FLUID INCLUSION STUDY OF THE SHAZHOU URANIUM OREFIELD IN THE XIANGSHAN DEPOSIT, JIANGXI
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摘要: 对江西相山铀矿田沙洲矿床方解石、石英和萤石流体包裹体的研究发现, 流体包裹体均一温度主要在200~210℃和230~260℃两个区间内, 盐度w(NaCl)分别为11.00%~12.00%和18.00%~20.00%, 平均密度为0.94g/cm3, 成矿压力为168.4×105~433.0×105Pa, 平均值为283.8×105Pa。由压力与深度的关系估算成矿深度值为0.561~1.443km, 平均值为0.946km; 结合流体包裹体成分和稳定同位素等分析, 得出成矿流体主要来自大气水, 并且有岩浆水以及地幔热液的参与。Abstract: Study of fluid inclusions in calcite, quartz and fluorite in the Shazhou deposit, Xiangshan uranium orefield, Jiangxi, indicates that::the homogenization temperatures of ore fluids ranged from 200 to 210℃ and from 230 to 260℃; the salinities ranged from 11.01 to 12.00% wt.% NaCl equivalent and from 18.01 to 20.00% wt.% NaCl equivalent; the average density was 0.94 g/cm3; the oreforming pressures ranged from 168.4×105 to 433.0×105 Pa with an average of 283.8×105 Pa.The oreforming depths estimated based on the relation between pressure and depth ranged from 0.561 to 1.443 km with an average of 0.946 km.According to the abovementioned, combined with an analysis of the composition of fluid inclusions and the stable isotope data, the authors conclude that the ore fluids of the Shazhou uranium deposit were mainly derived from meteoric water, mixed with small amounts of magmatic water and mantle-derived hydrothermal fluids.
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图 1 相山铀矿田地质略图(引自孙占学, 并做部分修改)[6]
K—白垩系; J3e—上侏罗统鹅湖岭组; J3d—上侏罗统打鼓顶组; T3a—上三叠统安源组; Z—南华系-震旦系; γ4—印支期花岗岩; γ2—加里东期花岗岩; γ5—燕山期次花岗斑岩; 1—断裂; 2—矿床; 3—推测火山口; 4—研究区。
Figure 1. Sketch map of the Xiangshan uranium orefield
图 2 沙洲矿床综合流体包裹体均一温度分布直方图
Figure 2. Histogram showing homogenization temperatures of fluid inclusions in the Shazhou deposit
图 3 沙洲矿床方解石包流体裹体均—温度直方图
Figure 3. Histogram showing homogenization temperatures of fluid inclusions of calcite in the Shazhou deposit
图 4 沙洲矿床石英流体包裹体均—温度直方图
Figure 4. Histogram showing homogenization temperatures of fluid inclusions of quartz in the Shazhou deposit
图 5 沙洲矿床萤石流体包裹体均—温度直方图
Figure 5. Histogram showing homogenization temperatures of fluid inclusions of fluorite in the Shazhou deposit
图 6 沙洲矿床流体包裹盐度分布直方图
Figure 6. Histogram showing salinities of fluid inclusions in the Shazhou deposit
图 7 沙洲铀矿床流体包裹体的成矿水溶液δD、18Oδ关系图
Figure 7. δD vs.δ18O diagram of mineralized water solution of fluid inclusions in the Shazhou uranium deposit
表 1 相山矿田沙洲矿床部分矿床矿物包裹体测温数据表
Table 1. Microthermometric data of fluid inclusions in the Shazhou deposit, Xiangshan
表 2 沙洲矿床流体包裹体水和CO2的H、O同位素组成表
Table 2. H and O isotopic compositions of water and CO2 in fluid inclusions in Shazhou
表 3 沙洲矿床矿物及包裹体水的C、O同位素组成
Table 3. C and O isotopic compositions in fluid inclusion water and CO2 in the Shazhou deposit
表 4 沙洲矿床流体包裹体化学成分分析表
Table 4. Chemical composition of fluid inclusions in the Shazhou deposit
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