本文關(guān)鍵詞： 丹鳳地區(qū) 產(chǎn)鈾巖石 非產(chǎn)鈾巖石 花崗偉晶巖 黑云母　出處：《東華理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：丹鳳地區(qū)位于秦嶺造山帶與華北板塊碰撞縫合部位,是我國(guó)最重要的花崗偉晶巖型鈾礦產(chǎn)區(qū)。本文以丹鳳地區(qū)陳家莊和光石溝鈾礦床為研究對(duì)象,在巖(礦)相學(xué)研究的基礎(chǔ)上,對(duì)產(chǎn)鈾巖石和非產(chǎn)鈾巖石中的黑云母開展了精細(xì)礦物學(xué)的研究工作,探討了黑云母的分布特征,確定了礦物共生組合和礦物組分特征,在此基礎(chǔ)之上對(duì)其進(jìn)行了化學(xué)分類,并對(duì)黑云母的n(Fe2+)/n(Fe2++Mg2+)、n(Mg2+)/n(Fe2++Mg2+)、AlⅣ、AlⅥ等特征值及它們之間的關(guān)系進(jìn)行分析研究,探討了黑云母形成的物理化學(xué)條件,綜合對(duì)比了產(chǎn)鈾巖石和非產(chǎn)鈾巖石中黑云母的差異。研究結(jié)果表明:(1)研究區(qū)產(chǎn)鈾巖石主要以黑云母花崗偉晶巖為主,而非產(chǎn)鈾巖石則以黑云母?jìng)ゾ罨◢弾r及黑云母花崗巖為主。無論是產(chǎn)鈾巖石還是非產(chǎn)鈾巖石,黑云母都是主要造巖礦物之一;(2)非產(chǎn)鈾巖石中黑云母主要呈分散狀產(chǎn)出,產(chǎn)鈾巖石和礦石中黑云母則多呈團(tuán)塊狀產(chǎn)出。非產(chǎn)鈾巖石中黑云母多色性明顯,多以鱗片狀鑲嵌在石英、長(zhǎng)石中或礦物粒間;產(chǎn)鈾巖石和礦石中黑云母多色性不明顯,且多呈片狀或團(tuán)簇狀鑲嵌在石英、長(zhǎng)石中或礦物粒間;(3)電子探針分析結(jié)果表明樣品中黑云母主要化學(xué)成分的變化范圍為:SiO2含量變化于33.14~61.07%之間,黑云母的化學(xué)分類屬鐵質(zhì)黑云母,但部分礦石中黑云母則更偏向鎂質(zhì)黑云母。從黑云母化學(xué)成分上看,無論是產(chǎn)鈾巖石還是非產(chǎn)鈾巖石都屬于過鋁質(zhì)S型花崗巖范疇;(4)黑云母化學(xué)成分計(jì)算結(jié)果表明兩個(gè)礦床都形成于高溫、低氧逸度環(huán)境。相較而言,光石溝鈾礦床中的黑云母形成于一個(gè)相對(duì)更低的溫度和氧逸度環(huán)境。非產(chǎn)鈾巖石中黑云母結(jié)晶溫度變化在650℃~710℃之間,而產(chǎn)鈾巖石和礦石中黑云母結(jié)晶溫度相對(duì)更低,且變化在630℃~705℃之間。
[Abstract]:Danfeng area is located in the collision suture between Qinling orogenic belt and North China plate. It is the most important granitic pegmatite type uranium ore producing area in China. This paper takes Chenjiazhuang and Guanshigou uranium deposits in Danfeng area as the research object. On the basis of petrographic study, the fine mineralogical study of biotite in uranium-producing rocks and non-uranium-producing rocks is carried out, and the distribution characteristics of biotite are discussed. The mineral symbiotic assemblages and mineral composition characteristics are determined. On the basis of these, the chemical classification of biotite is carried out, and the content of Fe _ (2 / n) Fe _ (2) Mg2 of biotite is also studied. The characteristic values of mg _ 2 / n ~ (2 +) Fe _ (2) Mg2 and Al _ (鈪，

本文編號(hào)：1480066