰鐵礦等,并多伴生有銅礦化等。近年來,眾多學者圍繞成礦帶內(nèi)多個鐵礦開展了大量的地質(zhì)工作,進行了典型礦床解剖分析并取得了豐碩的成果,認為區(qū)域火山作用與成礦作用有密切的關(guān)系。本論文在充分收集前人研究資料基礎(chǔ)上,結(jié)合本人的野外實際工作,綜合分析了赤龍峰鐵礦區(qū)內(nèi)底坎兒組火山巖地質(zhì)特征、地球化學特征。并結(jié)合區(qū)域成礦帶內(nèi)火山作用與成礦作用的關(guān)系,對赤龍峰鐵礦進行了研究分析,獲得了以下主要認識:研究區(qū)石炭紀底坎兒組火山巖分布廣泛,巖石類型多樣。出露巖性主要有玄武巖、安山巖、流紋巖及凝灰?guī)r等,其中以中性、酸性為主,基性巖出露相對較少;巖石組合、巖石地球化學特征顯示,火山巖形成于活動大陸邊緣的島弧環(huán)境中;火山巖的演化與俯沖板片脫水所引起的地幔部分熔融有密切關(guān)系,而巖漿上升過程中的地殼混染起到了很有限的作用。石炭紀火山活動是區(qū)內(nèi)規(guī)模最大的構(gòu)造-巖漿事件,成因上與晚古生代古天山洋的消減-俯沖-碰撞造山過程有關(guān)。區(qū)域內(nèi)礦床的形成與這種巖漿-熱液活動密切相關(guān),火山深部巖漿系統(tǒng)為礦床的形成提供了成礦物質(zhì),火山通道以及火山機構(gòu)中的一系列破碎帶和裂隙帶是礦區(qū)重要的導礦構(gòu)造,為含礦流體的運移與擴散提供了通道。赤龍峰鐵礦床賦存在石炭紀上統(tǒng)底坎兒組火山巖中,礦體明顯受地層控制,呈層狀-似層狀與地層整合接觸。礦石礦物以赤鐵礦(鏡鐵礦)為主,其次為磁鐵礦、褐鐵礦,脈石礦物主要為綠泥石、石英、方解石、絹云母、黃鐵礦等。礦石結(jié)構(gòu)有隱晶-微粒狀、葉片狀,呈條帶狀、細脈狀、塊狀、粉末狀構(gòu)造。圍巖蝕變主要有綠泥石化、硅化、絹云母化等。通過對礦床地質(zhì)特征、地球化學特征的分析,并將其與不同成因類型火山巖型鐵礦床及區(qū)域內(nèi)其它典型礦床的綜合對比分析,認為該礦床的成因類型為海相火山熱液-沉積型。通過對區(qū)域背景、成礦物質(zhì)、成礦熱液、構(gòu)造條件等方面的研究,認為研究區(qū)深部及外圍具有良好的成礦潛力,應該重視深部及外圍的找礦。
[Abstract]:Chilongfeng Iron Mine is located in the southern margin of the Bailing Mountain Orefield on the southern margin of the eastern Tianshan Jolatag structural belt in Xinjiang, which is an important iron, copper and gold polymetallic metallogenic belt in Xinjiang. The Baling Mountain Orefield is characterized by unique metallogenic geological conditions. The rich iron ore resources have attracted the attention of the geologists concerned. In the region, many formed deposits have been discovered, such as Hongyuntan iron ore, Tieling iron ore, Bailingshan iron ore, chilongfeng iron ore, etc. In recent years, most of them have been accompanied by copper mineralization. Many scholars have carried out a lot of geological work around a number of iron ores in the metallogenic belt, carried out anatomical analysis of typical deposits and obtained fruitful results. It is considered that regional volcanism is closely related to mineralization. On the basis of fully collecting the previous research data and combining with my field work, the geological characteristics of volcanic rocks of Dikaner formation in Chilongfeng Iron Mine area are comprehensively analyzed in this paper. Geochemical characteristics. Combined with the relationship between volcanism and mineralization in the regional metallogenic belt, the authors have studied and analyzed Chilongfeng iron ore deposit. The main conclusions are as follows: the volcanic rocks of the Carboniferous Dikaner formation are widely distributed in the study area. There are many types of rocks, such as basalt, andesite, rhyolite, tuff and so on. The volcanic rocks are formed in the island arc environment of active continental margin, and the evolution of volcanic rocks is closely related to the partial melting of the mantle caused by the dehydration of subduction plates. The crustal mixing played a very limited role in the process of magma rising. Carboniferous volcanic activity is the largest tectonic-magmatic event in the region. The genesis is related to the subduction-collision orogenic process in the Paleozoic Paleozoic ocean. The formation of the deposits in the area is closely related to the magmatic hydrothermal activity, and the deep volcanic magmatic system provides the ore-forming materials for the formation of the deposits. Volcanic channels and a series of fracture zones and fracture zones in volcanic bodies are important ore-conducting structures in the mining area, which provide a channel for the migration and diffusion of ore-bearing fluids. The Chilongfeng iron deposit occurs in the volcanic rocks of the Upper Carboniferous Dikaner formation in the Carboniferous. The ore body is obviously controlled by stratigraphy and is in contact with stratiform integration. The ore minerals are mainly hematite, magnetite and limonite, and gangue minerals are mainly chlorite, quartz, calcite, sericite, etc, and the ore bodies are dominated by hematite, magnetite and limonite, and gangue minerals are mainly chlorite, quartz, calcite, sericite, etc. Pyrite and so on. The structure of the ore is crypto-granular, leaf flake, strip, veinlike, massive and powdery. The main alteration of surrounding rock is green mud petrification, silicification, sericite, etc. Through the geological characteristics of the deposit, The geochemical characteristics of the deposit are analyzed and compared with the volcanic ore deposits of different genetic types and other typical deposits in the region. It is concluded that the genetic type of the deposit is marine volcanic hydrothermal sedimentary type. Based on the study of ore-forming material, ore-forming hydrothermal solution and structural conditions, it is considered that the deep and outer regions of the study area have good metallogenic potential, and that attention should be paid to the prospecting in the deep and peripheral areas.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P588.14;P618.31

【引證文獻】

相關(guān)會議論文 前1條

1 唐紅峰;侯廣順;;東天山覺羅塔格構(gòu)造帶石炭紀火山巖研究[A];2006年全國巖石學與地球動力學研討會論文摘要集[C];2006年

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本文編號：1494006