Publication Date:
2006-04-29
Description:
The boundary layer between the crystalline silicate lower mantle and the liquid iron core contains regions with ultralow seismic velocities. Such low compressional and shear wave velocities and high Poisson's ratio are also observed experimentally in post-perovskite silicate phase containing up to 40 mol% FeSiO3 endmember. The iron-rich post-perovskite silicate is stable at the pressure-temperature and chemical environment of the core-mantle boundary and can be formed by core-mantle reaction. Mantle dynamics may lead to further accumulation of this material into the ultralow-velocity patches that are observable by seismology.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mao, Wendy L -- Mao, Ho-Kwang -- Sturhahn, Wolfgang -- Zhao, Jiyong -- Prakapenka, Vitali B -- Meng, Yue -- Shu, Jinfu -- Fei, Yingwei -- Hemley, Russell J -- New York, N.Y. -- Science. 2006 Apr 28;312(5773):564-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lujan Neutron Scattering Center, Los Alamos National Laboratory, Los Alamos, NM 87545, USA. wmao@lanl.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16645091" target="_blank"〉PubMed〈/a〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
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Chemistry and Pharmacology
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Computer Science
,
Medicine
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Natural Sciences in General
,
Physics
