Continued Experimental Studies of Mantle Melting

地幔熔化的持续实验研究

• 批准号: 9804913
• 负责人: A. Dana Johnston
• 金额: $ 9.6万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-07-15 至 2000-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9804913&HistoricalAwards=false
• 关键词: Continued; Experimental; Studies; Mantle; Melting

9804913JohnstonIn this continuation of an earlier project (EAR-9506045) at 10 kbar pressure, we will study experimentally the melting systematics of the Earth's mantle at 20 kbar pressure, using natural minerals as starting materials and layers of vitreous carbon spheres as a melt sinks within our graphite-lined Pt capsules. Our goal is to assess the effects of variable mode and compositional fertility on the solidus temperatures of different types of mantle, the near-solidus melt compositions, and the rates of melt productivity with increasing temperature. We will study eight starting materials constructed from hand-picked mineral separates: four from a fertile spinel lherzolite xenolith and four others from an compositionally intermediate spinel lherzolite. Modes will approximate "average" mantle, and mantle that is enriched in clinopyroxene, orthopyroxene, or Cr-spinel.

9804913约翰斯顿在10千巴压力下的早期项目（1006045）的继续中，我们将实验研究20千巴压力下地幔的熔融系统学，使用天然矿物作为起始材料，玻璃碳球层作为熔融物在我们的石墨衬里的Pt胶囊中下沉。我们的目标是评估可变模式和组成的肥力上的固相线温度的不同类型的地幔，近固相线熔体组合物，和熔体生产率随温度升高的影响。我们将研究八个起始材料建造的手挑选的矿物分离：四个从肥沃的尖晶石二辉橄榄岩捕虏体和其他四个从组成中间尖晶石二辉橄榄岩。模式将近似于“平均”地幔，以及富含单斜辉石、斜方辉石或铬尖晶石的地幔。