| 氯同位素地质应用研究 |
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| 关键词:chloride isotopes geological applications |
| 基金项目:本文由国家自然科学基金项目（编号40221301)资助 |
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| Geological Applications of Chloride Isotopes |
| Chlorine has two stable isotopes, 15C1 and 37C1, with their abundance being 75.53% and 24.47% respectively. Their large relative mass difference suggests that these isotopes should be fractionated during the reactions between aqueous chloride solutions and solid phases in which Cl is at least partly bonded. Large fractionation of Cl isotopes occurs in nature with aδ37C1 variation about 15‰. Chloride isotope composition in modern oceanic water is uniform, so seawater has been suggested as the chlorine isotope standard, SMOC. The river water shows a wideδ37C1 variation of + 0.74‰~+2.85‰, the groundwater displays aδ37C1 variation of -0.5‰~+0.69‰, andδ37C1 of Salt lake fluids vary from-2.06‰ to +1.01‰. The mid-ocean ridge basalts(MORB) have a largeδ37C1 variation of +3.2‰~+7.2‰, whereas the granites show very smallδ37C1 variations of -0.3‰~+0.11‰, The carbonatites haveδ37C1 ratios between -0.8‰ and +0.1‰, whereas the halites haveδ37C1 values of-0.6‰~+1.2‰. Now, the largeδ37C1 variations in nature have made Cl isotope composition a very sensitive geochemical tracer, which can be used mainly in such fields as atmospheric aerosol, mid-ocean ridge basalt, crust-mantle evolution, hydrothermal mineralization and origin and evolution of brines. |
| LI Yanping,JIANG Shaoyong.2005.Geological Applications of Chloride Isotopes[J].Acta Geoscientica Sinica,26(z1):10-11. |
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