Experimental Trace Element Geochemistry

实验微量元素地球化学

• 批准号: 9003951
• 负责人: Michael Drake
• 金额: $ 27.07万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1990
• 资助国家: 美国
• 起止时间: 1990-07-15 至 1993-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9003951&HistoricalAwards=false
• 关键词: Experimental; Trace; Element; Geochemistry

This program involves experimental studies of the partitioning of siderophile and other elements between lithophile phases and silicate melts at pressures varying from 1 bar to in excess of 200 kbars and temperatures varying from 1300oC to in excess of 2300oC. Knowledge of these partition coefficients is essential to the interpretation of elemental systematics in the mantle and mantle- derived materials and specifically bears on the question of the early differentiation of the Earth. These experiments also bear directly on the thermodynamics and economic geology of the platinum group elements (PGE). During the next award period, the P.I.'s (i) continue ultrahigh pressure experiments between olivine/melt, majorite/melt, and Mg- perovskite/melt phase pairs, including ultrahigh pressure reversal experiments; (ii) continue the systematic study of noble melt solubilities in silicate melts and partitioning between coexisting phases as functions of intensive variables; and (iii) conduct experiments investigating the partitioning of Ga and Ge between garnet/melt and clinopyroxene/melt pairs. The results f the experiments will be applied to understanding the early thermal history and differentiation of the Earth and to the thermodynamics and economic geology of the PGE.

该计划涉及的实验研究， 亲铁体和其它元素的分配 亲石相和硅酸盐熔体之间的关系， 压力从1巴变化到超过200千巴， 温度从1300摄氏度到超过2300摄氏度不等。 这些分配系数的知识是必不可少的 地幔和地幔中元素系统学的解释 衍生材料，特别是对问题的影响， 地球的早期分化 这些实验还表明， 直接研究热力学和经济地质学 铂族元素（PGE）。 在下一个奖励期间，P.I. s（i）继续 橄榄石/熔体、镁橄榄石/熔体和Mg- 钙钛矿/熔体相对，包括超压 （二）继续系统研究noble 硅酸盐熔体中的熔体溶解度和 共存阶段作为密集变量的函数;以及（iii） 进行实验研究Ga和Ge的分配 石榴石/熔体和单斜辉石/熔体对之间。 结果F 这些实验将用于了解早期的 地球的热历史和分异， 铂族元素的热力学和经济地质学。