本文選題：黑云母 + 綠泥石�。� 參考：《地學(xué)前緣》2017年05期

【摘要】：長江巖體和九峰巖體同為粵北諸廣山復(fù)式巖體中的燕山期花崗巖體,它們的礦化特征具有顯著差異,是諸廣山地區(qū)典型的產(chǎn)鈾巖體和不產(chǎn)鈾巖體。本文利用電子探針對兩巖體中黑云母和綠泥石開展了詳細的礦物化學(xué)研究。結(jié)果顯示,長江巖體中黑云母富鐵貧鎂,為鐵葉云母,黑云母綠泥石化較為嚴重,綠泥石類型主要是蠕綠泥石和鐵鎂綠泥石,偏鐵質(zhì)綠泥石,主要形成于較還原環(huán)境;九峰巖體中黑云母為鐵質(zhì)黑云母,綠泥石化較弱,綠泥石類型多為蠕綠泥石、鐵鎂綠泥石和密綠泥石,偏鎂質(zhì)綠泥石。黑云母的成分特征顯示,長江巖體結(jié)晶溫度為600~650℃,氧逸度lgf(O2)為-16~-17,揮發(fā)分組成顯示出相對高F、低Cl的特征;九峰巖體結(jié)晶溫度為680~720℃,氧逸度lgf(O2)為-14~-15,揮發(fā)分組成顯示出相對低F、高Cl的特征。綜合地質(zhì)特征和礦物化學(xué)特征可知,較低的溫度和氧逸度、較高的揮發(fā)分F含量是巖體產(chǎn)鈾的有利因素。
[Abstract]:The Yangtze and Jiufeng intrusions are both Yanshanian granitic bodies in the Guangshan complex in northern Guangdong Province. Their mineralization characteristics are different and they are typical uranium-producing and non-uranium-producing rocks in Zhuguangshan area. In this paper, detailed mineralogical studies of biotite and chlorite in the two rock masses have been carried out by using electron probe. The results show that biotite is rich in iron and magnesium in the Yangtze River, which is Ironite. Biotite green mud is more serious. The chlorite types are mainly vermicular chlorite and ferric chlorite, which are mainly formed in the reduction environment. In Jiufeng rock mass, biotite is ferric biotite, and green clay is weak. The chlorite types are vermicular chlorite, ferric magnesium chlorite and dense chlorite, and magnesite chlorite. The composition characteristics of biotite show that the crystallization temperature of the Yangtze rock mass is 600 ~ 650 鈩，

本文編號：1880291