High Pressure Phase Equilibrium Studies Bearing on the Generation and Crystallization of Basaltic Magmas

玄武质岩浆生成和结晶的高压相平衡研究

• 批准号: 8816044
• 负责人: Dean Presnall
• 金额: $ 49.43万
• 依托单位: University of Texas at Dallas
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-04-01 至 1994-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8816044&HistoricalAwards=false
• 关键词: Pressure; Phase; Equilibrium; Studies; Bearing

The long-term objective of this research program, which has remained the same over the years, is to develop a systemically collected body of phase equilibrium data that imposes progressively tighter constraints on the origin of basalt and the formation of the earth's crust from the mantle. In order to generalize results and to develop a more comprehensive body of data in an important pressure range, it is proposed to determine, using a piston-cylinder apparatus, the phase relationships at 15, 25, and 30 kbar and the effect of Na2O on melting relationships. The data would provide new constraints on (1) the origin of primary mid-ocean ridge basalts, (2) the composition, depth of generation, and percent melting of primary tholeiitic magmas in the Hawaiian Islands, and (3) the origin of high-alumina basalts in subduction zones. In addition, it is proposed to study melting relations in the system Mg2SiO4-SiO2 up to pressures of 250 kbar using an MA-8 apparatus at the University of Alberta. This study would bear on very high pressure magmatic processes in the early history of the earth.

这项研究计划的长期目标是， 多年来一直保持不变，是发展一个 系统地收集相平衡数据， 对原产地的限制越来越严格， 玄武岩和地壳的形成 地幔 为了推广结果并发展一个更 在一个重要的压力范围内的综合数据体，它 提出了确定，使用活塞缸装置， 在15、25和30 kbar时的相位关系以及 Na 2 O的熔融关系。 这些数据将提供新的 对（1）原始洋中脊起源的限制 玄武岩;（2）成分、生成深度; 夏威夷原始拉斑玄武岩岩浆的熔融百分比 岛礁高铝玄武岩的成因 俯冲带 此外，建议研究 Mg_2SiO_4-SiO_2系统的加压熔化关系 使用MA-8设备在250 kbar的压力下， 阿尔伯塔。 这项研究将承受很大的压力 地球早期历史上的岩浆作用