Hitomi Nakamura's research while affiliated with National Institute of Advanced Industrial Science and Technology and other places
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Publications (6)
Geochemical and geophysical observations for large-scale structures in the Earth’s interior, particularly horizontal variations of long wavelengths such as degree-1 and degree-2 structures, are reviewed with special attention to the cause of hemispherical mantle structure. Seismic velocity, electrical conductivity, and basalt geochemistry are used...
Deep-sea sediments highly enriched in rare-earth elements (REE), termed “REE-rich mud,” have recently attracted attention as a potential mineral resource for industrially critical metals. Biogenic apatite or fish teeth and bone debris comprises the mineral phase which primarily hosts REE in deep-sea sediments; thus, biogenic apatite is a key materi...
Compositional variability found in modern mid-ocean ridge basalt (MORB) and ocean island basalt (OIB) reflects differentiation processes associated with material recycling in the mantle-crust system. To investigate the timing at which this recycling system was established and how it transformed into the present-day system, we present geochemical an...
A total of one to ten ocean masses of water (including H2O, OH, H in gas, liquid, and solid phases) is probably stored in the Earth's crust-mantle system as a variety of forms and components. Of these, the liquid phase involves aqueous solution, hydrous melt, and supercritical fluid, which may change composition continuously from a diluted aqueous...
Citations
... Bioapatites, consisting of broken fragments and teeth of marine creatures, have grain lengths ranging from 50 μm to 500 μm (Kon et 2021; Sa et al., 2018;Liao et al., 2022). The broken fragments and teeth are mainly composed of nanosized hydroxyapatite crystals interwoven with matrix proteins such as collagen (Elliott, 2002;Boskey, 2007;Liao et al., 2019aLiao et al., , 2022Yasukawa et al., 2022). The ΣREY of the studied bioapatites decreased significantly from the root to the tip (varying from 10 4 μg/g to 10 2 μg/g) within the well-preserved teeth (Fig. 8), which reveals the spatial heterogeneity of REYs distribution in the fossil grains. ...
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... While this specific nitrogen isotope fractionation pathway described in this study can so far not be linked to the existing δ 15 N record from the Archean as evidence of hydrothermal processes is lacking for sites with unusual δ 15 N enrichments, other formations, for instance the Dresser formation, Pilbara Craton, show evidence of surficial hydrothermal features including geyserite, sinter terracettes and mineralized remnants of hot spring pools/vents 54 and may prove to have recorded these processes. However, it should be noted origins of features in this formation are still under debate and could be remnants of deep-sea hydrothermal systems 55,56 . While the 15 N rock record data from the Archean is limited, this eon was affected by widespread volcanism and the associated hydrothermal systems interacting with N enriched lithified sediments could have produced a setting prime for water-air flux of bioavailable N to the Archean atmosphere. ...
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... The amounts and distributions of fluids, as well as thermal structure, are another key to determining material properties of the lithosphere. Iwamori et al. (2019) comprehensively review the chemical form, compositions, quantities, and distribution of fluids from global to local scales, and explain the roles of circulating fluids in geodynamic processes in subduction zones. This paper also shows mechanical and chemical effects of fluids on seismicity and localized crustal deformation captured by geophysical and geochemical observations. ...
