本文選題：甲基卡 + 稀有金屬�。� 參考：《西南科技大學(xué)》2017年碩士論文

【摘要】：甲基卡偉晶巖型稀有金屬礦田中的礦床規(guī)模大、品位富、礦種多、埋藏淺、選礦性能好、地質(zhì)特征代表性強(qiáng),是全國(guó)稀有金屬礦的典型代表。稀有金屬偉晶巖脈侵位及形成過(guò)程中,在其圍巖中形成富有稀有元素的接觸變質(zhì)巖。因此,本論文在其中選取具有代表性的X03號(hào)脈(超大型鋰礦床)和NO528號(hào)脈(典型鈮鉭礦床),對(duì)其接觸變質(zhì)帶的分帶性、巖石學(xué)特征,以及銫等稀有元素的分布特征進(jìn)行詳細(xì)研究,并探討銫等稀有元素的賦存狀態(tài),為甲基卡稀有金屬礦田尋找銫礦提供一定的找礦方向,也為該地區(qū)偉晶巖礦床中提取銫礦物提供理論依據(jù)。獲得主要認(rèn)識(shí)有:(1)X03號(hào)和NO528號(hào)稀有金屬礦床的圍巖均遭受了近脈接觸變質(zhì),由內(nèi)到外形成了電氣石化和堇青石化。電氣石化帶內(nèi)形成了電氣石微晶片巖。電氣石多為黑色長(zhǎng)柱狀、針狀自形晶體。堇青石化帶形成了含堇青石的角巖、堇青石化十字石紅柱石二云母片巖,與電氣石化帶界線較清晰。交代作用主要為堇青石化、黑云母化、白云母(絹云母)化等。(2)X03號(hào)和NO528號(hào)稀有金屬礦床接觸變質(zhì)巖石中,均富集Cs、Li和Rb等稀有元素,且三者之間具有極顯著的正相關(guān)性。其中X03號(hào)的Cs元素含量平均值為486×10-6,Cs2O為0.008%~0.212%,平均值達(dá)0.052%,達(dá)到了伴生Cs2O綜合利用最低工業(yè)品位0.05%~0.06%;NO528號(hào)脈下方的少量樣品Cs元素達(dá)到了伴生銣銫綜合回收參考性工業(yè)指標(biāo),但Cs元素含量在總體上高于偉晶巖中的含量。(3)X03號(hào)和NO528號(hào)稀有金屬礦床接觸變質(zhì)巖石中,由接觸蝕變作用形成的新生云母(多硅白云母、鋰銣銫鐵葉云母、富鐵黑云母)中均富集Cs、Li和Rb等稀有元素,尤其Cs元素均值能達(dá)最低工業(yè)品位,其Cs平均含量分別為1970.5ppm、4406ppm和882.29ppm。另外X03號(hào)接觸變質(zhì)帶中電氣石中賦存有少量的Li元素;堇青石、鈦鐵礦和金紅石均賦存有少量的Cs元素;NO528號(hào)接觸變質(zhì)帶中紅柱石受退變質(zhì)作用形成的白云母中賦存有少量的Li、Rb和Cs元素。(4)接觸變質(zhì)帶中Li、Rb和Cs稀有元素主要是由Rb和Cs元素置換云母中兩個(gè)復(fù)式硅氧層之間較弱的聯(lián)結(jié)點(diǎn)K元素,Li、Mn和Fe等元素則是置換鋁氧八面體中的Al元素,與被置換剩余的元素以類質(zhì)同象的形式賦存于由接觸蝕變作用形成的新生云母中。
[Abstract]:The methyl card pegmatite type rare metal ore field has large scale, rich grade, many species, shallow buried, good mineral processing property and strong geological characteristics. It is a typical representative of rare metal ore in the country. In the process of vein emplacement and formation of rare metal pegmatite, it forms a contact metamorphic rock rich in rare elements in its surrounding rock. Therefore, this paper is in this paper The representative X03 vein (super large lithium deposit) and NO528 vein (typical niobium and tantalum deposit) are studied in detail, and the distribution characteristics of rare elements such as cesium and other rare elements are studied in detail, and the occurrence state of the rare elements such as cesium is discussed, which provides a certain amount of cesium mine in the methyl card rare metal field. The prospecting direction also provides a theoretical basis for the extraction of cesium minerals from the pegmatite deposits in this area. The main understanding is: (1) the surrounding rocks of the rare metal deposits of X03 and NO528 are all subjected to the contact metamorphism of the near vein, and the electropetrochemistry and cordierite are formed from the inner to the outer. The tourmaline microcrystalline schist is formed in the electric Petrochemical belt. The tourmaline is mostly black. The cordierite belt forms the kerite with cordierite, the two mica schist of cordierite cross Shi Hong column, and the clear boundary between the electric and petrochemical zone. The metasomatism is mainly cordierite, black mica and Bai Yunmu (sericite). (2) the X03 and NO528 rare metal deposits are in contact with the metamorphic rocks and are rich in the metamorphic rocks. The rare elements such as Cs, Li and Rb have a very significant positive correlation. The average value of the Cs element content of X03 is 486 x 10-6, Cs2O is 0.008%~0.212%, the average value reaches 0.052%, and the associated Cs2O uses the lowest industrial grade 0.05%~0.06%, and a small amount of sample Cs of the lower NO528 of the NO528 horn reaches the associated rubidium and cesium comprehensive return. In general, the content of Cs elements is higher than that in pegmatite. (3) in the metamorphic rocks of X03 and NO528 rare metal deposits, the new mica (polysilicon muscovite, lithium-ion, rubidium, cesium, iron leaf mica, rich iron black mica) formed by contact alteration is enriched in the rare elements such as Cs, Li and Rb, especially the mean value of Cs elements. The average Cs content of the industrial grade is 1970.5ppm, and the 4406ppm and 882.29ppm. other X03 contact metamorphic zones contain a small amount of Li elements; cordierite, ilmenite and Jin Hongshi all contain a small amount of Cs elements; the red column stone in the NO528 contact metamorphic belt is less than the degenerated muscovite. The amount of Li, Rb and Cs elements. (4) the rare elements of Li, Rb and Cs in the contact metamorphic zone are mainly composed of the Rb and Cs elements replacing the weak junctions between the two compound layers of the mica of the mica, and the Li, Mn, and Fe are the elements in the replacement of the aluminum oxide eight in the form of the remainder of the remaining elements in the form of the resembling substance in the form of contact alteration. In the formation of the newborn mica.

【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.6

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