本文選題：大化石　切入點(diǎn)：石英　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：廣西大化石是一種觀賞石,產(chǎn)于廣西壯族自治區(qū)河池市大化瑤族自治縣巖灘鎮(zhèn)紅水河流域。大化石是多種礦物組成的集合體,其主要礦物為石英。本文對(duì)大化石的寶石礦物學(xué)等方面進(jìn)行研究,確定其化學(xué)成分、礦物組分以及結(jié)構(gòu)特征,并進(jìn)一步推斷其表皮顏色成因,為廣西奇石市場(chǎng)上色彩艷麗、造型多樣的大化石提供合理的解釋依據(jù)。廣西大化石的表皮顏色主要有兩類:黃和紅色,此外還有黑色、綠色、淺藍(lán)色等。樣品幾乎均不透明,呈層狀結(jié)構(gòu)。棱角有磨圓,但磨圓度不高。點(diǎn)測(cè)其折射率范圍在1.53至1.56之間;密度在2.65至2.76g/cm3之間,在紫外光下其發(fā)光性弱。通過紅外光譜、電子探針和X射線粉晶衍射等測(cè)試分析表明,廣西大化石的礦物成分主要是石英,此外還有少量的長(zhǎng)石、輝石和透閃石等礦物。用鹽酸將其表皮溶解,將溶液用化學(xué)方法測(cè)試,測(cè)試結(jié)果表明其含有Fe3+、Fe2+和Mn2+。同時(shí)還有樣品遇酸冒泡,含CO32-。在單偏光下和正交偏光鏡下,大化石樣品薄片中石英、長(zhǎng)石多呈粒狀結(jié)構(gòu),有黑色泥質(zhì)物呈浸染狀?yuàn)A雜其間;透閃石呈柱狀結(jié)構(gòu)和纖維狀、束狀結(jié)構(gòu)。在掃描電鏡下觀察大化石樣品表面形貌,發(fā)現(xiàn)石英、長(zhǎng)石多為粒狀,粒徑約5-10μm;透閃石多呈纖維狀和柱狀,纖維長(zhǎng)約8-15μm,寬約1μm;具有半定向。結(jié)合地質(zhì)概況,推斷廣西大化石為原巖硅質(zhì)巖在經(jīng)過火山噴發(fā)和侵入作用后,發(fā)生硅化、黃鐵礦化、大理巖化等,其碎屑物質(zhì)被剝蝕,經(jīng)沉積作用,后又發(fā)生了低溫弱變質(zhì)作用,最終形成大化石。目前,廣西奇石市場(chǎng)穩(wěn)步發(fā)展,大化石的市場(chǎng)前景很大,對(duì)大化石的開發(fā)利用由以前粗獷式轉(zhuǎn)型為以文化產(chǎn)業(yè)的開發(fā)為方向;但對(duì)大化石的礦物學(xué)特征的研究方面較為缺乏,需要更深入的理論研究,進(jìn)行系統(tǒng)全面的開發(fā),從而打造大化石發(fā)展的產(chǎn)業(yè)規(guī)模。
[Abstract]:Dahua stone in Guangxi is a kind of ornamental stone, which is produced in Hongshui River Basin, Yantan Town, Dahua Yao Autonomous County, Hechi City, Guangxi Zhuang Autonomous region. The main mineral is quartz. In this paper, the authors studied the gemstone mineralogy of the large fossil, determined its chemical composition, mineral composition and structural characteristics, and further inferred the origin of its epidermal color, which is the brilliant color in the market of Qishi in Guangxi. The large fossils in various shapes provide reasonable basis for explanation. The epidermal colors of Dahua stone in Guangxi are mainly of two types: yellow and red, in addition to black, green, light blue and so on. The samples are almost opaque and have a layered structure. The refractive index ranges from 1.53 to 1.56, the density is between 2.65 and 2.76 g / cm ~ 3, and the luminescence is weak in ultraviolet light. The results of infrared spectroscopy, electron probe and X-ray powder diffraction show that the refractive index is in the range of 1.53 to 1.56, and the density is between 2.65 and 2.76 g / cm ~ 3. The mineral composition of Guangxi Dahua stone is mainly quartz, in addition to a small amount of feldspar, pyroxene and tremolite minerals. The epidermis is dissolved with hydrochloric acid, and the solution is tested by chemical method. The results show that the samples contain Fe3 Fe2 and Mn2, and the samples are acid-bubbling and CO32-.The quartz and feldspar in the thin slice of the large fossil sample are mostly granular in structure under single polarized light and orthogonal polarizer. Tremolites are columnar and fibrous, bunchy. The surface morphology of large fossil samples is observed by scanning electron microscope. It is found that quartz, feldspar is mostly granular, its diameter is about 5-10 渭 m, tremolite is mostly fibrous and columnar. The fiber is about 8-15 渭 m in length and 1 渭 m in width; it is semi-directional. Combined with the geological survey, it is inferred that the detrital material of Dahua stone in Guangxi is denudated after volcanic eruptions and intrusions, such as silicification, pyrite, marble, etc. After sedimentation, the low-temperature weak metamorphism took place and finally formed the big fossils. At present, the market of Qishi in Guangxi is developing steadily, and the market prospect of the big fossils is very great. The development and utilization of large fossils have been transformed from rough to cultural industries, but the study of mineralogical characteristics of large fossils is relatively scarce, so it is necessary to carry out more in-depth theoretical research and systematic and comprehensive development. In order to create a large fossil development of the industrial scale.
【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】：2015
【分類號(hào)】：P575

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 姚雪;;云南黃色硅質(zhì)巖玉的寶石學(xué)特征[J];寶石和寶石學(xué)雜志;2007年02期

2 李舉子;吳瑞華;凌瀟瀟;李青會(huì);;和田軟玉的化學(xué)成分和顯微結(jié)構(gòu)研究[J];寶石和寶石學(xué)雜志;2009年04期

3 支穎雪;廖冠琳;陳瓊;李英哲;周征宇;;貴州羅甸軟玉的寶石礦物學(xué)特征[J];寶石和寶石學(xué)雜志;2011年04期

4 鄭曙;張素新;;電子探針波譜準(zhǔn)確定量分析方解石的方法研究[J];電子顯微學(xué)報(bào);2006年S1期

5 陳和生;孫振亞;邵景昌;;八種不同來源二氧化硅的紅外光譜特征研究[J];硅酸鹽通報(bào);2011年04期

6 陳全莉;袁心強(qiáng);賈璐;;臺(tái)灣藍(lán)玉髓的振動(dòng)光譜表征[J];光譜學(xué)與光譜分析;2011年06期

7 陶文;廣西硅質(zhì)巖建造與成礦作用[J];廣西地質(zhì);2002年02期

8 陳全莉;包德清;尹作為;姚偉;;“佘太翠”玉的振動(dòng)光譜表征[J];光譜學(xué)與光譜分析;2013年10期

9 羅書瓊;劉迎新;施光海;;廣東乳源彩石的礦物學(xué)特征及顏色成因研究[J];寶石和寶石學(xué)雜志;2013年03期

10 王鐵柱;車林睿;余金杰;陸邦成;;寧蕪地區(qū)梅山鐵礦床礦物的電子探針分析和稀土元素地球化學(xué)特征[J];中國(guó)地質(zhì);2014年06期

相關(guān)碩士學(xué)位論文 前1條

1 劉鑫鑫;南京六合方山沉積礫石層中瑪瑙雨花石礦物學(xué)研究[D];南京大學(xué);2013年

，

本文編號(hào)：1578997