本文選題：查干德爾斯 + 鉬礦床　； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：查干德爾斯鉬礦床是近幾年新發(fā)現(xiàn)的一個(gè)大型的隱伏礦床,其位于內(nèi)蒙古西部,中蒙邊界地區(qū)。礦區(qū)內(nèi)花崗巖極其發(fā)育,主要包括淺肉紅色的正長花崗巖以及中細(xì)粒二長花崗巖。花崗巖體內(nèi)部有無數(shù)石英脈穿插,而鉬礦化與其關(guān)系十分的緊密。含鉬礦石礦化主要以細(xì)脈浸染狀以及團(tuán)塊狀為主。文中較為系統(tǒng)地研究了輝鉬礦的巖石化學(xué)特征以及微量、稀土元素的特征,并分析了礦石成因以及構(gòu)造環(huán)境等方面的特征。分析表明二長花崗巖和鉀長花崗巖具有相同的源區(qū)、構(gòu)造背景以及形成演化過程,其源區(qū)是受到早期陸緣弧俯沖作用改造及地殼混染的巖石,再經(jīng)過部分熔融作用所形成。通過輝鉬礦錸-鋨同位素年齡測定,得出輝鉬礦的成礦時(shí)間距今243Ma左右,歷時(shí)大約10Ma。根據(jù)相關(guān)資料顯示,該礦體的輝鉬礦的成礦時(shí)代非常接近早三疊世正長花崗巖的成巖時(shí)代,正長花崗巖形成于印支期早期,從而可以判斷出查干德爾斯礦區(qū)鉬礦也形成于為印支期早期。礦區(qū)內(nèi)大部分鉬礦受到石英脈的控制,因此鉬礦的形成與NW向的石英脈之間密切相關(guān)。綜上所述,查干德爾斯鉬礦的成礦物質(zhì)來源主要是在早三疊世后碰撞作用過程中由地幔巖漿與地殼重熔巖漿經(jīng)過結(jié)晶分異作用形成的。由于該礦區(qū)的構(gòu)造運(yùn)動活躍,礦區(qū)內(nèi)裂隙發(fā)育較好,隨著成礦后期富含成礦元素的巖漿熱液由地幔相地殼運(yùn)移,并充填在這些石英脈中,由此逐漸形成鉬礦床。
[Abstract]:Chagandels molybdenum deposit is a large concealed deposit discovered in recent years. It is located in the western part of Inner Mongolia and the border area between China and Mongolia. The granites in the mining area are extremely developed, mainly including reddish syenite and medium-fine-grained monzomorphic granites. There are numerous quartz veins interspersed in the granite body, and molybdenum mineralization is closely related to it. The mineralization of molybdenum-bearing ore is mainly vein-disseminated and lump-shaped. In this paper, the petrochemical characteristics, trace and rare earth elements of molybdenum ore are systematically studied, and the characteristics of ore genesis and tectonic environment are analyzed. The analysis shows that the bifeldite and the potash feldspar have the same source region, tectonic setting and evolution process. The source area is the rock transformed by early continental margin arc subduction and crustal mixing, and then formed by partial melting. Based on the determination of rhenium and osmium isotopic age of molybdenum ore, the metallogenic time of molybdenum ore is about 243Ma, which lasts about 10 Ma. According to the relevant data, the metallogenic age of the molybdenum deposit is very close to that of the early Triassic syenite, and the syenite formed in the early Indosinian period. It can be concluded that the molybdenum deposit of Chagandels deposit was also formed in the early Indosinian period. Most molybdenum deposits are controlled by quartz veins, so the formation of molybdenum ore is closely related to the NW direction quartz veins. To sum up, the source of metallogenic material of Chagandels molybdenum deposit is mainly formed by the crystallization differentiation between mantle magma and crustal remelting magma during the early Triassic collision. Because of the active tectonic movement in the ore area, the cracks in the ore area are well developed. With the magmatic hydrothermal fluid rich in ore-forming elements migrating from the mantle facies crust and filling in these quartz veins, molybdenum deposits are gradually formed during the late metallogenic period.
【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】：2015
【分類號】：P618.65;P597

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