本文關(guān)鍵詞： 鈾礦床 火山機(jī)構(gòu) 流紋斑巖 成礦規(guī)律　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：張麻井鈾鉬礦床是我國(guó)北方重要的鈾礦床,位于華北陸塊北緣,屬于燕遼成礦帶的西段。本文依托《華北陸塊北緣鈾多金屬礦綜合評(píng)價(jià)技術(shù)研究》項(xiàng)目,對(duì)張麻井礦床進(jìn)行地質(zhì)特征及成礦規(guī)律研究。在野外地質(zhì)調(diào)查及前人資料基礎(chǔ)之上,對(duì)礦床的賦礦圍巖、構(gòu)造格架、礦體特征、礦石學(xué)特征、圍巖蝕變特征及元素地球化學(xué)特征進(jìn)行了系統(tǒng)研究;厘定了成礦時(shí)代,討論成礦物質(zhì)來(lái)源與礦床成因,總結(jié)成礦規(guī)律。主要研究成果如下:(1)張麻井礦床的鈾主要來(lái)源于張家口組三段火山熔巖及碎屑巖與流紋斑巖,二者同為殼源重熔產(chǎn)物,為礦床的主要賦礦圍巖。(2)構(gòu)造格架是礦床形成的重要前提條件。斷裂F45控制區(qū)域地層、礦床及火山機(jī)構(gòu)的分布,與次級(jí)斷裂F3交匯部位的火山機(jī)構(gòu)有流紋斑巖體侵入,也為成礦流體提供運(yùn)移通道及容礦空間。(3)張麻井礦床圍巖蝕變有多種類型,中低溫礦物共存,且具有分帶特征,大致可以劃為鉀化帶、泥化帶和硅化-褐鐵礦化帶。(4)礦石中Fe、Ti、Mn、P元素相對(duì)富集,U與In、Bi、Be、Cr、Co、Ni、V、Cu、Sc、Cs、Ga、Th、Zn等元素具有一定的相關(guān)性,與流紋巖及流紋斑巖相比礦石具有更為明顯的Eu異常。(5)張麻井礦床鈾分為三個(gè)成礦期:第一期鈾成礦與流紋斑巖的形成密切相關(guān);第二期鈾成礦屬于熱液脈型;第三期鈾成礦是對(duì)第一期鈾礦體的次生富集,屬淋濾型。(6)控礦主斷裂與次級(jí)斷裂結(jié)點(diǎn)上的火山機(jī)構(gòu)+(超)淺成斑巖體+張家口組三段火山巖系這種多地質(zhì)要素的耦合是張麻井礦床鈾成礦的關(guān)鍵。
[Abstract]:The Zhangmajing uranium and molybdenum deposit is an important uranium deposit in the north of China, which is located in the northern margin of the North China continent and belongs to the western section of the Yanliao metallogenic belt. On the basis of field geological investigation and previous data, the ore-bearing surrounding rock, tectonic framework, orebody characteristics and mineralogical characteristics of the deposit are studied. The alteration characteristics and element geochemical characteristics of surrounding rock are systematically studied. The metallogenic age is determined and the source of ore-forming material and the genesis of the deposit are discussed. The uranium of Zhangmajing deposit is mainly derived from volcanic lava, clastic rock and stream porphyry in the third member of Zhangjiakou formation, both of which are the product of crust-source remelting. The tectonic framework is an important prerequisite for the formation of the deposit. The fault F45 controls the distribution of regional strata, deposits and volcanic bodies. The volcanic mechanism at the junction of the secondary fault F3 has the intrusions of the fluvial porphyry, and also provides the migration passage and the ore-bearing space for the ore-forming fluid. There are many types of alteration in the surrounding rock of the Zhangma well deposit, and the intermediate-low temperature minerals coexist. The ore is characterized by zonation, which can be divided into potassium zone, mudding zone and silication-limonitization zone. There is a certain correlation between the elements such as CsGa-Th Zn and so on. Compared with rhyolite and rhyolitic porphyry, the ore has more obvious EU anomaly. 5) uranium deposit in Zhangmai well is divided into three metallogenic periods: the first stage of uranium mineralization is closely related to the formation of fluid porphyry; The second stage of uranium mineralization belongs to hydrothermal vein type; The third stage of uranium mineralization is secondary enrichment of the first stage uranium orebody. The coupling of the volcanic rocks of the third member of Zhangjiakou formation is the key to uranium mineralization in the Zhangmajing deposit, which belongs to the leaching type. The volcanic mechanism (ultra) on the node of the main fault and the secondary fault is the coupling of the volcanic rock series of the third member of Zhangjiakou formation.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P619.14;P618.65

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