本文選題：磯頭巖體 + 巖石學(xué)和地球化學(xué)�。� 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：新橋銅硫鐵多金屬礦床是安徽銅陵礦集區(qū)內(nèi)一個典型的矽卡巖型礦床,其成因與礦區(qū)內(nèi)的磯頭巖體密切相關(guān)。本文在前人研究基礎(chǔ)上,對新橋礦區(qū)進行了綜合野外調(diào)查,并針對磯頭侵入巖進行了詳細的巖相學(xué)觀察以及年代學(xué)、礦物學(xué)和地球化學(xué)分析,重點討論了新橋礦區(qū)中生代巖漿作用及其成礦意義。野外調(diào)研結(jié)果證實,磯頭巖體是一個復(fù)式巖株,主要由石英閃長巖和閃長玢巖組成,其中�？梢砸姷介W長質(zhì)至輝長閃長質(zhì)和富云母包體。LA-ICP-MS鋯石U-Pb測年結(jié)果表明,磯頭石英閃長巖和閃長玢巖分別形成于(141.6±1.1)Ma和(129.9±0.6)Ma,屬于早白堊世兩期巖漿活動的產(chǎn)物。鏡下可見主巖與包體中的大量斑晶具有不平衡結(jié)構(gòu),包括不規(guī)則環(huán)帶和圓化邊以及篩狀和嵌晶結(jié)構(gòu)等。磯頭侵入巖屬于準鋁質(zhì)的高鉀鈣堿性巖石系列,微量元素和稀土元素地球化學(xué)以及礦物學(xué)分析資料結(jié)合巖相學(xué)觀察結(jié)果表明,磯頭侵入巖屬于殼�；煸磶r漿巖,在其形成過程中經(jīng)歷了結(jié)晶分異、同化混染和巖漿混合作用。綜合本區(qū)地質(zhì)地球化學(xué)資料,認為在巖石圈伸展減薄背景下,演化的高溫輝長閃長質(zhì)巖漿上侵至13~15 km,在中地殼發(fā)生分異結(jié)晶、同化混染和巖漿混合作用,形成石英閃長質(zhì)和閃長質(zhì)巖漿。后在構(gòu)造擾動與巖漿脈動下,石英閃長質(zhì)和閃長質(zhì)巖漿分兩期沿構(gòu)造薄弱面上侵至7~8 km,經(jīng)冷卻結(jié)晶形成磯頭巖體。在巖漿演化后期,巖漿熱液活動帶來的大量成礦物質(zhì)通過接觸交代和層間熱液交代作用在合適的地方不斷聚集形成了新橋銅硫鐵礦床。
[Abstract]:Xinqiao copper-sulphur iron polymetallic deposit is a typical skarn type deposit in Tongling ore concentration area of Anhui province. Its genesis is closely related to the Jitou rock body in the ore area. On the basis of previous studies, a comprehensive field survey was carried out in Xinqiao mining area, and detailed petrographic observation, geochronology, mineralogy and geochemical analysis of the intrusive rocks in Jitou were carried out. The Mesozoic magmatism and its metallogenic significance in Xinqiao mining area are discussed. The results of field investigation show that the Jitou rock body is a complex rock plant, mainly composed of quartz diorite and diorite porphyrite. Among them, the U-Pb dating results of diorite to pyroxenite and mica rich xenoliths. LA-ICP-MS zircon dating show that the rock mass is mainly composed of quartz diorite and diorite porphyrite. Jitou quartz diorite and diorite-porphyrite were formed in 141.6 鹵1.1)Ma and 129.9 鹵0.6Ma. they belong to the early Cretaceous magmatism. It can be seen that a large number of porphyry crystals in the main rock and inclusions have unbalanced structures under the microscope, including irregular ring zones and rounded edges, sieve and embedded structures, and so on. The geochemistry of trace elements and rare earth elements and mineralogical analysis data combined with petrographic observation indicate that the intrusive rocks belong to crust-mantle magmatic rocks. In the process of its formation, it has undergone crystallization differentiation, assimilation and magma mixing. Based on the geological and geochemical data of this area, it is considered that under the background of extensional thinning of lithosphere, the evolution of high-temperature pyroclase diorite magma transgression to 1315km, resulting in differential crystallization, assimilation and magma mixing in the middle crust. Forming quartz diorite and diorite magma. After the tectonic disturbance and magmatic pulsation, quartz diorite and diorite magma intruded up to 78 km along the weak surface of the structure in two stages, and formed the Qitou rock body by cooling and crystallization. In the late stage of magmatic evolution, a large number of ore-forming materials resulted from magmatic hydrothermal activity accumulated in a suitable place through contact metasomatism and interlayer hydrothermal metasomatism to form Xinqiao copper pyrite deposit.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.2;P588.11

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