本文選題：響洪甸堿性雜巖體 + 鉬礦��； 參考：《合肥工業(yè)大學(xué)》2015年碩士論文

【摘要】：隨著金寨沙坪溝超大型鉬礦床的發(fā)現(xiàn),北淮陽構(gòu)造帶東段中生代中酸巖漿巖與成礦作用的關(guān)系已成為地質(zhì)找礦工作重點。本文依托安徽省公益性地質(zhì)工作項目“六安市西峰寺地區(qū)鋁多金屬礦成礦條件調(diào)查”(2013-g-11),通過對響洪甸堿性雜巖體的巖石化學(xué)、稀土和微量元素分析測試、堿性侵入巖的LA-ICPMS鋯石U-Pb測年、輝鉬礦Re-Os同位素測年以及綜合分析整理,著重研究響洪甸堿性侵入巖和火山巖的巖石學(xué)特征、方家洼鋁礦床的地質(zhì)特征及成因探討,總結(jié)成礦規(guī)律,為本區(qū)找礦提供科學(xué)理論基礎(chǔ)。響洪甸火山巖以假白榴石響巖、粗面質(zhì)凝灰熔巖和粗面質(zhì)一假白榴石響巖質(zhì)火山角礫巖為主。堿性侵入巖巖石組合為正長巖、堿性正長巖和霞石正長巖,成巖時代劃分為3個期次：早期霞石正長巖的年齡為130-136Ma,中期為正長巖和正長斑巖,成巖年齡為125-130 Ma,晚期為堿性正長巖年齡為122-125 Ma。堿性侵入巖和火山巖具有相似的地球化學(xué)特征,總體為富堿、高鉀、貧鈦的堿性-過堿性巖石,均具有富集大離子親石元素K、Rb、U、Sr、Nd、相對虧損高場強(qiáng)元素Nb、Ta、P、Ti,較高的稀土元素的總量,富集輕重稀土元素等特點,顯示本區(qū)巖漿演化程度為中等,二者巖漿巖源區(qū)物質(zhì)組成相似、有同源的演化特征。方家洼鉬礦床成礦年齡為123.6Ma,屬大別山鉬成礦帶晚燕山成礦期。成礦物質(zhì)來源于正長斑巖,成礦流體具低溫低鹽的特征,礦床成因?qū)侔邘r型鉬礦床大類。NWW向斷裂與NE向斷裂交匯部位為熱液運移提供了良好的通道和容礦空間,后期正長斑巖與成礦關(guān)系密切。
[Abstract]:With the discovery of the super large molybdenum deposit in the Jinzhai Sha Ping gully, the relationship between Mesozoic middle acid magmatic rocks and mineralization in the eastern part of the northern Huaiyang tectonic belt has become the focus of geological prospecting. This paper relies on the "investigation of the metallogenic conditions of the aluminum polymetallic ore in the Xifeng Temple area of Lu'an" (2013-g-11), through the public welfare geological project of Anhui Province, through the randine base The petrochemistry of the sexual complex, the analysis and test of rare earth and trace elements, the LA-ICPMS zircon U-Pb dating of the alkaline intrusive rocks, the Re-Os isotope dating of molybdenite and the comprehensive analysis and arrangement, mainly study the petrological characteristics of the alkaline intrusive and volcanic rocks of the Xiang Hong Dian, the geological characteristics and genesis of the Fangjia DIWA al deposit, and the metallogenic regularity. It provides a scientific basis for ore prospecting in this area. The volcanic rocks of Xiang Hong Dian are mainly composed of false white granite, coarse and coarse, and coarse, and white garite ringing volcanic breccia. The alkaline intrusive rock is composed of syenite, alkaline syenite and nepheline syenite, and the age of diagenesis is divided into 3 stages: the age of early nepheline syenite is 13 0-136Ma, in the middle period, is diorite and normal porphyry, the age of diagenesis is 125-130 Ma, and the later period of alkaline syenite is 122-125 Ma. alkaline intrusive rock and volcanic rock with similar geochemical characteristics. The whole is alkali rich, high potassium and alkaline alkaline rock of poor titanium. All of them have rich ion stone elements, K, Rb, U, Sr, Nd, and relatively high field strength. The elements Nb, Ta, P, Ti, the total amount of rare earth elements, and the enrichment of the light and heavy rare earth elements, show that the magma evolution in this area is medium, and the two magmatic source areas are similar in material composition and have the same homologous evolution characteristics. The metallogenic age of the Fangjia Mo deposit is 123.6Ma, which belongs to the late Yanshan metallogenic period of the Dabieshan molybdenum metallogenic belt. The source of the metallogenic material is Yu Zheng long. Porphyry and ore-forming fluids are characterized by low temperature and low salinity. The genesis of the ore deposit is a good channel and ore bearing space for the hydrothermal migration of the large.NWW trending fault and NE fault zone of the porphyry molybdenum deposit, and the later syenite porphyry is closely related to the mineralization.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P612

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