摘要
矿物及包裹体水的氢氧同位素组成的研究结果表明 ,相山铀矿田成矿热液的δ18O与δD值分别变化于 - 6 .7‰～ - 7.2‰ (SMOW)和 - 44 .1‰～ - 5 2‰ ,属大气降水成因流体。蚀变体系δ18O的变化情况显示 ,与岩石作用的流体具低δ18O的降水特征。不同水 /岩比值条件下的水—岩同位素平衡交换反应的理论计算和综合分析揭示 ,本矿田的铀成矿热液起源于大气降水与相山主要岩石的相互作用 。
The measurements of oxygen and hydrogen isotopic composition for minerals and liquid inclusions in minerals show that the δ 18 O and δ D values for ore-forming hydrothermal solution in the Xiangshan uranium ore-field range from -9.8‰～+1.8‰(SMOW) and -45.0‰～87.1‰ (SMOW) respectively. The variation of δ 18 O values in the altered system reveal that the water reacted with rocks in the field is of low- δ 18 O meteoric characteristics. Under the conditions of different water/rock ratios, the theoretical calculations for the equilibrium water-rock isotopic exchange reactions indicate that the U ore-forming fluid originated from paleo-meteoric water-rock interaction during the mineralization epoch instead of magmatic origin.
出处
《地质与勘探》
CAS
CSCD
北大核心
2001年第3期20-23,共4页
Geology and Exploration
