Experimental observation of deep crust fluid-NaCl aqueous solution at elevated temperatures and pressures and its significance

查看全文 作　　者：Ronghua [1]Zhang;Shumin [1]Hu

机构地区：[1]Chinese Acad Geol Sci, Open Res Lab Geochem Kinet, Beijing 100037, Peoples R China

出　　处：《Chinese Science Bulletin》索引1999年第44卷第7期,共7页

摘　　要：In order to reveal the nature of deep crust fluids, the phase relations of NaCI-saturated solution at high temperatures and pressures in a hydrothermal diamond anvil cell (HDAC)are investigated. Salinity of the solutions observed is about 35%—50%. The temperatures for the observation range from 25 to 850℃ and the pressures from 1 atm to about 1 GPa. A supercritical single phase, liquid phase (L), vapor phase (V), solid phase (H), L + H, H + V + L and the near-critical phases L + V can be observed. A two-phase (L + V) immiscibility field for the NaCI solution has been discovered to lie in a wide range of temperatures and pressures:from 250( ± 3) to 721℃. Within this field there are two parts, where the upper high temperature part of the two-phase regions is very unstable in character. It is possible to observe a 'critical phenomenon'. In some of our experiments an 'explosion' almost constantly occurred at the interface between the liquid and vapor phases, making the interface obscure, and a 关键词：TWO-PHASE IMMISCIBILITY CRITICAL phenomenon solution structure.

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Experimental observation of deep crust fluid-NaCl aqueous solution at elevated temperatures and pressures and its significance

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