| 何玉坤.广西全州铀矿田流体地球化学及其成矿意义[J].地质与勘探,2010,46(4): |
| 广西全州铀矿田流体地球化学及其成矿意义 |
| Fluid Geochemistry and Its Mineralization Significance of the UraniumOre Deposit in Quanzhou,Guangxi Province |
| 投稿时间：2010-05-06 修订日期：2010-07-02 |
| DOI： |
| 中文关键词: 铀矿床 流体包裹体 矿床成因 全州铀矿田 同位素 |
| 英文关键词: uranium ore deposit,fluid inclusion,genesis of the Deposit,uranium ore field in Quanzhou,isotope |
| 基金项目:国家自然科学基金(编号:40573033)资助 |
|
| 摘要点击次数: 2390 |
| 全文下载次数: 1452 |
| 中文摘要: |
| [摘要]位于广西全州的铀矿床为中型铀矿床。含矿岩层主要为泥盆系四排组、东岗岭组和榴江
组地层。此区域矿床受新宁―资源―灵川(麻城―广济)断裂的分枝及其次级断裂Fl、F3 等控制。古花
岗岩提供了铀源。在浅部环境下,碳酸根络合物[UO2(CO3 )3 ]4- 和[UO2(CO3 )2 ]2- 发生分解形成UO2
2+
(也可能与F-结合形成UO2 F4
2- ),并最终沉淀形成铀矿床。选取穿插于四排组地层和花岗岩中石英脉
或花岗岩样品,对其中的石英进行流体包裹体均一法测温和爆裂法测温。流体包裹体类型为气液包裹
体、含子晶包裹体、富气包裹体和CO2 包裹体。绝大部分为气液包裹体,均一法实验测得的冰点温度显
示盐度较高,平均盐度为10. 3%。含子矿物包裹体的存在说明流体的密度和盐度较高。包裹体均一温
度差别较大,但整体集中在200益~280益,气液包裹体平均均一温度222益。爆裂法实验测得爆裂温度
350益左右。较高的捕获温度和高的盐度说明成矿流体与岩浆热液密切相关。选取样品进行碳同位素
测试,得出碳的来源为岩浆碳,选取样品进行氢氧同位素测试,表明流体来源既有岩浆源,又有与岩浆热
液密切相关的大气降水来源。两个矿化点样品含黑钨矿样品和白钨矿指示了钨的矿化,又由于U-W 的
共生进而指示了铀的矿化。结合野外观察和地球化学样品分析的数据,成矿主要和燕山期岩体有密切
的成因联系。 |
| 英文摘要: |
| Abstract:The uranium ore deposit located in Guangxi Quanzhou is of medium size,where the ore-bearing rocks are mainly in the strata of Devonian
Sipai,Donggang Ling and Liu Jiang Groups. This deposit is controlled by the branching and secondary faults of the Xinning-Ziyuan-Lingchuan (Macheng
-Guangji). fault zone Ancient granites provided a source of uranium. In the shallow environment,the carbonate complex [UO2(CO3 )3 ]4- and [UO2
(CO3 )2 ]2- were decomposed to UO2 2+(probably combined with F- to form UO2 F4 2- ),and finally these substances formed the uranium deposit. This
work selects samples of granite and quartz in the Sipai Group which penetrates in granite to measure temperature of its quarts inclusions using the uniform
and burst methods. Data analysis shows that the main types of fluid inclusions are gas-liquid inclusion,inclusion of sub-crystal,gas-rich inclusion and
CO2 inclusion. Most of the inclusions are gas-liquid inclusions. According to the uniform method of measurement at the freezing temperature the data dis鄄
play high salinity and the average salinity of 10. 3%. There are many inclusions of sub-crystal which display salinity of the over-saturated;the uniform
temperatures are different,but the overall concentrates in 200 益~280 益. The average homogeneous temperature of the gas-liquid inclusions is 222 益.
According to burst experiment,the measured temperature of burst is around 350 益. High temperature and high salinity indicate that ore-forming fluids are
closely related with magmatic hydrothermal fluids. This work also selects the sample for carbon isotope test,and the result shows that the carbon was derived
from magma carbon. Oxygen isotope test and hydrogen isotope test on the samples demonstrate that the fluid source is atmospheric precipitation,and also re鄄
lated with magmatic hydrothermal activity. Samples including wolframite and scheelite indicate the tungsten mineralization. Because of the U-W symbiotic,
they further indicate uranium mineralization. Combined with the field observations and geochemical analysis of the sample data, this study suggests that
mineralization of this ore deposit is closely related with rocks of the Yanshan period. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
