A study on paleo-sea water and paleo-atmosphere through the analysis of fluid inclusions in halites

在该项目的三年期限内，提供了一台由高热玻璃制成的带有冰冷手指的真空球磨机。使用该球磨机后，盐岩卤水抽提水的D/H和180/160分析结果比以前更加可靠。在此基础上进行了技术改进，取得了以下地球化学成果：1)盐岩。通过D/H和180/160比值与死海卤水的比较，证实了以色列的侏罗纪盐岩与死海卤水发生了重结晶；2)根据加利福尼亚州赛尔斯湖不同层位盐岩中卤水的同位素分析，讨论了死亡谷区近2 Ma以来的气候变化；3)摩洛哥近海侏罗纪盐岩形成后可能受到大气降水环境的影响。1)应用H_2-H_2O平衡法测定卤水的D/H活度比；2)用共沸蒸馏测定D/H浓度比(与以色列J.Gat公司合作)；3)微量卤水的化学分析(与美国H.D.Holland公司合作)；

During the three-year term of this project, a vacuum ball-mill made of Pyrex glass with a cold finger was made available. By the use of this ball-mill, results on D/H and 180/160 analyses for the extracted water from brine included in halites became more reliable than before. Based on this technical improvements, following geochemical results were obtained; 1) halite of Mt. Sedom Israel, is interperted to be recrystallized with extraneous water by the comparison of D/H and 180/160 ratios with those of Dead Sea brines, 2) the climatic changes during the last 2 Ma is discussed for the Death Valley area, based on the isotopic analyses of brines in halites of various horizons of Searles Lake, California, and 3) Jurassic halites in marine sediments off Morocco is possible to be subjected to meteoric water environments after their formation.As fundamental contributions to the fluid inclusion study from this project, following results are accomplished; 1) D/H activity ratio determination of brines by the application of H_2 - H_2O equilibrium method, 2) D/H concentration ratio determination by an azeotropic distillation (with J. Gat, Israel), 3) chemical analysis of microquantity of brine (with H.D. Holland, U.S.A.),and 4) determination of D/H fractionation factors in hydrate salt - brine systems.