本文選題：BIF + 蒼嶧鐵礦��； 參考：《成都理工大學》2017年碩士論文

【摘要】：蒼嶧鐵礦在大地構(gòu)造上位于華北克拉通-魯中隆起之南緣的尼山(白彥)凸起與臨沂凸起(穹斷)交匯部位,是魯西成礦帶最重要的BIF鐵礦床之一。通過近幾年的地質(zhì)工作開展,本區(qū)成礦研究取得了重大進展。本文在收集地質(zhì)資料和野外地質(zhì)調(diào)查的基礎(chǔ)上,綜合前人研究成果,通過礦床地質(zhì)特征和地球化學特征,探討了鐵礦物質(zhì)來源、成礦構(gòu)造環(huán)境以及成礦機制。主要的成果與認識如下:1、礦物主要賦存于泰山巖群山草峪組地層中,鐵礦石主要產(chǎn)于磁鐵石英巖。磁鐵石英巖為自形—半自形粒狀結(jié)構(gòu)。Fe質(zhì)與Si質(zhì)相間分布構(gòu)成礦石的條帶狀構(gòu)造,鐵礦的主要圍巖是黑云變粒巖和斜長角閃巖及部分角閃片巖等。2、磁鐵石英巖全鐵平均含量為33.45%,主量元素主要由SiO2(平均約46.94%)、Fe2O3(平均約18.64%)、FeO(平均約23.57%)組成,富集大離子親石元素Th、Ba、Rb、U;虧損高場強元素Ti、Zr、Nb。礦石的稀土元素含量總體較低,經(jīng)過PAAS標準化處理后,蒼嶧地區(qū)磁鐵石英巖的表現(xiàn)為:輕稀土元素相對虧損,重稀土元素相對富集。其中δEu范圍為:1.35-1.67,平均值為1.52,Eu總體為正異常,但是不明顯,δCe范圍為:0.84-1.01,平均值為0.94,無明顯Ce異常。3、蒼嶧地區(qū)鐵建造的形成與海底熱液活動作用相關(guān)度大,但是根據(jù)Eu異常值判斷可知,距離火山中心較遠。在海水運動的穩(wěn)定期與在缺氧的環(huán)境下硅質(zhì)與鐵質(zhì)相繼沉積,繼而形成條紋狀-條帶狀構(gòu)造,且在沉積的過程中,很少有陸源碎屑物質(zhì)的加入。4、根據(jù)黑云變粒巖和斜長角閃巖投圖顯示,本區(qū)為受火山活動影響的島弧環(huán)境。同時山草峪組黑云變粒巖的原巖為砂質(zhì)、泥質(zhì)巖為主,超基性巖、基性巖石相對較少,表明本區(qū)總體上構(gòu)造環(huán)境相對活躍,形成環(huán)境處在碰撞拼合階段。5、海底火山熱液為主要的成礦物質(zhì)來源,并且距離熱液中心有一定距離,海底火山熱液在海水的搬運下不斷流失,但仍得到了一定的富集。經(jīng)過較大規(guī)模的區(qū)域變質(zhì)作用的改造下,使原有巖石發(fā)生重結(jié)晶作用,促進了鐵質(zhì)的進一步富集。后期巖系在強烈的褶皺作用改造和后期斷裂作用對礦體的形成無決定性作用,但對產(chǎn)出產(chǎn)生重要影響,最終形成了以鐵質(zhì)和硅質(zhì)為主要成分的BIF型鐵礦。
[Abstract]:Cangyi Iron Mine is one of the most important BIF iron deposits in the western Shandong metallogenic belt, which is located at the junction of the Nishan (Baiyan) uplift and the Linyi uplift (Dome) in the southern margin of the North China Craton-Central Shandong uplift. Through geological work in recent years, great progress has been made in metallogenic research in this area. On the basis of collecting geological data and field geological survey and synthesizing the previous research results, through geological and geochemical characteristics of ore deposit, the source of iron ore, metallogenic tectonic environment and metallogenic mechanism are discussed in this paper. The main achievements and understandings are as follows: 1. Minerals mainly occur in the Caoyu formation of Mount Taishan Group and iron ore mainly occurs in magnetite quartzite. The magnetite quartzite is a zonal structure formed by the distribution of Fe and Si phases. The main surrounding rock of iron ore is black cloud granulite, amphibolite and partial hornblende schist, etc. The average total iron content of magnetite quartzite is 33.455.The main elements are mainly composed of Sio _ 2 (average 46.94%), Fe _ 2O _ 3 (average 18.64%) and Fe _ 2O _ 3 (mean about 23.57%). The heavy ion lipophilic element Th _ (+) Ba _ (+) RbN _ (U) is enriched, and the high field strength element Ti ~ (2 +) Zr ~ (2 +) Nb. The content of rare earth elements in ore is generally low. After PaaS standardization, the magnetite quartzite in Cang area is characterized by the relative depletion of light rare earth elements and the relative enrichment of heavy rare earth elements. The 未 EU range is 1.35-1.67, the average value is 1.52 EU positive anomaly, but it is not obvious. The 未 ce range is 0.84 to 1.01and the average value is 0.94. There is no obvious ce anomaly .3.The formation of iron formation in Cangyi area has a strong correlation with submarine hydrothermal activity. But according to the EU outliers, it is far from the center of the volcano. In the stable period of sea water movement and in anoxic environment, siliceous and iron deposits are successively formed, and then striate stripe structure is formed, and in the process of deposition, Few land-based clastic materials are added. According to the maps of black cloud granulite and amphibolite the area is an island arc environment affected by volcanic activity. At the same time, the primary rocks of the black cloud granulites of the Shancaoyu formation are sandy, mainly argillaceous, ultrabasic and relatively few, indicating that the tectonic environment in this area is relatively active in general. The forming environment is at the stage of collision and assembly. The submarine volcanic hydrothermal solution is the main source of ore-forming material and is far from the hydrothermal center. The submarine volcanic hydrothermal fluid is continuously lost under the transport of sea water, but it is still enriched to a certain extent. After the transformation of large scale regional metamorphism, the original rocks are recrystallized, which promotes the further enrichment of iron. The late rock series were not decisive in the formation of orebodies due to strong fold transformation and late fracture, but had an important effect on the formation of ore bodies. Finally, BIF iron ores with iron and siliceous composition as the main components were formed.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.31

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