气候变化领域集成服务门户(CCPortal): Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions

CCPortal

DOI	10.1016/j.epsl.2019.115959
	Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions
	Li Z.; Stackhouse S.
发表日期	2020
ISSN	0012821X
卷号	531
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
关键词	carbonate first-principles mantle
英文关键词	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
语种	英语
来源期刊	Earth and Planetary Science Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/202733
作者单位	School of Earth and Environment, University of LeedsLS2 9JT, United Kingdom
推荐引用方式 GB/T 7714	Li Z.,Stackhouse S.. Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions[J],2020,531.
APA	Li Z.,&Stackhouse S..(2020).Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions.Earth and Planetary Science Letters,531.
MLA	Li Z.,et al."Iron-rich carbonates stabilized by magnetic entropy at lower mantle conditions".Earth and Planetary Science Letters 531(2020).