Experimental studies on plastic deformation of the lower mantle materials

GSTDTAP

项目编号	1520006
	Experimental studies on plastic deformation of the lower mantle materials
	Shun-ichiro Karato
主持机构	Yale University
项目开始年	2015
	2015-12-01
项目结束日期	2018-11-30
资助机构	US-NSF
项目类别	Continuing grant
项目经费	131502(USD)
国家	美国
语种	英语
英文摘要	In this project, the PI team will study the plastic flow behavior of materials in the lower mantle of the Earth that occupies a large fraction of Earth between the upper mantle and the core. Plastic deformation in this region is an important mechanism of cooling of Earth and it also controls the way in which materials are stirred or mixed. The experimental studies on plastic deformation under the conditions of the lower mantle have been difficult due to the difficulties in generating and measuring stress and strain under these conditions. The team has made various modifications to the deformation apparatus that was developed in their lab to conduct these deformation experiments. The results will provide the first data set to understand the whole Earth thermal and chemical history. Rheological properties of the lower mantle will be investigated using a rotational Drickamer apparatus developed in in the PI's laboratory. This apparatus, after numerous modifications, now allows his team to conduct large strain quantitative deformation experiments (to strain ~100-300%) under shallow lower mantle conditions (P to 28 GPa, T to 2200 K) providing the quantitative results on rheological behavior under these conditions. Not only the flow laws of each mineral, but also the microstructural evolution will be studied to provide the mechanisms of deformation and the nature of lattice-preferred orientation that can be used to interpret seismic anisotropy.
来源学科分类	Geosciences - Earth Sciences
文献类型	项目
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/68987
专题	环境与发展全球科技态势
推荐引用方式 GB/T 7714	Shun-ichiro Karato.Experimental studies on plastic deformation of the lower mantle materials.2015.