DOI: 10.1016/j.epsl.2019.115959
论文题名: Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions
作者: Li Z. ; Stackhouse S.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2020
卷: 531 语种: 英语
英文关键词: carbonate
; first-principles
; mantle
Scopus关键词: Calculations
; Carbon
; Carbonates
; Carbonation
; Climate change
; Density functional theory
; Earth (planet)
; Entropy
; First principles
; Geological process
; Global carbon cycle
; High temperature phase stability
; Lower mantle condition
; Magnetic entropy
; mantle
; Tetrahedral coordination
; Iron compounds
英文摘要: Constraining the flux of carbon in and out of the interior of the Earth due to long-term geological processes is important, because of the influence that it has on climate change. On timescales of billions of years, host minerals such as carbonate phases could play a significant role in the global carbon cycle, transporting carbon into the lower mantle as a component of subducting slabs. We use density functional theory based calculations to study the high-pressure, high-temperature phase stability of Mg1-xFexCO3. Our results show that iron-rich phases, where carbon is in tetrahedral coordination, are only stable at lower mantle conditions due to their magnetic entropy, which is also responsible for the unusual shape of their phase boundary. Low-pressure carbonate phases are found to be highly anisotropic, but high-pressure carbonate phases are not, which has important implications for their seismic detectability. Our work confirms that future discussions of the global carbon cycle should include the deep Earth. © 2019 The Authors Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159584
Appears in Collections: 气候变化与战略
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作者单位: School of Earth and Environment, University of LeedsLS2 9JT, United Kingdom
Recommended Citation:
Li Z.,Stackhouse S.. Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions[J]. Earth and Planetary Science Letters,2020-01-01,531