下地: 1.(到田地里去) go to the fields 短语和例子下地劳动 go to work in the fields2.(下病床) leave a sickbed 短语和例子这孩子病好多了, 已经可以下地了。 the child is getting much better now and is up and about again
Structure of lower mantle and core - mantle boundary region and its geodynamics 下地幔及核幔边界结构及地球动力学
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This is the key problem for the constraint on the possible composition of lower mantle 这一问题的研究对确定下地幔真实的矿物学组成有十分关键的影响。
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High - mg volcanic rocks approach the primitive mantle compositions , and their magmatic source is close to the composition of bse , derives from the lower mantle and formed by this type - mantle rocks " fractional melting highly ( > 25 % ) . high - mg volcanic magma , formed in the axis of the emei mantle plume , underwent the crystallization differentiation of olivines and some pyroxenes ; some olivines reflect fair cumulus crystallization 高镁火山岩接近于原始岩浆的组成，岩浆源区与地球平均成分bse的成分特征相近，起源深度为下地幔，为该地幔岩较高程度的部分熔融( 25 )而形成的。高镁火山岩处于地幔柱的轴部，经历了橄榄石及一定程度的辉石分异结晶，并且橄榄石显示出一定的堆晶作用。
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Shock wave compression technique has play an important role in the understanding of the material composition thermodynamic state and physical properties of the earth ' s ulterior . in this article , the stabling of high - pressure phase of one of the main candidate materials of the earth ' s lower mantle ? enstatite ( mg0 . 92 , fe0 . 08 ) sio3 were investigated through the experimented measurement of hugoniot equation of state , and together with thermodynamic calculation and analysis 本学位论文以冲击压缩技术为手段，从测量其hugoniot物态方程入手，结合高压物理和热力学理论分析，较深入地研究了下地幔中的一种主要候选组分顽火辉石( mg _ ( 0 . 92 ) ， fe _ ( 0 . 08 ) ) sio _ 3在与下地幔大致相当的温度压力条件下的相态-钙钛矿型结构的相稳定性。
