本文選題：祖母綠礦床 + 礦物學特征　； 參考：《中國地質(zhì)大學(北京)》2015年碩士論文

【摘要】：新疆南部達布達祖母綠礦床是于2004年首次發(fā)現(xiàn)產(chǎn)出于碳酸鹽巖脈的較優(yōu)質(zhì)的祖母綠礦床。本論文通過對前人地質(zhì)資料的充分挖掘和歸納類比、野外地質(zhì)調(diào)研,運用多種分析測試手段著重進行對新疆祖母綠寶石的礦物學特征、光譜特征的分析研究,并將其與哥倫比亞祖母綠在物理性質(zhì)及譜學特征方面進行了對比研究;初步分析了礦床成因,同時對該區(qū)祖母綠礦床的開發(fā)現(xiàn)狀提出思考的意見,為評價該區(qū)祖母綠質(zhì)量和經(jīng)濟價值有較為重要的意義。礦物學研究表明,新疆達布達祖母綠礦的礦石礦物主要為綠柱石和石英,脈石礦物主要為方解石、石英和少量黃鐵礦、電氣石、磷灰石等,礦物組合為綠柱石-方解石-石英組合。電子探針結果表明較高的Cr和Fe含量分別為0.3~0.7%,0.2~0.8%。并從寶石學鑒定特征來看,新疆祖母綠應屬較高品質(zhì)的祖母綠。流體包裹體研究表明,新疆祖母綠流體包裹體均一溫度變化范圍為280~340℃,屬中高溫度流體;鹽度變化范圍為14%~40%,屬高鹽度流體,并估算出成礦流體密度平均值為0.99g/cm3。得出結論,新疆達布達祖母綠成礦流體均一溫度較高,為中高溫、高鹽度流體。譜學特征研究表明:(1)拉曼光譜證實了新疆達布達祖母綠具有穩(wěn)定位移特征的拉曼散射峰,譜峰的總體趨勢一致,樣品不同方向的光譜顯示了綠柱石礦物晶體結構的差異,顯示其流體包裹體中的氣相均以CO2為主。(2)紅外光譜分析表明新疆祖母綠晶體結構中不同方向振動基團存在光譜的差異;CO2含量比哥倫比亞的較高;祖母綠中以II型水占優(yōu),I型水與II型水的振動強度表現(xiàn)出此消彼長的關系。(3)紫外-可見光光譜分析顯示新疆祖母綠樣品與哥倫比亞祖母綠的紫外圖譜基本一致,主要由Cr3+致色;祖母綠顏色產(chǎn)生差異主要與致色離子Cr3+、V3+、Fe3+的含量有關,V3+、Fe3+對其色調(diào)產(chǎn)生微調(diào)作用。在系統(tǒng)對新疆祖母綠流體包裹體特征及光譜學輔助研究的基礎上,結合礦床地質(zhì)特征,認為該礦床屬于碳酸鹽型中高溫熱液型礦床。
[Abstract]:The Dabda emerald deposit in southern Xinjiang is the first high quality emerald deposit found in carbonate veins in 2004. In this paper, the mineralogical and spectral characteristics of emeralds in Xinjiang are analyzed and studied by fully excavating and summing up the geological data and comparing with other geological data, and by means of field geological investigation and many kinds of analytical and testing methods. A comparative study was made on the physical properties and spectral characteristics of the deposit with that of the Colombian emerald, and the origin of the deposit was preliminarily analyzed, and the views on the present situation of the development of the emerald deposit in this area were put forward. It is of great significance to evaluate the quality and economic value of emerald in this area. Mineralogical studies show that the ore minerals of the Dabda emerald deposit in Xinjiang are mainly Beryl and quartz, while the gangue minerals are mainly calcite, quartz and a small amount of pyrite, tourmaline, apatite, etc. The mineral assemblage is a Beryl-calcite-quartz combination. The results of electron probe showed that the higher Cr and Fe contents were 0.30.70 and 0.20.80, respectively. According to the identification characteristics of gemology, Xinjiang emerald should be a high quality emerald. The study of fluid inclusions shows that the homogeneous temperature range of emerald fluid inclusions in Xinjiang is 280 ~ 340 鈩，

本文編號：1825007