摘要
陈家庄伟晶岩型铀矿床,位于北秦岭加里东褶皱带东段的商丹地区。该矿床的主要含矿岩石为黑云母伟晶岩。通过对含矿黑云母伟晶岩中黑云母的矿物学研究,确定形成含矿岩石中的黑云母为原生富铁的黑云母。7件样品共15个探针数据的w(TiO_2)为2.66%~3.91%,Mg/(Mg+Fe^T)比值为0.37~0.49。利用黑云母全铝压力计计算得到的初始结晶压力平均在270 MPa,相当于平均深度10.2km。黑云母的结晶温度介于656℃~717℃,形成于低的氧逸度环境。矿物化学特征显示形成黑云母伟晶岩的岩浆为过铝质。矿物组合和矿物化学特征指示陈家庄黑云母伟晶岩的成因类型为S型花岗岩。
The mineralogical characteristics of biotite in the Chenjiazhuang pegmatite type uranium deposit in eastern section of the North Qinling Caledonian fold belt are studied. It reveals that the biotite belongs to lepidomelane. Analysis of 7 samples shows that the TiO2 content ranges from 2. 66% to 3.91% ,and the value of Mg/（Mg＋FeT） is in the range of 0. 37-0. 49. The initial crystallization pressure calculated by the biotite all aluminum pressure gauge is 270 MPa, equivalent to the average depth of 10.2 km. It is indicated that the crystallization temperature of biotite is 656 ℃-717 ℃ ,formed in a low oxygen fugacity environment. Mineral chemical characteristics show that the magma is peraluminous,and according to its mineral association and chemistry of biotite, the pegmatite belongs to S-type granite.
作者
凌锦兰
田浩浩
王建国
胡小佳
LING Jinlan;TIAN Haohao;WANG Jianguo;HU Xiaojia(Sino Shaanxi Nuclear Industry Group ,Xi＇an 710100,China;224 Brigade Company Limited of Sino Shaanxi Nuclear Industry Group Xi＇an 710024, China)
出处
《矿物岩石》
CAS
CSCD
北大核心
2018年第2期13-19,共7页
Mineralogy and Petrology
基金
中陕核工业集团公司科技创新项目:陕西省商丹地区花岗岩铀成矿规律研究(61160103)
关键词
陈家庄
伟晶岩
黑云母
矿物学
Chenjiazhuang
pegmatite
biotite
mineralogy
