| 刘金辉.下庄铀矿田成矿古水热系统的同位素研究及其应用[J].地质找矿论丛,1997,(2):50-56 |
| 下庄铀矿田成矿古水热系统的同位素研究及其应用 |
| ISOTOPIC STUDY AND APPLICATION OF THE ORE-FORMING FOSSIL HYDROTHERMAL SYSTEM IN XIAZHUANG URANIUM FIELD |
| 投稿时间：1997-03-31 修订日期：1997-05-29 |
| DOI：10.6053/j.issn.1001-1412.1997.2. 006 |
| 中文关键词: 成矿古水热系统 同位素 下庄铀矿田 |
| 英文关键词:ore-forming fossil hydrothermal system isotope Xiazhuang uranium field |
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| 中文摘要: |
| 在分析下庄铀矿田成矿地质背景的基础上,对该矿田矿物和包体水的氢、氧同位素组成,岩石蚀变体系的氧同位素组成,沥青铀矿的铅同位素组成和方解石的碳同位素组成进行了较为系统的研究。研究结果表明,成矿期下庄铀成矿热液的氢、氧同位素组成具有已发生明显“氧漂移”的大气降水同位素特征;与岩石相互作用的古地下水具有低δ18O值:不同水／岩比值条件下大气降水与岩石同位素交换平衡的δ18O计算值与成矿期铀成矿热液的δ18O值相吻合。沥青铀矿中的初始铅属地壳放射成因。方解石的δ13C值（─6.071‰～—9.228‰（PDB))正好位于岩浆碳或深源变质碳范围。由此得到下庄铀成矿古水热系统的水源属大气降水成因,铀主要来自围岩,矿化剂（CO2)来自深部岩浆源或变质碳的结论。 |
| 英文摘要: |
| On the basis of analysis for ore-forming geological setting in xiazhuang field, the author systematically studies hydrogen and oxygen isotopic compositions of mineral and inclusion, oxygenisotopic composition of rock alteration system, lead isotopic compolsition of pitchblende and carbon isotopic composition of pitchblende and carbon isotopic composition of calcite. The resultssuggest that δD and δ18O values of uranium ore-forming hydrothermal solution in minerlization epoch are characteristic of the isotope for meteoric water with obvious "oxygen drift". Before interacting with rock, the ancient underground water has low δ18O value. The initial lead in pitchblende belongs to radioactive origin from crust. The δ13C values in calcite (-6.071～-9.228‰(PDB)) are just in the range of magmatic or deep metamorphic carbon. Therefore, The watersource, uranium source and mineralizer source should derive from meteoric water, surroundingrock and deep magmatic or metamorphic carbon respectively. |
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