Redox-Induced Destabilization of Dolomite at Earth’s Mantle Transition Zone

Autor:	Shan Qin, Shengxuan Huang, Jingjing Niu, Yu Gong, Tianlei Zhai
Rok vydání:	2021
Předmět:	Dolomite Diamond chemistry.chemical_element engineering.material Redox Diamond anvil cell chemistry Chemical physics Transition zone engineering General Earth and Planetary Sciences Graphite Ferropericlase Carbon Geology
Zdroj:	Journal of Earth Science. 32:880-886
ISSN:	1867-111X 1674-487X
DOI:	10.1007/s12583-021-1410-6
Popis:	Carbonates are considered to be important hosts of oxidized carbon during subduction processes. Here we investigate the redox interactions between dolomite and metallic iron in laser-heated diamond anvil cells up to ∼20 GPa. The identification of recovered samples via in-situ synchrotron X-ray diffraction and ex-situ Raman spectroscopy shows that the reaction occurs with the formation of ferropericlase, graphite and hexagonal diamond, while CaCO3 remains stable. The experimental results indicate dolomite and metallic iron phases cannot coexist and demonstrate a possible formation mechanism of ultradeep diamonds via redox reaction between dolomite and iron under the mantle transition zone conditions. The results are significant for understanding carbon transportation during subduction processes and have further implications to the processes in the more complex systems regarding to carbonate-silicate-metal phase relations.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e6a8065e5b57d60c0f18224a780a3916 https://doi.org/10.1007/s12583-021-1410-6 Zobrazit plný text záznamu Full text from SpringerLink