| 地核物质成分研究进展 |
| |
| 引用本文： | 张友联,杜建国,崔月菊.地核物质成分研究进展[J].地球科学进展,2011,26(4):365-374. |
| |
| 作者姓名： | 张友联 杜建国 崔月菊 |
| |
| 作者单位： | 张友联,Zhang Youlian(地震出版社,北京,100081);杜建国,崔月菊,Du Jianguo,Cui Yueju(中国地震局地震预测研究所,北京,100036) |
| |
| 基金项目： | 国家自然科学基金面上项目 |
| |
| 摘 要： | 系统介绍了地核的形成时间、地核的物理特性、化学成分和物质存在相态.利用W-Hf同位素系测年方法厘定地核与地幔分异的年龄是在地球形成的最初30 Ma.但是,内核的结晶年龄还是未知的.地核声波速度的各向异性可能是六面体紧密堆积(hcp)相铁的C轴方向沿地球轴线优选定向排列引起的.利用地球物理资料估算的地核密度与响应温压条件...
|
| 关 键 词： | 地核 密度 化学成分 相 声波速度各向异性 |
Advances in Studying the Composition of the Earth's Core |
| |
| Zhang Youlian,Du Jianguo,Cui Yueju.Advances in Studying the Composition of the Earth's Core[J].Advance in Earth Sciences,2011,26(4):365-374. |
| |
| Authors: | Zhang Youlian Du Jianguo Cui Yueju |
| |
| Institution: | Zhang Youlian1,Du Jianguo2,Cui Yueju2(1.Seismological Press,Beijing 100081,China,2.Institute of Earthquake Science,CEA,Beijing 100036,China) |
| |
| Abstract: | The age,physical properties and chemical compositions of the Earth’s core are reviewed.The formation time of the core and mantle is determined by W-Hf isotope dating to be 30 Ma at the beginning of the earth formation.However,the time of the inner core crystallization from the liquid core remains an open question.The inner core is anisotropic in elastic wave velocity,which is considered as a result of the c axis of hcp-structure iron arranged predominantly along the Earth′s pole axis.The density difference of the core between the PREM model and liquid iron at the core temperature and pressure is about 10%,which indicates that the core contains light elements,such as C,S,P,Si,O,H,Mg,etc.The light elements in the core may play an important role in the formation of D″ layer between the core and mantle,formation and evolution of the plume and activities of volcano and earthquake,which is the new field for us to investigate. |
| |
| Keywords: | The core Density Chemical composition Phase Anisotropy |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
