本文選題：皖南　切入點(diǎn)：青陽　出處：《合肥工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本文依托中國地質(zhì)調(diào)查局項(xiàng)目《長江中下游成礦帶中段深部地質(zhì)調(diào)查》,在系統(tǒng)收集和全面了解區(qū)域地質(zhì)背景的基礎(chǔ)上,選擇區(qū)內(nèi)典型的青陽-九華山復(fù)式巖體及其北部的高家X]、百丈巖鎢鉬礦床為研究對(duì)象。通過野外地質(zhì)調(diào)查及室內(nèi)綜合鑒定,結(jié)合巖石地球化學(xué)分析、鋯石U-Pb同位素定年、輝鉬礦Re-Os定年、礦物電子探針等方法,探討青陽-九華山復(fù)式巖體的形成過程,解析鎢鉬礦床的成礦機(jī)制。取得如下主要成果：高精度鋯石U-Pb同位素定年得出：青陽-九華山復(fù)式巖體由四個(gè)階段巖漿侵入形成的,從早到晚花崗閃長巖、二長花崗巖、鉀長花崗巖、細(xì)�；◢彴邘r形成年齡分別為143.3±1.0Ma、37.6±1.5Ma、331.3±1.2Ma、132.0±2.0Ma。高家X]礦床花崗閃長巖和細(xì)粒花崗閃長斑巖的鋯石U-Pb同位素年齡分別為144.9±1.2Ma和145±2Ma。高家X]、百丈巖礦床相關(guān)的巖漿巖分別對(duì)應(yīng)青陽-九華山復(fù)式巖體早期第一階段和晚期第四階段,是復(fù)式巖體演化過程中的產(chǎn)物。巖石主量元素、微量元素、造巖礦物電子探針分析等研究表明,青陽-九華山復(fù)式巖體及鎢鉬礦相關(guān)巖漿巖均為殼幔源,可能來自相同的初始巖漿房,屬于高鉀鈣堿性系列,準(zhǔn)鋁質(zhì)-弱過鋁質(zhì)。電子探針分析表明：高家X]礦床矽卡巖中輝石為透輝石-鈣鐵輝石系列,石榴子石為鈣鋁榴石-鈣鐵榴石系列。其成分與百丈巖礦床差異較大,表明矽卡巖鎢鉬礦床中石榴子石和輝石成分不具有專屬性。高家X]礦床石榴子石環(huán)帶及共生石榴子石-輝石礦物對(duì)成分特征表明成礦環(huán)境是變化的,在巖漿流體出溶后,體系酸度升高、氧逸度降低,逐漸過渡到相對(duì)還原的環(huán)境。通過輝鉬礦Re-Os定年方法,得到高家X]礦床成礦時(shí)代為146.1±4.8Ma。并結(jié)合已有資料,將皖南地區(qū)燕山期發(fā)育的鎢鉬礦床分為兩期,分別為146-136Ma和134-128Ma。分別從礦區(qū)地層、構(gòu)造及巖漿巖與成礦的關(guān)系方面探討了成礦地質(zhì)條件,并建立礦床的成礦模式,提出了找礦標(biāo)志。本次工作增強(qiáng)了皖南地區(qū)燕山期鎢鉬礦床成礦規(guī)律的認(rèn)識(shí),并且對(duì)皖南地區(qū)后續(xù)的鎢鉬多金屬礦產(chǎn)勘查具有一定的實(shí)際指導(dǎo)意義。
[Abstract]:Based on the project of China Geological Survey, "Deep Geological Survey of the Middle and Lower reaches of the metallogenic Belt of the Yangtze River", this paper systematically collects and comprehensively understands the regional geological background. The typical Qingyang-Jiuhuashan complex and its northern Gaojia X are selected as the research objects. Through field geological investigation and laboratory comprehensive identification, zircon U-Pb isotopic dating is carried out in combination with geochemistry analysis. The formation process of Qingyang-Jiuhuashan complex rock mass is discussed by means of Re-Os dating and mineral electron probe. The main results are as follows: high precision zircon U-Pb isotopic dating shows that the Qingyang-Jiuhuashan complex intruded by four stages of magma, granodiorite from early to late, monzomorphic granodiorite, monzomorphic granodiorite, granodiorite, monzogranite, etc. Potassium feldspar granite, The zircon U-Pb isotopic ages of granodiorite and fine-grained granodiorite are 144.9 鹵1.2 Ma and 145 鹵2 Ma.The zircon U-Pb isotopic ages of granodiorite and fine-grained granodiorite are 144.9 鹵1.2 Ma and 145 鹵2 Ma.Gaojia X respectively. The magmatic rocks associated with the Baizhang deposit correspond to Qingyang-Jiujiu, respectively. The first stage of the Huashan complex and the 4th stage of the late stage, The main elements, trace elements, petrogenic minerals, electron probe analysis and so on show that the Qingyang-Jiuhuashan complex rock mass and the related igneous rocks of tungsten and molybdenum ore are both crust-mantle source. Probably from the same initial magma chamber, belonging to the high-potassium calc-alkaline series, quasialuminum-weak peraluminous. Electron probe analysis shows that the pyroxene in skarn of the Gaojia X] deposit is diopside-calcium ferroxene series, The pomegranate is a series of calcium aluminite and calcium iron garnet. The composition of the garnet is quite different from that of the Baizhang rock deposit. The results show that the pomegranate and pyroxene compositions in skarn tungsten molybdenum deposit are not specific. The characteristics of pomegranate ring belt and symbiotic pomegranate pyroxene mineral pair in the Gaojia X deposit indicate that the metallogenic environment is changed, and the ore-forming environment is changed after the magmatic fluid dissolves. The acidity of the system increased, the oxygen fugacity decreased, and gradually transitioned to a relatively reductive environment. By using the molybdenum Re-Os dating method, the metallogenic age of the Gaojia X] deposit was obtained to be 146.1 鹵4.8 Ma.The metallogenic age of the Gaojia X] deposit is 146.1 鹵4.8 Ma. combined with the available data, The tungsten and molybdenum deposits developed in Yanshanian period in southern Anhui were divided into two periods, 146-136Ma and 134-128Ma. the metallogenic geological conditions were discussed from stratigraphy, structure and the relationship between magmatic rocks and mineralization, respectively, and the metallogenic model of the deposit was established. This work enhances the understanding of the metallogenic regularity of Yanshanian tungsten and molybdenum deposits in southern Anhui, and has certain practical guiding significance for the follow-up exploration of tungsten and molybdenum polymetallic minerals in southern Anhui.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.6

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