【摘要】：巴爾魯克地區(qū)位于新疆西準(zhǔn)噶爾西緣,西鄰哈薩克斯坦巴爾喀什成礦帶,東接包古圖成礦區(qū)。本文在前人工作的基礎(chǔ)上,通過野外地質(zhì)考察、巖相學(xué)、地球化學(xué)、同位素示蹤和鋯石U-Pb年代學(xué)等研究,確定加曼鐵列克得、石屋礦化斑巖體的時空差異、巖石成因和構(gòu)造環(huán)境,并與鄰區(qū)進(jìn)行對比,探討其成礦意義。論文取得以下主要成果：1、通過鋯石LA-ICP-MS U-Pb定年獲得加曼鐵列克得巖體花崗閃長巖的結(jié)晶年齡為318.2±3.6Ma,石屋巖體花崗閃長斑巖、石英閃長巖的結(jié)晶年齡為322.1±1.5Ma、 322.4±1.5Ma,表明巴爾魯克礦化斑巖體侵位的時代為晚石炭世。與包古圖含礦斑巖體的形成時代相同,略晚于巴爾喀什地區(qū)含礦斑巖體。2、加曼鐵列克得巖體由花崗閃長巖組成,具有高Al_2O_3、低MgO,高Sr、低Y,虧損HREE,弱Eu異常的類埃達(dá)克巖地球化學(xué)特點(diǎn),屬于準(zhǔn)過鋁質(zhì)中鉀鈣堿性花崗巖。石屋巖體由花崗閃長斑巖和石英閃長巖組成�；◢忛W長斑巖高Al_2O_3、低MgO、高Sr、低Y,虧損HREE,弱Eu異常,屬于弱過鋁質(zhì)鈣堿性-低鉀拉斑系列過渡的花崗巖;石英閃長巖高Al_2O_3、富CaO、低MgO,高Sr、高Y,虧損HREE,弱Eu異常,屬于準(zhǔn)鋁質(zhì)鈣堿性-低鉀拉斑系列過渡的花崗巖類。3、加曼鐵列克得、石屋礦化斑巖體形成于晚石炭世俯沖背景下的島弧環(huán)境。它們具有相同的源區(qū),可能是達(dá)拉布特洋殼向北俯沖至地幔楔下部,俯沖洋殼板片和沉積物脫水產(chǎn)生的流體和熔體,在上升過程中與地幔楔共同作用形成的產(chǎn)物。4、巴爾魯克地區(qū)礦化斑巖體屬于同一構(gòu)造-巖漿-成礦帶,區(qū)內(nèi)斷裂構(gòu)造發(fā)育,巖體蝕變較強(qiáng)烈,表明區(qū)內(nèi)流體活動比較強(qiáng)烈,為斑巖型銅礦化提供了必要的構(gòu)造、巖漿、物源和流體條件。同時,其大地構(gòu)造環(huán)境、巖體特征、時空演化、源區(qū)特征等跟巴爾喀什、包古圖斑巖型礦床的含礦巖石相類似,表明區(qū)內(nèi)斑巖型礦床可能為巴爾喀什成礦帶的東延部分,暗示區(qū)內(nèi)斑巖型礦床找礦具有很大前景。晚石炭世中酸性斑巖體,可能是尋找斑巖型銅、鉬(金)的目標(biāo)地質(zhì)體。
[Abstract]:Baluk area is located in the western margin of Xinjiang, bordering the Balkesh metallogenic belt in Kazakhstan and Baogutu metallogenic area in the east. On the basis of previous work, through field geological investigation, petrography, geochemistry, isotopic tracer and zircon U-Pb chronology, the authors have determined the temporal and spatial differences of the Camantellede and Shiwu mineralized porphyry bodies. The petrogenesis and tectonic environment are compared with the adjacent areas to discuss its metallogenic significance. The main results are as follows: 1. The crystallization age of the granodiorite in the Kalmanterek rock body is 318.2 鹵3.6 Ma, and the granodiorite porphyry in Shiwu rock body is obtained by zircon LA-ICP-MS U-Pb dating. The age of crystallization of quartz diorite is 322.1 鹵1.5 Maand 322.4 鹵1.5Ma. it indicates that the emplacement age of Barluk mineralization porphyry is late Carboniferous. The ore-bearing porphyry body in Baogutu was formed in the same time as the porphyry body in Baogutu, and was slightly later than the porphyry rock body in the Balkashi area. 2. The Kamandelike rock body is composed of granodiorite, with high Al_2O_3, low MgO, high Sr, low Y, and depleted HREE,. The geochemical characteristics of the weak Eu anomaly are similar to those of the adake-like rocks and belong to the quasi-peraluminous medium potassium calc-alkaline granites. Shiwu rock body is composed of granodiorite porphyry and quartz diorite. Granodiorite porphyry is high Al_2O_3, low MgO, high Sr, low Y. depleted HREE, weak Eu anomaly belongs to weak peraluminous calc-alkaline-low potash transition granite; Quartz diorite is high in Al_2O_3, rich in CaO, low in MgO, high in Sr, high in Y. and depleted in HREE, weak Eu anomaly. Shiwu mineralization porphyry was formed in the island arc environment of late Carboniferous subduction. They share the same source, probably resulting from the northward subduction of the Dalabut oceanic crust to the lower mantle wedge, the subduction of fluids and melts from ocean crust plates and sediment dehydration, and the interaction between the mantle wedge and the mantle wedge during the rise. The mineralized porphyry in Balluk area belongs to the same tectonic-magmatic metallogenic belt, where the fault structure is developed and the alteration of the rock mass is strong, which indicates that the fluid activity in the area is relatively strong, which provides the necessary structure for porphyry type copper mineralization. Source and fluid conditions. At the same time, the geotectonic environment, rock mass characteristics, space-time evolution and source area characteristics are similar to the ore-bearing rocks of the Baykash and Baogutu porphyry deposits, indicating that the porphyry deposits in the area may be the eastward extension of the Balkashi metallogenic belt. It is suggested that porphyry deposit prospecting has great prospect in this area. The late Carboniferous intermediate-acid porphyry may be the target geological body for porphyry copper and molybdenum (gold).
【學(xué)位授予單位】：西北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：P612

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