DOI: 10.1002/grl.50875
论文题名: First principles prediction of a new high-pressure phase of dense hydrous magnesium silicates in the lower mantle
作者: Tsuchiya J.
刊名: Geophysical Research Letters
ISSN: 0094-8621
EISSN: 1944-8352
出版年: 2013
卷: 40, 期: 17 起始页码: 4570
结束页码: 4573
语种: 英语
英文关键词: DHMS
; first principles calculation
; high pressure
; hydrous minerals
; phase transition
Scopus关键词: Dense hydrous magnesium silicates
; DHMS
; First-principles calculation
; High pressure
; High-pressure phase transitions
; Hydrous mineral
; Lower mantle condition
; Monoclinic symmetry
; Ice
; Phase transitions
; Slope stability
; Structural geology
; crystal structure
; high pressure
; lower mantle
; magnesium
; perovskite
; phase transition
; stishovite
英文摘要: First principles calculations have shown that the high-pressure phase transition of phase D MgSi2O6H2 to the new high-pressure hydrous phase MgSiO4H2 plus stishovite occurs at about 40 GPa. The crystal structure of the new phase is very similar to that of CaCl2-type SiO2 and has monoclinic symmetry with space group P2/m. This new hydrous phase is stable up to about 52 GPa and then dissociates into MgSiO3 perovskite and H2O (ice VIII) at static 0 K conditions. The Clapeyron slope between phase D and the new phase + SiO2 is positive; about 6.4 MPa/K at 1000 K. This new hydrous phase further extends the stability field of dense hydrous magnesium silicates and also opens the pathway toward the existence of a high-pressure phase of ice at the lower mantle conditions. Key Points High pressure phase of phase D has been predicted This new phase dissociate into PV and H2O at higher pressure conditions There is a possibility of the existence of high pressure ice in the Earth ©2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84883465672&doi=10.1002%2fgrl.50875&partnerID=40&md5=3bbb60043280a7c7df05044c1467b3aa
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5885
Appears in Collections: 气候减缓与适应
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作者单位: Geodynamics Research Center, Ehime University, 2-5 Bunkyo-cho, Matsuyama, Ehime 790-8577, Japan
Recommended Citation:
Tsuchiya J.. First principles prediction of a new high-pressure phase of dense hydrous magnesium silicates in the lower mantle[J]. Geophysical Research Letters,2013-01-01,40(17).