2019年12月
Temperature-induced amorphization in CaCO3 at high pressure and implications for recycled CaCO3 in subduction zones
Nature Communications
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- 巻
- 10
- 号
- 1
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/s41467-019-09742-5
- 出版者・発行元
- Springer Science and Business Media {LLC}
Calcium carbonate (CaCO 3 ) significantly affects the properties of upper mantle and plays a key role in deep carbon recycling. However, its phase relations above 3 GPa and 1000 K are controversial. Here we report a reversible temperature-induced aragonite-amorphization transition in CaCO 3 at 3.9–7.5 GPa and temperature above 1000 K. Amorphous CaCO 3 shares a similar structure as liquid CaCO 3 but with much larger C-O and Ca-Ca bond lengths, indicating a lower density and a mechanism of lattice collapse for the temperature-induced amorphous phase. The less dense amorphous phase compared with the liquid provides an explanation for the observed CaCO 3 melting curve overturn at about 6 GPa. Amorphous CaCO 3 is stable at subduction zone conditions and could aid the recycling of carbon to the surface.
- リンク情報
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- DOI
- https://doi.org/10.1038/s41467-019-09742-5
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/31036817
- URL
- http://orcid.org/0000-0001-5916-7524
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85065063944&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85065063944&origin=inward
- ID情報
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- DOI : 10.1038/s41467-019-09742-5
- eISSN : 2041-1723
- ORCIDのPut Code : 56884814
- PubMed ID : 31036817
- SCOPUS ID : 85065063944