甲基卡稀有金属矿田伟晶岩接触变质带铯元素分布特征及赋存状态

发布时间：2018-05-04 18:22

本文选题：甲基卡 + 稀有金属　；参考：《西南科技大学》2017年硕士论文

【摘要】：甲基卡伟晶岩型稀有金属矿田中的矿床规模大、品位富、矿种多、埋藏浅、选矿性能好、地质特征代表性强,是全国稀有金属矿的典型代表。稀有金属伟晶岩脉侵位及形成过程中,在其围岩中形成富有稀有元素的接触变质岩。因此,本论文在其中选取具有代表性的X03号脉(超大型锂矿床)和NO528号脉(典型铌钽矿床),对其接触变质带的分带性、岩石学特征,以及铯等稀有元素的分布特征进行详细研究,并探讨铯等稀有元素的赋存状态,为甲基卡稀有金属矿田寻找铯矿提供一定的找矿方向,也为该地区伟晶岩矿床中提取铯矿物提供理论依据。获得主要认识有:(1)X03号和NO528号稀有金属矿床的围岩均遭受了近脉接触变质,由内到外形成了电气石化和堇青石化。电气石化带内形成了电气石微晶片岩。电气石多为黑色长柱状、针状自形晶体。堇青石化带形成了含堇青石的角岩、堇青石化十字石红柱石二云母片岩,与电气石化带界线较清晰。交代作用主要为堇青石化、黑云母化、白云母(绢云母)化等。(2)X03号和NO528号稀有金属矿床接触变质岩石中,均富集Cs、Li和Rb等稀有元素,且三者之间具有极显著的正相关性。其中X03号的Cs元素含量平均值为486×10-6,Cs2O为0.008%~0.212%,平均值达0.052%,达到了伴生Cs2O综合利用最低工业品位0.05%~0.06%;NO528号脉下方的少量样品Cs元素达到了伴生铷铯综合回收参考性工业指标,但Cs元素含量在总体上高于伟晶岩中的含量。(3)X03号和NO528号稀有金属矿床接触变质岩石中,由接触蚀变作用形成的新生云母(多硅白云母、锂铷铯铁叶云母、富铁黑云母)中均富集Cs、Li和Rb等稀有元素,尤其Cs元素均值能达最低工业品位,其Cs平均含量分别为1970.5ppm、4406ppm和882.29ppm。另外X03号接触变质带中电气石中赋存有少量的Li元素;堇青石、钛铁矿和金红石均赋存有少量的Cs元素;NO528号接触变质带中红柱石受退变质作用形成的白云母中赋存有少量的Li、Rb和Cs元素。(4)接触变质带中Li、Rb和Cs稀有元素主要是由Rb和Cs元素置换云母中两个复式硅氧层之间较弱的联结点K元素,Li、Mn和Fe等元素则是置换铝氧八面体中的Al元素,与被置换剩余的元素以类质同象的形式赋存于由接触蚀变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.

【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.6

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