本文選題：錫石　切入點：成因礦物學(xué)　出處：《昆明理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：論文依托國家自然科學(xué)基金項目“個舊超大型錫礦床錫石礦物學(xué)、礦物化學(xué)、礦物U-Pb年代學(xué)研究”,對個舊錫礦錫石的成因礦物學(xué)和流體包裹體特征進行一個系統(tǒng)研究,為進一步揭示個舊錫礦床的形成環(huán)境和成因提供科學(xué)依據(jù)。本文對個舊錫礦老廠礦田和松樹腳礦田的塊狀硫化物型錫銅礦、電氣石細脈型錫鎢鉍礦、含錫白云巖、層間氧化礦礦床中的錫石進行了分析研究,利用掃描電鏡、陰極發(fā)光成像技術(shù)、X-射線粉晶衍射、電子探針、包裹體測溫和激光拉曼技術(shù),錫石單礦物進行了錫石顆粒的大小、錫石晶體錐和柱的發(fā)育情況、錫石晶體的內(nèi)部結(jié)構(gòu)、錫石晶胞參數(shù)、錫石中類質(zhì)同像的元素的含量,錫石均一溫度和成礦環(huán)境的研究,研究表明：(1)塊狀硫化物型、電氣石細脈型、含錫白云巖型、層間氧化型礦床的錫石顆粒體積依次變小；(2)四種礦床類型中錫石的晶型共有7個類型：A類型：{111}+{110}+{321}+{100}：B類型：{111}+{110}；C類型：{321}+{111}+{221};D類型：{111}+{110}+(102)+(321)；E類型：{111}+{110}+{100}；F類型：{111}+{101}+{110}+{100}；G類型：{111}+{123}+{110},從塊狀硫化物型到層間氧化型礦床中錫石由錐面較發(fā)育逐漸向柱面較發(fā)育發(fā)展；(3)塊狀硫化物型礦床中深色錫石晶胞體積大于淺色錫石晶胞體積；(4)塊狀硫化物型、電氣石細脈型、含錫白云巖型礦床類型中錫石的CL亮度差異將錫石分為早、晚兩期錫石；(5)塊狀硫化物型、電氣石細脈型、含錫白云巖型礦床中錫石在CL下出現(xiàn)的環(huán)帶是生長層,而不是由于化學(xué)成分的差異形成的生長環(huán)帶；(6)塊狀硫化物型、電氣石細脈型、含錫白云巖型、層間氧化型礦床類型中錫石成礦流體溫度逐漸降低,同時錫石顆粒由大逐漸變�。�(7)成礦壓力的增大使得晶體的a、c、v變�。�(8)結(jié)合錫石包裹體溫度、鹽度、密度、成礦壓力深度的研究,認為塊狀硫化物型、電氣石細脈型、含錫白云巖型礦床屬于花崗巖漿期后熱液疊加改造成因,松樹腳層間氧化型礦床屬于重泥質(zhì)沉積形成。
[Abstract]:Based on the National Natural Science Foundation project "cassiterite Mineralogy, Mineral Chemistry, Mineral U-Pb chronology of Gejiu Super large Tin Deposit", this paper makes a systematic study on the genetic mineralogy and fluid inclusion characteristics of cassiterite in Gejiu tin deposit. In order to further reveal the forming environment and genesis of Gejiu tin deposit, this paper deals with the massive sulphide type tin copper deposit, tourmaline thin vein tin tungsten bismuth ore and tin dolomite in the Laochang and Songshujiao ore fields of Gejiu tin mine. The cassiterite in the interlayer oxidized ore deposit has been analyzed and studied. The particle size of cassiterite has been carried out by means of scanning electron microscope, catholuminescence imaging technique, X-ray powder diffraction, electron probe, inclusion temperature measurement and laser Raman technique. The development of cassiterite crystal cone and column, the internal structure of cassiterite crystal, the parameters of cassiterite crystal, the content of cassiter-like elements in cassiterite, the homogenization temperature of cassiterite and the metallogenic environment are studied. Tourmaline vein type, tin dolomite type, The grain volume of cassiterite in the interlayer oxidized deposit has been reduced in turn) among the four deposit types, there are seven types of cassiterite type: type A: type {111} {110} {100}: type B: type {111} {110} {221} D: type {111} {110} (102) E: type {111} {110} {100} F: type {111} {101} {110} {100} G. Type: {111} {123} {110}, from massive sulphide type to interlayer oxidation type deposit, cassiterite develops gradually from cone to cylinder. CL luminance difference of cassiterite in tourmaline thin vein type and tin dolomite type deposit type: cassiterite is divided into early and late cassiterite sulphide type, tourmaline fine vein type, tin dolomite type deposit and cassiterite ring zone under CL is the growth layer. Not because of the difference of chemical composition, the temperature of cassiterite ore-forming fluid decreases gradually in the type of growth ring, such as massive sulphide type, tourmaline vein type, tin dolomite type, and interlayer oxidation type deposit type. At the same time, with the increasing of the mineralizing pressure of cassiterite particles from large to small), the au _ (cv) of the crystals becomes smaller and smaller. (8) in combination with the study of the temperature, salinity, density and ore-forming pressure depth of cassiterite inclusions, it is considered that the massive sulphide type and the tourmaline veinlet type are considered to be massive sulphide type and tourmaline veinlet type. The tin dolomite type deposit belongs to the genesis of post-granitic magmatic superposition reformation, and the Songshujiao interlayer oxidation type deposit belongs to heavy argillaceous deposit.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P618.44

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