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Theoretical studies on the hydrous lower mantle and D″ layer minerals
Jiajun Jiang;Feiwu Zhang
2019
Source PublicationEarth and Planetary Science Letters
Volume525Pages:1-12
Abstract

The incorporation mechanisms and elastic properties of hydrous Bridgmanite (Brg) and post-Perovskite (PPv) are investigated by using first principles calculations at the lower mantle pressures. The elastic properties calculations in both (Al, Fe)-free and (Al, Fe)-bearing systems give evidences that hydrogen has less effect on the elastic wave velocities and moduli in (Al, Fe)-free and Al-bearing system. However, the elastic wave velocities and moduli, especially the shear velocity V S and the shear modulus G, are remarkably sensitive to the presence of hydrogen in the Fe-bearing system. The calculated shear velocity anomaly (dV S ) are −2.9% for Fe3+SiH-Brg and −3.1% for Fe3+SiH-PPv, which are very close to the average anomaly value of LLSVPs. This result may imply the Ferric-bearing hydrous MgSiO3 is likely a dominated mineral in LLSVPs. Density functional perturbation theory (DFPT) and QHA calculation have also been performed to determine the P–T phase diagram for different hydrous systems. The phase transition boundary between Brg and PPv shifts to higher or lower pressures when the hydrogen atom substitutes in the Mg or Si sites in the lattice, respectively. The existence of volatiles such as hydrogen may account for the strong lateral chemical heterogeneity in lowermost mantle.

KeywordHydrogen bridgmanite post-perovskite phase Transition elasticity Property first-principal
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/10610
Collection矿床地球化学国家重点实验室
Affiliation1.State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China
2.University of Chinese Academy of Sciences, Beijing 100049, China
Recommended Citation
GB/T 7714
Jiajun Jiang;Feiwu Zhang. Theoretical studies on the hydrous lower mantle and D″ layer minerals[J]. Earth and Planetary Science Letters,2019,525:1-12.
APA Jiajun Jiang;Feiwu Zhang.(2019).Theoretical studies on the hydrous lower mantle and D″ layer minerals.Earth and Planetary Science Letters,525,1-12.
MLA Jiajun Jiang;Feiwu Zhang."Theoretical studies on the hydrous lower mantle and D″ layer minerals".Earth and Planetary Science Letters 525(2019):1-12.
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