【摘要】：燒綠石超族礦物由于出現(xiàn)不同程度的非晶質(zhì)化現(xiàn)象,給該類礦物的鑒定和命名帶來了困難;另一方面,水也是燒綠石超族礦物的重要成分之一,水的含量和結(jié)構(gòu)形式對(duì)其定名起到關(guān)鍵作用。因此對(duì)燒綠石超族礦物進(jìn)行非晶質(zhì)的成因及晶化過程研究以及水的結(jié)構(gòu)形式研究有重要的意義。燒綠石超族礦物非晶質(zhì)化產(chǎn)生的原因主要與這些礦物中含有較高放射性元素(U、Th、TR等)導(dǎo)致的輻射損傷有關(guān),其燒綠石超族礦物結(jié)構(gòu)特殊性和類質(zhì)同像取代的復(fù)雜性使其出現(xiàn)空位導(dǎo)致的晶格不穩(wěn)定性也可能是造成礦物非晶質(zhì)化的原因之一。為了解決礦物的非晶質(zhì)化特性在衍射研究中的困難,本次結(jié)合鏡下挑選、掃描電鏡、電子探針及顯微硬度測(cè)試等實(shí)驗(yàn),對(duì)三種典型的非晶質(zhì)燒綠石超族礦物進(jìn)行了加熱實(shí)驗(yàn)研究。通過控制速率來改變加熱時(shí)長和降溫梯度,實(shí)驗(yàn)結(jié)果表明加熱時(shí)長和溫度梯度的變化對(duì)非晶質(zhì)礦物重結(jié)晶有重要的影響。對(duì)最終加熱的樣品進(jìn)行的X射線衍射研究顯示,熱處理使礦物的晶體結(jié)構(gòu)得到了不同程度的恢復(fù),這對(duì)該類礦物的化學(xué)試計(jì)算和定名提供了資料。四川冕寧縣牦牛坪礦床中發(fā)現(xiàn)的燒綠石族礦物,經(jīng)電子探針鑒定其為富鉛且含水的燒綠石,但水的類型的確定一直是個(gè)難題,本文采用紅外光譜和差熱分析,通過一系列加熱實(shí)驗(yàn)研究,較好的解決了該含水的鉛燒綠石礦物中水的類型,實(shí)驗(yàn)證實(shí)該礦中的水為結(jié)晶水,因此定名為水鉛燒綠石。
[Abstract]:It is difficult to identify and name this kind of mineral because of the phenomenon of amorphous in different degree. On the other hand, water is also one of the important components of the minerals of burning green Shi Chao group. The content and structure of water play a key role in naming it. Therefore, it is of great significance to study the formation and crystallization process of amorphous and the structure of water. The cause of amorphous formation of burned green Shi Chao group minerals is mainly related to the radiation damage caused by the higher radioactive elements (Uth TR, etc.) in these minerals. The structural particularity of its burning green Shi Chao group and the complexity of the substitution of the same image make it possible that the lattice instability caused by the vacancy is also one of the reasons for the amorphous mineral. In order to solve the problem of the amorphous properties of minerals in the study of diffraction, the experiments such as scanning electron microscope, electron probe and microhardness testing were carried out under the microscope. Three typical amorphous burned green Shi Chao group minerals were studied by heating experiments. The experimental results show that the change of heating length and temperature gradient has an important effect on recrystallization of amorphous minerals. The X-ray diffraction study of the final heated samples shows that the crystal structure of the minerals is restored to varying degrees by heat treatment, which provides data for the chemical trial calculation and designation of the minerals. The pyrochlore group minerals found in Yangniuping deposit, Mianning County, Sichuan Province, were identified by electron probe as lead-rich and water-rich pyrochlore, but the determination of water type has always been a difficult problem. In this paper, infrared spectroscopy and differential thermal analysis are used. Through a series of heating experiments, the type of water in the water-bearing lead pyrochlore mineral is well solved. The experiment proves that the water in the ore is crystalline water, so it is called water lead pyrochlore.
【學(xué)位授予單位】：中國地質(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)】：P578.492

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本文編號(hào)：2287614