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  本文選題：矽卡巖Fe-Cu + 巖石地球化學(xué)��； 參考：《中國地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：加多捕勒矽卡巖鐵銅礦床位于西藏謝通門縣春哲鄉(xiāng)以北約8km,處于拉薩地體中部隆格爾-工布江達弧背斷隆帶南緣。礦床研究程度較低,僅有侵入巖成巖時代和巖石成因的報到,黑云母二長花崗巖與成礦關(guān)系比較密切,但其與成礦相關(guān)研究較弱。本文主要在詳細礦床地質(zhì)特征研究的基礎(chǔ)上,厘定了成礦巖體,并對其展開詳細的巖石地球化學(xué)和年代學(xué)研究,確定成礦巖體時代,探討成巖成礦背景和巖石成因。加多捕勒矽卡巖鐵銅礦床礦石礦物主要以磁鐵礦、黃銅礦和斑銅礦為主,次為赤鐵礦,其中鐵礦主要位于礦區(qū)南部、鐵礦和銅礦位于中部,而銅礦則位于礦區(qū)北部。脈石礦物主要為石榴石(包括鈣鐵榴石、鈣鋁榴石)、輝石(包括透輝石、鈣鐵輝石)、陽起石、綠簾石、綠泥石、金云母、石英和方解石。從礦區(qū)南部往北部石榴石的顏色由深變淺,成分從鈣鋁榴石逐漸減少鈣鐵榴石逐漸增多過渡。這些特征顯示與成礦相關(guān)的侵入體為礦區(qū)南部的黑云母二長花崗而不是北部出露的石英二長巖。鋯石U-Pb年代學(xué)研究表明黑云母二長花崗巖為53.82±0.60Ma,表明加多捕勒矽卡巖鐵銅礦床形成于始新世。加多捕勒黑云母二長花崗巖具有高K鈣堿性,鋁飽和度A/CNK小于1.1,中等的負Eu異常,顯示I型花崗巖特點。其富集Rb、Th等大離子親石元素,明顯虧損Ta、Nb、P、Ti等高場強元素,顯示弧巖漿特征。全巖的Fe2O3/(FeO+Fe2O3)平均值高達0.42,指示巖漿應(yīng)具有較高氧逸度。鋯石Hf同位素以及全巖Pb同位素研究表明成礦巖體為幔源巖漿與古老拉薩基底的熔體二元混合的產(chǎn)物。結(jié)合區(qū)域構(gòu)造背景,認為加多捕勒矽卡巖鐵銅礦床形成于始新世,在印度-亞洲大陸碰撞造山的主碰撞期,新特提斯洋板片回卷,引發(fā)了軟流圈地幔部分熔融,并與古老的下地殼熔體混合,該殼�；煸磶r漿經(jīng)巖漿房結(jié)晶分異后上侵而形成了黑云母二長花崗巖及相關(guān)的夕卡巖型礦化。
[Abstract]:The polysharam skarn iron and copper deposit is located in the southern margin of the Tibet Shigong gate County, Tibet, in the southern margin of the middle of the Lhasa earth body of the middle of the upland - kimu Kung Bu Jiang Da arc back uplift zone. The deposit is relatively low, only the intrusive rock age and Petrogenesis are reported, and the biotite two granites are closely related to the mineralization, but they are related to the mineralization. On the basis of the study of the geological features of the deposit, the ore-forming rock mass is determined, and the detailed geochemical and chronological studies are carried out to determine the age of the ore-forming rock mass, and the metallogenic background and petrogenesis of the diagenesis are discussed. The ore minerals of the plutarate skarn iron and copper deposits are mainly magnetite, chalcopyrite and speckles. The main copper mine is hematite, which is mainly located in the south of the mining area, iron ore and copper in the middle of the mine, and the copper mine is in the northern part of the mining area. The gangue minerals are mainly garnet (including calcite, calcite), pyroxene (including diopside, calcium Tie Huishi), Yang calcite, epidote, chlorite, gold mica, quartz and calcite. The color of the northern Garnet from the north to the north is shallower, and the composition of the calcium and aluminous garnet gradually decreases. These features show that the intrusive body associated with the mineralization is the two long black mica in the southern part of the mining area and not the northern quartz two long rock. The zircon U-Pb chronology study shows that the black mica two granites are 53.82 + 0.6. 0Ma shows that the calabarite skarn iron copper deposit was formed in Eocene. The Kabu black mica two feldspar has high K Calc alkalinity, A/CNK less than 1.1 of Al saturation, medium negative Eu anomaly and I type granite. It enriching Rb, Th and other large ionic stone elements, obviously losing Ta, Nb, P, Ti and so on, showing arc magma characteristics. The average value of Fe2O3/ (FeO+Fe2O3) is as high as 0.42, indicating that the magma should have high oxygen fugacity. The Hf isotopes of zircon and all rock Pb isotopes indicate that the ore-forming rock mass is a product of two yuan mixture of mantle derived magma and the melt of the old Lhasa basement. The main collision period of the India Asian continent collision orogenic orogeny, the new Tethys plate rewinding, caused the partial melting of the asthenosphere mantle, and mixed with the ancient lower crust melts. The crust and mantle mixed magma formed the black mica two feldspar granite and the phase of the skarn mineralization after the magma crystallization differentiation.

【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】：P618.41;P618.31

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