0.21～4.18GPa和20～350℃下H_2O的电导率研究
摘要
在0.21～4.18GPa和20～350℃下测量了固相和液相H_2O的电导率.结果表明:(1)不同的团相H_2O具有不同的电导率与温度压力关系.电导率与温度的关系是连续的,但是在2.11GPa与2.58GPa压力之间存在着不连续现象,这与相应压力下的冰_Ⅵ和冰_Ⅶ是对应的;(2)液态H_2O的电导率均随温度和压力的增高而增大,但随压力的不同分别在0.57GPa与0.9GPa和2.11GPa与2.58GPa压力之间存在着突变(不连续),其不连续的压力值与固态H_2O的同质多型(冰_Ⅴ、冰_Ⅵ和冰_Ⅶ)转变压力一致,这反映不同压力条件下液态H_2O具有非常不同的电化学性质.水的这种电导率性质可能是造成下地壳存在高导层和上地幔存在地震波低速层的重要原因.
引文
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[2]Hyndman R D,Vanyan L L,Marquis G,et al.The origin of electrically conductive lower continental crust:saline water or graghite?Phys Earth Planet Int,1993,81:325～344
[3]Holzapfel W B.Effect of pressure and temperature on the conductivity and ionic dissociation of water up to 10 kbar and 1000℃.J Chem Phys.1969,50:4424～4428
[4]Marshall W L,Franck E U.Ion product of water substance at 0～1000℃,1～10000 bars,new intemational formulalion and its background.Phys Chem Ref Data,1981,10:295～304
[5]Tanger J C,Pitzer K S.Calculation of the ionization constant of H_2O to 2273 K and 500 MPa.AICHE J,1989,35:1631～1638
[6]Eberz A,Franck E U.High pressure electrolyte conductivity of the homogeneous,fluid water-sodium hydroxide system to 400℃ and 300 bar.Berichte der Bunsengesellschaft fur Physikalische Chemie.1995.99(9):1091～1103
[7]Ho P C,Palmer D A,Mesmer R E.Electrical condactivity measurements of aqueous sodium chloride solutions to 600℃ and 300 MPa.Journal of Solution Chemistry,1994,23(9):997～1018
[8]徐有生,谢鸿森,郭捷,等.0.4～5.0 GPa和室温～500℃下NaCl溶液的电导率.中国科学,D辑,1997(待发表)
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[12]万明浩,秦顺亭,起风梧,等.岩石物理性质及其在石油勘探中的应用.北京:地质出版社,1994.145～148
[13]吴其斌,张肇元.全球地学大断面计划.北京:地震出版社,1991.25～39
[14]郑海飞,谢鸿森,徐有生,等.高温高压下含水矿物对岩石熔点影响的实验研究.地质学报,1995.69(4):326～335
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