本文選題：敖侖花鉬銅礦 + 半砬山鉬礦　； 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：內(nèi)蒙古敖侖花鉬銅礦和半砬山鉬礦床位于華北克拉通北緣西拉木倫河成礦帶的北側(cè),是典型的斑巖型鉬礦床。本文以敖侖花鉬銅礦和半砬山鉬礦床為研究對(duì)象,根據(jù)礦區(qū)地質(zhì)、礦體、巖石地球化學(xué)、年代學(xué)特征以及鉬礦成因,對(duì)兩礦床進(jìn)行初步對(duì)比研究,分析總結(jié)兩礦床的共性、差異性以及其中的原因及聯(lián)系。地質(zhì)特征、年代學(xué)對(duì)比研究表明,兩礦區(qū)的地層、巖漿巖類型基本相同,巖漿活動(dòng)的時(shí)間和類型基本相同,都是早白堊世中酸性巖漿的產(chǎn)物。礦體特征對(duì)比研究表明,礦體均呈似層狀透鏡體形態(tài)產(chǎn)出,主要受斑巖體控制。敖侖花礦床的礦石組分以鉬銅為主、半砬山礦床礦石組分以鉬為主,礦石組構(gòu)有差異。礦床的圍巖蝕變及分帶不同,敖侖花鉬銅礦床與成礦關(guān)系密切主要的是硅化和鉀化;而半砬山鉬礦床與成礦關(guān)系密切最主要的是黃鐵絹英巖化。石英脈與鉬成礦有著緊密聯(lián)系,通過(guò)研究石英脈的分布、形態(tài),可以預(yù)測(cè)鉬礦化的趨勢(shì)。兩礦床賦礦斑巖體的巖石地球化學(xué)特征相似,斜長(zhǎng)花崗斑巖和花崗閃長(zhǎng)斑巖都屬于準(zhǔn)鋁質(zhì)高鉀鈣堿性I型花崗巖,具有埃達(dá)克巖特征。富集Rb、Ba、K、Th、U等大離子親石元素和Zr、Hf等高場(chǎng)強(qiáng)元素,相對(duì)虧損Ta、Nb、Ti等高場(chǎng)強(qiáng)元素。稀土元素配分曲線均成右傾的輕稀土富集型曲線,負(fù)Eu異常不明顯。流紋斑巖在敖侖花礦床中以脈巖體形式出現(xiàn),屬于過(guò)鋁質(zhì)高鉀鈣堿性A型花崗巖;而在半砬山鉬礦床中主要為圍巖,屬于準(zhǔn)鋁質(zhì)高鉀鈣堿性A型花崗巖。均具有低Sr,高Y、Yb的特征,微量元素含量差別較大。兩礦床中成礦物質(zhì)主要來(lái)自殼源,但有少部分幔源物質(zhì)混入,形成于早白堊世由擠壓向伸展過(guò)渡的構(gòu)造環(huán)境下。半砬山鉬礦床與敖侖花鉬銅礦床成因具有相似性和內(nèi)在聯(lián)系。
[Abstract]:The Oolun molybdenum copper deposit and the half Lashan molybdenum deposit are typical porphyry molybdenum deposits located in the northern margin of the North China Craton on the northern side of the Xilamulunhe metallogenic belt. In this paper, based on the ore area geology, orebody, rock geochemistry, geochronology and origin of molybdenum ore deposit, this paper makes a preliminary comparative study on the two deposits, and analyzes and sums up the commonness of the two deposits, taking the Oolun molybdenum copper deposit and the Bilashan molybdenum deposit as the research objects. Difference and its causes and connections. A comparative study of geological characteristics and geochronology shows that the strata and magmatic types of the two mining areas are basically the same, and the time and type of magmatic activity are basically the same, which are all the products of early Cretaceous intermediate-acid magma. The comparative study of orebody features shows that the orebodies are lenticular and mainly controlled by porphyry. The ore composition of the Aolunhua deposit is mainly molybdenum and copper, and the ore composition of the hemilashan deposit is molybdenum, and the ore fabric is different. The wall rock alteration and zonation of the deposit are different. The Oolun molybdenum copper deposit is closely related to metallogeny mainly by silicification and kalitization, while the hemilashan molybdenum deposit has the most close relationship with metallogeny, which is mainly yellow sericite. Quartz vein is closely related to molybdenum mineralization, and the trend of molybdenum mineralization can be predicted by studying the distribution and morphology of quartz vein. The petrogeochemical characteristics of the ore-bearing porphyry bodies of the two deposits are similar. Both the plagioclase granitic porphyry and granodiorite are quasi-aluminous high-potassium calc-alkaline I-type granites with the characteristics of adakite. Large ion lithophile elements, such as RbBX, Bazao, Ki, Thu and ZrHf, are enriched, and the high field strength elements such as Ta-Nb-Ti are relatively depleted. The distribution curves of rare earth elements are all light rare earth enrichment curves with right inclination, but negative EU anomalies are not obvious. The fluvial porphyry appears in the form of vein rock in the Aolunhua deposit and belongs to the peraluminous high-potassium calc-alkaline A-type granite, while in the Banlashan molybdenum deposit it is mainly surrounding rock and belongs to the quasi-aluminous high-potassium calc-alkaline A-type granite. All of them have the characteristics of low Srand high YYb, and the content of trace elements varies greatly. The ore-forming materials in the two deposits mainly come from crust source, but a few mantle materials are mixed in, which formed in the tectonic environment of early Cretaceous transition from compressional to extensional. There is a similarity and intrinsic relation between the Boulashan molybdenum deposit and the Oolun molybdenum copper deposit.
【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)】：P618.41;P618.65

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