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

作     者：Ronghua Zhang Shumin Hu 

作者机构：Chinese Acad Geol Sci Open Res Lab Geochem Kinet Beijing 100037 Peoples R China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：1999年第44卷第7期

页      面：654-660页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：Ministry of Geology and Mineral Resources National Satural Science Foundation of China, (2%73008) State Science and Technology Commission of China, (95-Pre-39) 

主　　题：two-phase immiscibility critical phenomenon solution structure. 

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