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

Testing Mineralogical Models of the Mantle Transition Zone Using Seismic Data

使用地震数据测试地幔过渡带的矿物学模型

基本信息

批准号：
0439978
负责人：
Lianxing Wen
金额：
$ 17.23万
依托单位：
SUNY at Stony Brook
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2005
资助国家：
美国
起止时间：
2005-04-15 至 2008-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0439978&HistoricalAwards=false
关键词：
Testing Mineralogical Models Mantle Transition

项目摘要

Mantle composition plays an essential role in understandingevolution, mantle dynamics and phase transitions of the Earth'smantle. With increasing amounts of experimental data, chemicalinteractions of various phases can be explored between differentsubsystems, and seismic velocity and density profiles can becalculated based on compositional models. The ability toquantitatively calculate seismic profiles based on compositionalmodels makes it possible for compositional models to be directlytested and constrained using seismic data. The investigators willperform a joint modeling of seismic and mineral physics data toconstrain compositional and thermal models in the Earth'stransition zone. The collaborative research also investigatesregional variation of seismic structures, as well as its cause,using seismic data sampling various tectonic regions. The intellectualmerits of the collaborative research include quantitative andintegrative studies of seismic structures, wave propagation,mantle composition and mantle mineralogy in the Earth's transitionzone. This research has broad impacts on training ofa graduate student in both seismology and mineral physics, andproviding seismically-constrained compositional and thermal modelswhich would serve as a basis for a quantitative understanding ofthe effects of mantle mineralogy on the dynamics of the descendingslabs and ascending mantle plumes, and for a quantitative linkbetween seismic velocity perturbations, mantle temperature,and density buoyancy in large-scale geodynamical modeling.

地幔成分对于认识地幔演化、地幔动力学和地幔相变具有重要作用。随着实验数据的不断增加，可以探索不同子系统之间各相的化学相互作用，并可以基于组分模型计算地震速度和密度剖面。基于组分模型定量计算地震剖面的能力使得组分模型可以直接用地震数据进行检验和约束。研究人员将对地震和矿物物理数据进行联合建模，以约束地球过渡带的成分和热模型。这项合作研究还利用对各个构造区域进行采样的地震数据，调查了地震构造的区域变化及其原因。合作研究的智力优势包括对地球过渡带的地震构造、波传播、地幔成分和地幔矿物学进行定量和综合研究。这项研究对培养地震学和矿物物理学的研究生具有广泛的影响，并提供了地震约束的成分和热模型，这将作为定量了解地幔矿物学对下降板块和上升地幔柱动力学的影响的基础，以及在大规模地球动力学模拟中地震速度扰动，地幔温度和密度浮力之间的定量联系。