本文選題：贛西北　切入點(diǎn)：花山洞鎢礦　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來,江西省北部九嶺地區(qū)相繼發(fā)現(xiàn)了多個(gè)中大型鎢錫多金屬礦床,成為了重要的資源潛力區(qū),花山洞礦區(qū)即為其中之一。本文研究分析了與贛西北花山洞鎢礦有密切成因關(guān)系的花崗巖及礦區(qū)附近山口巖體的地球化學(xué)特征。巖石地球化學(xué)表明,巖石地球化學(xué)表明,這三種巖石均為鈣堿性過鋁質(zhì),富Na的花崗巖;且從山口巖體到黑云母花崗巖再到含白云母花崗巖,總體上Si O2含量增高,堿質(zhì)增加,鋁含量降低,鐵鎂含量降低,為正巖漿演化趨勢(shì)。微量元素中,三種巖石均富集Rb、Tu、U、La、Nd等大離子親石元素,虧損Ba、Nb、Ti、Sr、P等元素,具有大陸地殼的特征。含白云母花崗巖、黑云母花崗巖和山口巖體的Rb/Sr值分別為:0.98、1、0.63;Rb/Nb分別為20.8、22.9、17;顯著高于中國(guó)東部上地殼的平均值和全球分平均值,Nb/Ta平均值分別為9.34、9.81、10.4,低于地殼平均值,暗示花崗質(zhì)巖漿具有殼源特征。在成礦元素方面,含白云母花崗巖W、Sn平均含量顯著高于黑云母花崗巖和山口巖體,說明含白云母花崗巖與成礦關(guān)系更為密切。三者總稀土含量均較低,且從含白云母花崗巖到黑云母花崗巖再到山口巖體稀土總量逐漸增加基本無δCe異常。在稀土配分型式圖中可見稀土配分型式總體向右傾斜,為典型的‘I’型花崗巖特征。輕稀土分異較為明顯;重稀土分異不明顯。含白云母母花崗巖、黑云母花崗巖和山口巖體主量元素間存在過渡及正巖漿演化的趨勢(shì);微量元素比值蛛網(wǎng)圖和稀土元素配分型式圖頗為一致;形成時(shí)代接近;空間上緊鄰;三者可能為同源分異巖漿。含白云母花崗巖其LA-MICP-MS鋯石U-Pb測(cè)年結(jié)果為807.1±8.2Ma,與前人測(cè)得的與白鎢礦共生的輝鉬礦Re-Os年齡極為接近,故該期花崗巖為成礦巖體。結(jié)合有關(guān)區(qū)域背景資料和前人研究成果可知,與花山洞鎢礦有關(guān)的花崗巖形成于新元古代,源區(qū)物質(zhì)除中元古代地殼物質(zhì)以外,有一定新生地幔物質(zhì)的加入,其形成的構(gòu)造背景為島弧碰撞后拉張環(huán)境。此次分析表明該礦床成礦作用與晉寧期巖漿作用有關(guān),該發(fā)現(xiàn)不僅為贛北甚至整個(gè)華南地區(qū)鎢礦的研究提供新的思路和方向,而且對(duì)華南鎢礦多期次成礦作用研究及找礦實(shí)踐具有重要指導(dǎo)意義。
[Abstract]:In recent years, Jiangxi Province North Ridge nine have been found in a number of large tungsten tin polymetallic deposit, become the important area of resource potential, Huashan hole mining is one of them. This paper analyzes the geochemical characteristics of granite mining area and has a close genetic relationship with the North cave near the mountain flower tungsten rock mass. Rock geochemistry shows that rock geochemistry shows that the three types of rocks are peraluminous calc alkaline, Na rich granite; and from the mountain rock to biotite granite to contain muscovite granite, increased the overall Si O2 content, alkali increase, decreasing the content of aluminum, iron and magnesium content is reduced, magma evolution trend of trace elements in three kinds of rocks are enriched in Rb, Tu, U, La, Nd and other large ion lithophile elements, Nb, Ti, loss of Ba, Sr, P and other elements, has the characteristics of continental crust. Containing muscovite granite, biotite granite and rock mountain The Rb/Sr values were: 0.98,1,0.63; Rb/Nb 20.8,22.9,17 respectively; significantly higher than the average China in the upper crust is the average and the world, the average value of Nb/Ta was 9.34,9.81,10.4, lower than the average value of the crust, suggesting that the granitic magma with crust. The metallogenic elements, including muscovite granite W, average Sn content significantly above the biotite granite and mountain rock, containing muscovite granite and mineralization more closely. Total content of rare earth three was low, and from muscovite granite to biotite granite to the mountain rock rare earth volume gradually increased. In the delta Ce no abnormal REE patterns seen with rare earth the overall model is skewed to the right, is a typical "I" type granites. LREE differentiation is obvious; hree is not obvious. With Muscovite parent granite, biotite granite and rock mountain There is transition and magma evolution trend of major elements; the spider diagram of trace element ratio and the REE distribution patterns is quite consistent; the formation age of near space; close to three were homologous; differentiation of muscovite granite magma. Containing the LA-MICP-MS zircon U-Pb dating results with the previous 807.1 + 8.2Ma. The measured and the Re-Os ages of Molybdenite scheelite symbiosis is very close to the granite ore rock. Combined with the regional background data and the previous research results, related to flower cave tungsten granite formed in Neoproterozoic, source materials except the Mesoproterozoic crustal material, has added new material in the mantle. The tectonic background for the formation of the arc after the collision extensional environment. The analysis shows that the mineralization and magma of Jinning period, which not only in North Southern China and even the whole area of tungsten The study of ore deposits provides new ideas and directions, and has important guiding significance for the study of the multiphase metallogenesis of Southern China tungsten ore and the practice of prospecting.

【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.67;P597.3

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本文編號(hào)：1648613