發(fā)布時(shí)間：2018-01-28 21:38

  本文關(guān)鍵詞： 密玉 石英巖玉 寶石學(xué)特征 結(jié)構(gòu)成因 致色機(jī)理　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：密玉為石英質(zhì)玉石,產(chǎn)于河南省密縣,現(xiàn)新密市,質(zhì)地細(xì)膩,有紅、黃、紫、黑等多種顏色,而綠色鮮艷,更有“河南翠”之稱(chēng)。本文在實(shí)地考察后對(duì)河南新密的地質(zhì)環(huán)境和密玉礦區(qū)的產(chǎn)狀進(jìn)行介紹,對(duì)影響密玉形成的因素進(jìn)行分析,使用常規(guī)寶石學(xué)儀器及顯微硬度計(jì)對(duì)密玉的寶石學(xué)特征進(jìn)行測(cè)試,并采用電子探針、拉曼光譜、X熒光光譜、X射線衍射分析等現(xiàn)代測(cè)試技術(shù)對(duì)密玉的顏色和結(jié)構(gòu)成因進(jìn)行系統(tǒng)的研究,確定其礦物組成,分析不同顏色密玉的致色機(jī)理,為開(kāi)發(fā)利用密玉資源提供理論依據(jù)。密玉產(chǎn)出狀態(tài)為脈狀、扁豆?fàn)?在助泉寺礦區(qū)呈斷續(xù)分布,礦體為石英巖,地層性質(zhì)穩(wěn)定,多呈層狀,受褶皺控制,斷裂發(fā)育,綠色密玉呈脈狀賦存于裂隙中。密玉顏色以白色和綠色為主,另有紅、紫、黃、黑及數(shù)種顏色的混合色調(diào)。密玉為玻璃光澤至油脂光澤,半透明至微透明,折射率1.54,相對(duì)密度為2.631~2.658,紫外熒光惰性,濾色鏡下僅綠色密玉顯示暗紅色,顯微硬度換算成摩氏硬度為:6.4~6.9。密玉的結(jié)構(gòu)主要為花崗變晶結(jié)構(gòu)、微細(xì)粒結(jié)構(gòu),塊狀構(gòu)造。XRF分析顯示,密玉化學(xué)成分的平均含量為SiO2=98.13%,其次為Al2O3=0.67%,Fe2O3=0.24%,K2O=0.18%,CaO=0.16%,MgO=0.06%,Na2O,Ti O2微量。不同顏色密玉的主要成分基本不變,次要化學(xué)成分隨顏色變化而有所差別。綠色密玉Cr含量較高;黃、紅、紫、黑密玉具有較高的Fe含量。通過(guò)偏光顯微鏡觀察,并結(jié)合電子探針、X射線粉晶衍射、拉曼光譜等大型儀器測(cè)試,得出密玉是顯晶質(zhì)石英質(zhì)玉石,主要礦物為石英,含量在97%以上,次要礦物有絹云母、鋯石、電氣石、鐵質(zhì)礦物等。綠色密玉中的綠色部分主要為絹云母,位于石英裂隙之間或石英上,黃色密玉中球粒狀針鐵礦呈黃色,沿石英顆粒間隙分布,紅色、黑色密玉中的片狀赤鐵礦使其色,赤鐵礦顆粒薄,則色淺呈紅色,顆粒厚者色深,為黑色,紫色密玉中赤鐵礦分布,紫色成因與之相關(guān)。
[Abstract]:Miyu is quartz jade, produced in Mixian, Henan Province, now Xinmi City, fine texture, red, yellow, purple, black and other colors, and bright green. This paper introduces the geological environment and occurrence of Miyu mining area in Xinmi, Henan Province, and analyzes the factors that affect the formation of Miyu. The gemstone characteristics of Miyu were tested by conventional gemstone apparatus and microhardness tester. The electron probe Raman spectra and X-ray fluorescence spectra were used. X-ray diffraction analysis and other modern testing techniques are used to systematically study the origin of the color and structure of Miyu, to determine its mineral composition and to analyze the chromogenic mechanism of Miyu with different colors. In order to provide theoretical basis for the exploitation and utilization of Miyu resources, the production state of Miyu is vein-like and lentil, which is intermittently distributed in Junquansi mining area, and the orebody is quartzite with stable stratigraphic properties, mostly stratified and controlled by folds. The color of the jade is mainly white and green, and there is a mixture of red, purple, yellow, black and several colors. Miyu is glass-gloss to grease luster. The index of refraction is 1.54, the relative density is 2.631 ~ 2.658, the ultraviolet fluorescence is inert, and only green jade shows dark red in the filter. The microstructure of Miyu is mainly granitic structure, fine grain structure and block structure. XRF analysis shows that the microhardness is: 1. 6. 4 and 6. 9. The microstructure of Miyu is mainly composed of granitic structure, fine grain structure and block structure. The average content of chemical composition of Miyu is 98.13% Sio _ 2, followed by 0.67% Al _ 2O _ 3 and 0.24% K _ 2O _ 3. CaO0.16% MgO0.06 is a trace amount of Na _ 2O _ 2O _ 2 TIO _ 2. The main components of different colors of Miyu are basically unchanged. The secondary chemical composition is different with the change of color. The content of Cr in green Miyu is higher. Yellow, red, purple and black jade have high Fe content. Observed by polarizing microscope, combined with electron probe X-ray powder diffraction, Raman spectroscopy and other large-scale instruments. It is concluded that Miyu is a crystal quartz jade, the main mineral is quartz, the content of which is more than 97%, the secondary minerals are sericite, zircon, tourmaline, iron minerals, etc. The green part of green Miyu is mainly sericite. Located between the quartz fissures or on quartz, the globular goethite in the yellow jade is yellow and distributes along the quartz grain gap. The red and black hematite make it color, the hematite particle is thin, then the color is light red. The color of thick particles is black, purple dense jade hematite distribution, purple origin is related to it.
【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】：2017
【分類(lèi)號(hào)】：P619.28

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本文編號(hào)：1471613