| 中国南海海水蒸发实验过程中地球化学行径 |
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| 关键词:evaporation of sea water isotope South China Sea |
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| Indoor evaporation experiment on water of south china sea |
| In 1987-1989 we colleced water sampies from South China Sea in Wenchang County,Hainna Province ,conducted indoor isothermal evaporation experiment and studied varation of hydrogen and oxygen isotope compositions in liquid-phase water and partiatly solid-phase,crystalline water during varius solt separating in the process of evaporation of sea water.Before that the degree of mineralization reaches 350g/L,the δD and δ18O increase synchronously with the degree of mineralization. In the terminal stage of crystallization of halite,when the degree of mineralization is 350g/L,the hydrogen and oxygen isotope compositions reach the maxima (δD=12.7‰,δ18O=35.7‰),and the volume of the remaining sea water is 3.35‰,that of the initial. Therafter,with the continued evaporation,the degree of mineralization continues to increase,while the δD and δ18O begin to fall. The δD and δ18O of crystalline water in solid minerals like gypsum,epsomite and carnallite gradually rise with the concetration of sea water, and the trend of rise remains when the δD and δ18O in liquid phase fall. It thus can be considered that at the time when the light isotopes are enriched relatively in remaining sea water,a part of heavy isotopes enter the crystalline water of minerals,and the socalled trend of selective evaporation may be crarfied. |
| SONG He-bin,LI Ya-wen.1994.Indoor evaporation experiment on water of south china sea[J].Acta Geoscientica Sinica,15(1,2):157-167. |
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