發(fā)布時間：2018-04-06 00:03

  本文選題：孟素紅寶石　切入點(diǎn)：礦物組成　出處：《昆明理工大學(xué)》2016年碩士論文

【摘要】：緬甸孟素紅寶石礦區(qū)發(fā)現(xiàn)于1991年,是已知大理巖型紅寶石礦區(qū)中較新的礦床,目前國內(nèi)對孟素紅寶石礦床系統(tǒng)研究的較少。因此,系統(tǒng)研究該礦床礦物特征、礦物結(jié)構(gòu)構(gòu)造和成因,有助于深化對緬甸紅寶石礦床的認(rèn)識,對探討大理巖型紅寶石礦床有著重要意義。本文利用偏光顯微鏡、X射線粉晶衍射、紅外光譜及激光拉曼光譜對孟素紅寶石礦床的礦物結(jié)構(gòu)及組分進(jìn)行研究,運(yùn)用電子探針分析技術(shù)測試礦床的化學(xué)元素成分。結(jié)果表明：(1)礦物結(jié)構(gòu)主要為碎屑結(jié)構(gòu)和粒狀變晶結(jié)構(gòu)。(2)礦床主體以白云石為主含有少量的磁黃鐵礦和方解石,屬于鎂質(zhì)大理巖；而圍巖的礦物成分以方解石、云母為主,含有少量的石英、鈉長石、透閃石、磁黃鐵礦、綠泥石、石榴石等變質(zhì)巖,變質(zhì)巖相歸屬為綠片巖相。(3)電探結(jié)果顯示外圍圍巖均為方解石含微量的Mg,主體礦床為白云石。在礦床的的圍巖和主體礦床中都含有豐富的A1元素,在圍巖中含有多種微量元素Si、Cl、K、Cr、Zn、Ti、Nb等。(4)依據(jù)顯微結(jié)構(gòu)和微量元素的分析,將孟素紅寶石礦床的形成過程劃分為區(qū)域變質(zhì)成巖階段和熱動力作用成礦階段。礦床主體白云石形成于區(qū)域變質(zhì)作用早期中低溫度和壓力的變質(zhì)環(huán)境中,隨著溫度升高到390℃-400℃左右時,方解石和白云石之間發(fā)生Mg2+交換,礦床圍巖都轉(zhuǎn)化為方解石：①原巖中所含的水及其他具揮發(fā)性的組分被分離出來,②巖石孔隙和裂隙中以水為主的溶劑也揮發(fā)出來,③從地殼中分泌出來含K、Na及Si02等化學(xué)物質(zhì)的熱液,通過以上三種途徑析出的以H2O和CO2為主的化學(xué)活動性流體會進(jìn)入方解石礦物中并賦存在其晶格缺陷或者包裹體內(nèi)。之后在礦體與圍巖的接觸帶上發(fā)生過多期次強(qiáng)烈的動力變質(zhì)作用,使紅寶石礦床的圍巖受到強(qiáng)烈擠壓,形成粒度小于0.5mm的礦物碎屑,并且形成新的礦物絹云母,同時在這一過程中交代生成鈉長石。
[Abstract]:The Mengsu ruby deposit in Myanmar was discovered in 1991 and is a relatively new deposit in the known marble ruby deposit. At present, there is little systematic research on the Mengsu ruby deposit in China.Therefore, a systematic study of the mineral characteristics, mineral structure and genesis of the deposit is helpful to deepen the understanding of the ruby deposit in Myanmar and is of great significance to the exploration of the marble ruby deposit.In this paper, the mineral structure and composition of Mengsu ruby deposit are studied by means of X-ray powder diffraction, infrared spectroscopy and laser Raman spectroscopy. The chemical element composition of the deposit is measured by electron probe analysis (EPMA).The results show that the main mineral structure of the deposit is clastic structure and granular metamorphic structure. The main body of the deposit is dolomite, which contains a small amount of pyrrhotite and calcite, which belongs to magnesite marble, while the mineral composition of surrounding rock is calcite and mica.It contains a small amount of quartz, albite, tremolite, pyrrhotite, chlorite, garnet and other metamorphic rocks, and the metamorphic facies belong to greenschist facies.There are abundant A1 elements in the surrounding rock and main deposit of the deposit, and a variety of trace elements, such as SiClClC, K, Zn, TiNb, etc., in the surrounding rock.) based on the analysis of microstructure and trace elements,The forming process of Mengsu ruby deposit is divided into regional metamorphic diagenetic stage and thermodynamic metallogenic stage.The dolomite was formed in the metamorphic environment of low temperature and low temperature in the early stage of regional metamorphism. With the increase of temperature to about 390 鈩，

本文編號：1717055