【摘要】：軟玉,中國玉文化的代表者,以其溫潤柔和的光澤和凝重的質(zhì)感而受到人們的喜愛。隨著新疆和田地區(qū)軟玉資源的日漸短缺,市場上高品質(zhì)軟玉的價格被炒的越來越高,仿制品的種類與作假手段也越來越多。近年來,青海東昆侖地區(qū)新的軟玉礦逐漸被發(fā)現(xiàn),研究該處軟玉的礦床學(xué)特征成為解決這一問題的關(guān)鍵。本文在此基礎(chǔ)上對青海格爾木納赤臺軟玉礦區(qū)的樣品進(jìn)行了研究。青海格爾木納赤臺軟玉礦區(qū)位于東昆侖斷裂帶的構(gòu)造背景中,圍巖為上元古界萬寶溝群碳酸鹽巖組,礦區(qū)內(nèi)出露的巖體有基性輝綠巖、花崗閃長巖、蛇紋巖、鎂質(zhì)碳酸鹽、透閃石質(zhì)大理巖等。通過野外進(jìn)行實地采樣后,我們對樣品進(jìn)行了挑選,選取不同巖體及巖體間交界過渡處的樣品進(jìn)行研究。研究過程主要包括手標(biāo)本觀察描述、相對密度測試、切磨薄片、對薄片進(jìn)行顯微鏡下觀察、折射率測試、電子探針測試、X射線粉晶衍射測試等。通過對測試數(shù)據(jù)進(jìn)行整理分析,確定該地所產(chǎn)透閃石質(zhì)大理巖的結(jié)構(gòu)、構(gòu)造以及玉化程度。其中透閃石化程度高的部分呈白色至淡青色,弱油脂光澤,折射率平均值為1.61,相對密度最高可達(dá)2.9215,可定名為軟玉。電子探針結(jié)果顯示玉化部分的巖石成分中主要有透閃石、方解石、滑石。薄片觀察透閃石有顯微隱晶、顯微纖維等多種形態(tài)。圍巖為鎂質(zhì)大理巖,侵入巖有加里東期花崗閃長巖、基性輝綠巖,并有后期多次巖漿熱液侵入。圍巖、侵入巖、后期熱液之間發(fā)生活躍的離子交換形成了透閃石,并伴隨著強烈的構(gòu)造運動。基性輝綠巖蝕變程度較高,出露部分的輝石基本完全蝕變?yōu)榫G泥石、方解石、陽起石�；◢忛W長巖、鎂質(zhì)碳酸鹽、基性輝綠巖、后期熱液對軟玉的形成缺一不可。
[Abstract]:Nephrite, the representative of Chinese jade culture, is loved by people for its gentle luster and dignified texture. With the increasingly shortage of nephrite resources in Hotan area of Xinjiang, the price of high-quality nephrite is being speculation higher and higher, and the kinds and means of counterfeiting are more and more. In recent years, new nephrite deposits in East Kunlun area of Qinghai Province have been gradually discovered, and the key to solve this problem is to study the ore deposit characteristics of the nephrite deposits there. On this basis, the samples of Nachitai nephrite mining area in Golmud, Qinghai Province are studied. In the tectonic setting of the East Kunlun fault zone, the Naqitai nephrite ore area in Golmud, Qinghai Province is located in the carbonate rock formation of the Upper Proterozoic Wanbaogou Group. The exposed rock bodies in the mining area include basic diabase, granodiorite, ophiolite, magnesia carbonate, etc. Tremolite marble, etc. After sampling in the field, we selected samples from different rock masses and their intersections. The research process mainly includes hand specimen observation description, relative density measurement, cutting and grinding thin slice, microscope observation, refractive index test, electron probe test, X-ray powder diffraction test, etc. Based on the analysis of test data, the structure, structure and jade degree of tremolite marble produced in this area are determined. The part with high tremolization degree is white to light blue, weak oil luster, average index of refraction is 1.61, the highest relative density can reach 2.9215, can be named as nephrite. The electron probe results show that there are mainly tremolites, calcite and talc. The tremolites were observed to have microcrystalline, microscopic fibers and many other forms. The surrounding rock is magnesia marble. The intrusive rocks include Caledonian granodiorite, basic diabase and late magmatic hydrothermal intrusion. The active ion exchange between the surrounding rock, intrusive rock and hydrothermal solution forms tremolite, which is accompanied by strong tectonic movement. The basic diabase is highly altered, and the exposed pyroxene is completely altered into chlorite, calcite and actinolite. Granodiorite, magnesite carbonate, basic diabase, late hydrothermal formation of nephrite is indispensable.
【學(xué)位授予單位】：中國地質(zhì)大學(xué)(北京)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P619.28

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本文編號：2157671