权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

The Thermodynamics, Fluid Dynamics and Chemistry of Deep Mantle Melts: Models of Archean Magmatism

深部地幔熔体的热力学、流体动力学和化学：太古代岩浆作用模型

基本信息

批准号：
9614178
负责人：
David Sparks
金额：
$ 14.52万
依托单位：
Columbia University
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1997
资助国家：
美国
起止时间：
1997-06-01 至 1999-10-26
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9614178&HistoricalAwards=false
关键词：
Thermodynamics Fluid Dynamics Chemistry Deep

项目摘要

9614178 Sparks Komatiite lavas, with extremely high eruption temperature provide unique information about the Archean mantle. Simple models of the major element compositions of Archean komatiites indicate melting at very high temperatures and pressures (potential temperatures greater than 1800C and depths of at least 250 km), but the dynamics of upwelling, melting and melt extraction in these areas of the mantle are not understood. The PI proposes to integrate a numerical model of mantle convection and melting with parameterizations of melt compositions from high pressure melting experiments. These models will be used to systematically explore the effects of poorly constrained properties of and conditions in the Archean mantle (temperature, composition, viscosity, melt migration permeability, lithospheric thickness) on the major and trace element composition of the melts that are produced. The compositions of ultramafics and other Archean rocks will be used to constrain the hypotheses and assumptions of the models. A flexible and efficient model that can determine the dependencies and interactions between the fluid dynamics and chemistry of mantle melting will provide both insight into the dynamics of the Archean mantle and guidance in setting the priorities of future experimental programs.

小行星9614178 具有极高喷发温度的科马提岩为研究太古代地幔提供了独特的信息。太古代科马提岩的主要元素组成的简单模型表明，熔融在非常高的温度和压力（潜在温度大于1800 ℃，深度至少250公里），但在地幔的这些地区的上涌，熔融和熔体提取的动力学还不清楚。 PI建议将地幔对流和熔融的数值模型与高压熔融实验中的熔融成分参数化相结合。这些模型将被用来系统地探讨太古代地幔的约束性能和条件（温度，成分，粘度，熔体迁移渗透性，岩石圈厚度）的主要和微量元素组成的熔体上的影响。超镁铁岩和其他太古代岩石的成分将被用来约束模型的假设和假设。一个灵活而有效的模型，可以确定地幔熔融的流体动力学和化学之间的依赖关系和相互作用，将提供深入了解太古代地幔的动力学和指导，在设定未来的实验计划的优先事项。