Geophysical evidence of a nearly dry bridgmanite in the Earth’s lower mantle [PDF]
Nature CommunicationsWater in Earth’s mantle plays a crucial role in shaping geological and geochemical processes. While previous electrical conductivity measurements on major mantle minerals have constrained water content in the Earth’s mantle down to the mantle transition ...
Yoshiyuki Okuda +7 more
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Temperature dependence of nitrogen solubility in bridgmanite and evolution of nitrogen storage capacity in the lower mantle [PDF]
Scientific Reports, 2023 Relative nitrogen abundance normalized by carbonaceous chondrites in the bulk silicate Earth appears to be depleted compared to other volatile elements.
Ko Fukuyama +7 more
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Crystal chemistry and compressibility of Fe0.5Mg0.5Al0.5Si0.5O3 and FeMg0.5Si0.5O3 silicate perovskites at pressures up to 95 GPa [PDF]
Frontiers in Chemistry, 2023 Silicate perovskite, with the mineral name bridgmanite, is the most abundant mineral in the Earth’s lower mantle. We investigated crystal structures and equations of state of two perovskite-type Fe3+-rich phases, FeMg0.5Si0.5O3 and Fe0.5Mg0.5Al0.5Si0.5O3,
Iuliia Koemets +10 more
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NanoSIMS analysis of water content in bridgmanite at the micron scale: An experimental approach to probe water in Earth’s deep mantle [PDF]
Frontiers in Chemistry, 2023 Water, in trace amounts, can greatly alter chemical and physical properties of mantle minerals and exert primary control on Earth’s dynamics. Quantifying how water is retained and distributed in Earth’s deep interior is essential to our understanding of ...
Ya-Nan Yang +13 more
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Pressure stabilizes ferrous iron in bridgmanite under hydrous deep lower mantle conditions [PDF]
Nature CommunicationsEarth’s lower mantle is a potential water reservoir. The physical and chemical properties of the region are in part controlled by the Fe3+/ΣFe ratio and total iron content in bridgmanite.
Li Zhang +7 more
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Role of garnet shaping the 660-km seismic discontinuity [PDF]
Nature CommunicationsThe 660-km discontinuity is commonly attributed to the post-spinel transition of ringwoodite to bridgmanite and ferropericlase, yet it does not fully explain observed structural complexity.
Takayuki Ishii +2 more
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Phase relations of bridgmanite, the most abundant mineral in the Earth’s lower mantle [PDF]
Communications ChemistryThe knowledge of phase relations of constitutive minerals is essential to investigate the structure, dynamics and evolution of the Earth and planetary interiors.
Tomoo Katsura
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Slab stagnation sustained by wet harzburgite and dry basaltic slab assemblages [PDF]
Nature CommunicationsSlab stagnation in the mantle transition zone is critical for the mantle dynamics and evolution of Earth’s interior but remains poorly understood. Here we present seismic images that show two key features near Eurasia’s northeastern margin: 1) a 700-km ...
Danian Shi +10 more
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Effect of bridgmanite-ferropericlase grain size evolution on Earth’s average mantle viscosity: implications for mantle convection in early and present-day Earth [PDF]
Progress in Earth and Planetary ScienceRecent experimental investigations of grain size evolution in bridgmanite-ferropericlase assemblages have suggested very slow growth for these bimodal phases.
Jyotirmoy Paul +5 more
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Double volcanic tracks at Hawaii caused by bridgmanite-enriched primordial mantle blobs [PDF]
Nature CommunicationsMantle plumes, rising from Earth’s deep interior, are expected to produce a single age-progressive hotspot track. However, Hawaiian volcanoes younger than ~7 million years form two subparallel volcanic chains, the Loa and Kea trends. The mechanism behind
Hao Liu +5 more
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