本文選題：嵩山　切入點：BIF　出處：《河南理工大學》2015年碩士論文

【摘要】：嵩山地區(qū)位于華北克拉通南緣,地層出露齊全,是我國前寒武紀地質研究的經典地區(qū)之一,BIF的發(fā)現是嵩山近年地質研究重大進展之一。BIF是條帶狀鐵建造(Banded Iron Formation)的英文簡稱,對于研究前寒武紀地質及鐵礦找礦具有重要意義。本次工作主要依托1:5萬區(qū)域地質調查項目,通過地質剖面測量、地質填圖,采集樣品開展巖礦鑒定、硅酸鹽全分析、微量分析、稀土分析等,研究BIF地質地球化學特征,探討其形成大地構造環(huán)境和原巖性質和來源,取得成果如下:(1)BIF賦存于新太古代登封群金家門組中,主要巖性為磁鐵石英巖及角閃磁鐵石英巖,斜長角閃巖,黑云變粒巖及二云石英片巖等。磁鐵石英巖呈細粒花崗變晶結構,條紋、條帶狀構造,礦物主要為石英(55%~75%)、磁鐵礦(25%~35%)、角閃石(5%±)等。(2)磁鐵石英巖主量元素主要由SiO2、Fe2O3和FeO組成,TFe2O3平均為39.39%,微量元素相對富集K、Rb、Ba、Th等大離子親石元素,虧損Nb、Zr、Hf、Ti等高場強元素;礦石稀土元素含量很低,ΣREE平均為40.95×10-6,經過PAAS標準化后具有輕稀土相對虧損、重稀土相對富集的稀土配分模式;LaN/YbN平均值為0.53;Eu/Eu*平均值為1.31,Eu弱正異常,Ce輕微負異常(Ce/Ce*平均值為0.90)等特征。(3)磁鐵石英巖形成于火山活動間歇期的穩(wěn)定的火山噴氣沉積階段,在缺氧的海水環(huán)境下硅和鐵先后沉積,形成條紋、條帶狀構造,硅和鐵主要來自于火山活動,硅鐵沉積過程中很少有碎屑物質加入。(4)BIF帶原巖主要為基性火山巖、砂泥質沉積巖。角閃巖原巖為基性火山巖,具有島弧拉斑玄武巖和洋中脊玄武巖地球化學特征,指示拉張初期的弧后盆地環(huán)境;變粒巖、二云石英片巖原巖主要為砂質、泥質沉積巖,沉積過程中可能有部分中酸性火山巖加入,指示沉積環(huán)境可能為遠洋盆地靠近大陸邊緣區(qū)域,沉積過程中受到大洋內火山活動的影響。(5)嵩山地區(qū)BIF的地球動力學背景為匯聚板塊邊緣的俯沖環(huán)境。(6)BIF的發(fā)現為嵩山地區(qū)鐵礦找礦指明了方向,今后加強在郭家窯和萬安山BIF帶的南北延伸方向上的找礦工作,可望發(fā)現一定規(guī)模的鞍山式鐵礦床。
[Abstract]:The Songshan area is located in the southern margin of North China Craton, and the strata are well exposed. It is one of the classical areas of Precambrian geological study in China. The discovery of BIF is one of the important advances in recent years in the geological research of Songshan Mountain. BIF is an abbreviation for banded Iron formation of strip iron. It is of great significance for the study of Precambrian geology and ore prospecting. This work mainly relies on the 1: 50 000 regional geological survey project, through geological profile survey, geological mapping, collection of samples to carry out rock and ore identification, and silicate analysis. Trace analysis, rare earth analysis, etc., to study the geological and geochemical characteristics of BIF, and to discuss its tectonic environment, original rock properties and origin. The results are as follows: 1) BIF occurred in the Jinmen formation of the New Archean Dengfeng Group, The main lithologies are magnetite quartzite and hornblende quartzite, amphibolite, biotite granulite and Eryun quartz schist, etc. The magnetite quartzite is of fine granitic texture, striped and striped structure. The main elements of magnetite quartz quartz are mainly composed of Sio _ 2, Fe _ 2O _ 3 and FeO, the average TFE _ 2O _ 3 is 39.39, and the trace elements are relatively enriched in large ion lithophile elements such as K _ (Rb) Ba _ (Th) and depleted high field strength elements such as NB, Zr, HfT _ (Ti). The content of rare earth elements in ore is very low, 危 REE is 40.95 脳 10 ~ (-6) on average. After PAAS standardization, the ore has the relative depletion of light rare earth elements. The rare earth distribution model with relative enrichment of heavy rare earth elements, LaN- / YbN, has a mean value of 0.53 EU / EU * and the average value of 1.31 EU weak positive anomaly ce is slightly negative anomaly. The average value of ce / ce * is 0.90)) the magnetite quartzite is formed during the stable volcanic exhalation stage during the period of volcanic activity interval. In anoxic seawater environment, silicon and iron have been deposited successively, forming stripes and banded structures, silicon and iron are mainly derived from volcanic activity. During the deposition of ferrosilicon, very few clastic materials are added to the original rocks of the BIF belt, which are mainly basic volcanic rocks. Sandy argillaceous sedimentary rocks. Amphibolites are basic volcanic rocks with geochemical characteristics of island arc tholeiite and mid-oceanic ridge basalt, indicating the back-arc basin environment in the early tensioning stage, metamorphic rocks, eryun quartz schist protolites are mainly sandy, The muddy sedimentary rocks may be joined by some intermediate-acid volcanic rocks during the deposition process, indicating that the sedimentary environment may be near the continental margin of the ocean-going basin. The geodynamic background of BIF in Songshan area is the subduction environment of convergent plate margin. The discovery of BIF indicates the direction of iron ore prospecting in Songshan area. In the future, it is expected to find a certain scale Anshan iron deposit by strengthening the prospecting work in the north-south extension direction of Guojiayao and Wananshan BIF belt.
【學位授予單位】：河南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P618.31

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