本文選題：白水寨花崗巖 + 巖相學(xué)　； 參考：《東華理工大學(xué)》2015年碩士論文

【摘要】：白水寨花崗巖位于下莊礦田西北部,地表出露面積約2km2,處于多期次成礦熱液活動中心疊加部位。本文從巖相學(xué)、巖石地球化學(xué)等方面重點(diǎn)對白水寨花崗巖進(jìn)行系統(tǒng)研究,分析其構(gòu)造環(huán)境和成因,同時分析研究區(qū)控礦構(gòu)造特征、圍巖蝕變特征、圍巖蝕變與鈾成礦關(guān)系,探討白水寨花崗巖、巖石地球化學(xué)特征、鈾礦化及成礦作用。白水寨花崗巖具有高硅、高鉀、高鋁、富堿、低鐵鎂比值,具有S型強(qiáng)過鋁質(zhì)花崗巖特征;微量元素特征表現(xiàn)輕稀土富集、重稀土虧損特征;白水寨巖體的CaO/Na2O平均比值均大于0.3、TFeO+MgO+TiO2含量為2.09%~3.06%,都低于4%,反映其源巖以泥質(zhì)成分為主,在Rb-(Y+Nb)構(gòu)造環(huán)境判別圖解中白水寨花崗巖表現(xiàn)為后碰撞構(gòu)造屬性,說明白水寨巖體的形成可能是在地殼運(yùn)動過程中,通過古元古代變質(zhì)沉積巖低程度部分熔融形成,經(jīng)過印支后碰撞運(yùn)動使地殼縮短減薄侵位加上地幔上涌形成的花崗巖。白水寨花崗巖主要受北東向構(gòu)造、北東東-北東向及北西西-近東西向三組構(gòu)造控制其展布,以北東東-北東向和北西西-近東西向構(gòu)造控礦。巖體發(fā)育硅化、鉀長石化、堿交代、絹云母化、綠泥石化、赤鐵礦化、黃鐵礦化、螢石化等多種熱液蝕變;礦石礦物主要有瀝青鈾礦、鈾石、鈦鈾礦、釷石等原生鈾礦物和硅鈣鈾礦、鈣鈾云母、銅鈾云母等次生鈾礦物。研究區(qū)巖漿活動—斷裂構(gòu)造—鈾礦化組合分為三期:第一期富鈾熱液活動形成于晚期細(xì)�；◢弾r侵入之后,早階段為高溫富硅酸性熱液,礦化類型主要為鈾-微晶石英型;在此基礎(chǔ)上,第二期中溫富鈾堿性熱液形成堿交代巖,礦化類型主要為鈾-堿交代-赤鐵礦型和鈾-微晶石英-黃鐵礦型;第三期中低溫富硅、鈾酸性熱液活動形成于中基性巖漿,礦化類型主要為鈾-微晶石英型。與鈾成礦關(guān)系密切的綠泥石化以鐵綠泥石、鐵鎂綠泥石及密綠泥石為主,形成溫度介于172.81℃~228.49℃,平均為202.08℃;成礦過程中高溫?zé)嵋菏沟迷鞄r礦物云母、長石蝕變成綠泥石并活化鈾,在后期還原條件下新生蝕變礦物吸附鈾。白水寨花崗巖在巖漿演化過程中鈾向晚期形成巖體富集,鈾礦化發(fā)生于巖體接觸帶和巖體與斷裂構(gòu)造的結(jié)點(diǎn)處,其燕山早期花崗巖漿形成了鈾活化區(qū),燕山晚期第三階段高鈾、極低釷超酸性花崗巖漿侵入,形成研究區(qū)內(nèi)高鈾花崗巖;在蝕變斷裂內(nèi)水-巖作用催化之后,形成早期蝕變礦物,使巖石中惰性鈾釋放出來成為活性鈾;大氣降水浸取了活化鈾,富堿含揮發(fā)組分CO2和F的催化劑熱液流體上升產(chǎn)生復(fù)合作用,熱液中的活性鈾在還原環(huán)境下形成鈾礦物,并被新生成的蝕變礦物吸附;通過北東向斷裂帶聚集、傳導(dǎo)、運(yùn)輸、存儲,然后與近東西向復(fù)雜構(gòu)造帶和北東東向構(gòu)造帶及補(bǔ)體相交接,從而形成白水寨地區(qū)鈾礦床和鈾礦點(diǎn)。
[Abstract]:The Whitewater Village granite is located in the northwest of the lower Zhuang ore field. The surface area of the surface is about 2km2 and is located at the superposition of the multi-stage hydrothermal activity center. This paper systematically studies the white water village granite from petrography, rock geochemistry and other aspects, analyzes its tectonic environment and causes, and analyses the characteristics of ore control structure and the alteration of surrounding rock. Characteristics, the relationship between wall rock alteration and uranium mineralization, and discuss the Whitewater Village granite, rock geochemistry, uranium mineralization and mineralization. Whitewater Village granite has high silicon, high potassium, high aluminum, alkali rich, low iron and magnesium ratio, with the characteristics of S type strong peraluminous granite; trace element characteristics show light rare earth enrichment, heavy rare earth loss characteristics; Whitewater Village rock mass The average ratio of CaO/Na2O is more than 0.3, and the content of TFeO+MgO+TiO2 is 2.09%~3.06%, which is lower than 4%. It reflects that the source rock is mainly composed of argillaceous composition. In the Rb- (Y+Nb) tectonic setting diagram, the Whitewater Village granite is manifested as the post collision structural property. It is said that the formation of the rock mass may be in the process of crustal movement through Paleoproterozoic metamorphic deposition. The low-level partial melting of rock formed, after the collision movement of the Indo branch, the crust shortened the thinning emplacement and the granites formed by the upwelling of the mantle. The Whitewater Village granite is mainly North East structure, the north east east to the North East and the North West West East-West structure control its distribution, and the north east east to North East and West West West near East-West structure ore control. Silicification, potassium long fossilization, alkali metasomatism, sericite, green mud petrochemistry, hematite mineralization, pyrite mineralization, fluoro petrochemistry and other hydrothermal alteration, ore minerals are mainly primary uranium ore, uranium ore, uranium tiorite, thorium and other primary uranium minerals, calcium uranium mica, copper uranium mica and other secondary uranium minerals. The magmatic activity fracture structure in the study area - The uranium mineralization assemblage is divided into three stages: the first phase of uranium rich hydrothermal activity was formed after the invasion of late fine-grained granites. The early stage was high temperature silicon rich acid hydrothermal solution, and the mineralization type was mainly uranium microcrystalline quartz type. On this basis, the second phase medium temperature uranium rich alkaline hydrothermal solution formed alkali metasomatism, and the mineralization type was mainly uranium alkali metasomite type and uranium. Microcrystalline quartz and pyrite type; third stage low temperature silicon rich, uranium acid hydrothermal activity formed in medium base magma, mineralization type is mainly uranium microcrystalline quartz type. The green mudstone, which is closely related to uranium mineralization, mainly consists of iron chlorite, iron magnesia chlorite and millistone, and the formation temperature is 172.81 ~228.49 C, average 202.08 degrees C; Medium and high temperature hydrothermal fluids make rock formation mineral mica, feldspar alteration to chlorite and activate uranium, and activate uranium and adsorb uranium in the later reduction conditions. The Whitewater Village granite is enriched in the late stage of magma evolution, and uranium mineralization occurs at the contact zone of rock mass and the junction of rock mass and fracture structure, and its early granite in Yanshan The uranium activation area, high uranium in the late third stage of Yanshan, extremely low thorium super acid granite magma invaded and formed high uranium granite in the study area. After the alteration of internal water and rock catalysis, the early altered minerals were formed to release the inert uranium from the rock into active uranium, and the atmospheric precipitation soaked the activated uranium, and the alkali rich contained the volatile component CO2. The active uranium in the F catalyst has a compound effect. The active uranium in the hydrothermal solution forms uranium minerals in the reductive environment and is adsorbed by the newly formed altered minerals; it aggregates, conducts, transport, and stores through the north-east fault zone, and then connects with the near East-West complex tectonic zone and the North East to East tectonic belt and complement, thus forming the Whitewater Village. Area of uranium and uranium deposits.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.14;P588.121

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