Tetsu Kogiso
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View article: Stable carbon and oxygen isotope signatures of mantle-derived calcite in Aitutaki lherzolite xenolith: Implications for organic carbon cycle in the oceanic mantle
Stable carbon and oxygen isotope signatures of mantle-derived calcite in Aitutaki lherzolite xenolith: Implications for organic carbon cycle in the oceanic mantle Open
Carbon isotope data is desired to be increased to promote the understanding of carbon cycle throughout in the Earth. Diamond is a key carbonaceous tool to study deep carbon cycle, but most diamond occurrences are limited from kimberlite pi…
View article: Evidence for suboceanic small-scale convection from a “garnet”-bearing lherzolite xenolith from Aitutaki Island, Cook Islands
Evidence for suboceanic small-scale convection from a “garnet”-bearing lherzolite xenolith from Aitutaki Island, Cook Islands Open
Garnet peridotite xenoliths have been rarely reported from suboceanic mantle. Petrographic and geochemical characteristics of garnet-bearing oceanic peridotite xenoliths provide precious information on dynamics of the suboceanic lithospher…
View article: Hydrothermal ferromanganese oxides around a petit-spot volcano on old and cold oceanic crust
Hydrothermal ferromanganese oxides around a petit-spot volcano on old and cold oceanic crust Open
Areas of old and cold oceanic plate lack conventional volcanism and have been assumed to be devoid of submarine hydrothermal activity. However, petit-spot volcanoes are common in areas of flexure of such oceanic plates. Here, we report hyd…
View article: Chemical, mineral and Pb isotopic compositions of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano and related materials
Chemical, mineral and Pb isotopic compositions of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano and related materials Open
The dataset consists of the bulk chemical and mineral compositions of hydrothermal ferromanganese oxides obtained from a petit-spot volcano in the western North Pacific Ocean and Pb isotopic compositions of the hydrothermal ferromanganese …
View article: Elemental mapping data of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano
Elemental mapping data of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano Open
The dataset consists of elemental mapping data of hydrothermal ferromanganese oxides (D05-20 and D05-21) obtained from a petit-spot volcano in the western North Pacific Ocean. The elemental mapping of Al, Ca, Cu, Fe, K, Mg, Mn, Ni, Rb, S, …
View article: Results of independent component analysis for the elemental mapping data of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano
Results of independent component analysis for the elemental mapping data of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano Open
The dataset consists of IC (independent component) sores and IC loadings as the results of ICA (independent component analysis) on elemental mapping data of hydrothermal ferromanganese oxides obtained from a petit-spot volcano in the weste…
View article: X-ray diffraction intensities of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano
X-ray diffraction intensities of the hydrothermal ferromanganese oxides obtained from a petit-spot volcano Open
The dataset is the results of powder X-ray diffraction analysis (consisting of columns of degree of 2θ and X-ray diffraction intensity of each sample) for hydrothermal ferromanganese oxides obtained from a petit-spot volcano in western Nor…
View article: Intermittent Beginning to the Formation of Hydrogenous Ferromanganese Nodules in the Vast Field: Insights from Multi-Element Chemostratigraphy Using Microfocus X-ray Fluorescence
Intermittent Beginning to the Formation of Hydrogenous Ferromanganese Nodules in the Vast Field: Insights from Multi-Element Chemostratigraphy Using Microfocus X-ray Fluorescence Open
Vast ferromanganese nodule fields have been found on the deep-sea floor of all oceans worldwide. They have received attention because they potentially provide high-grade metal resources to develop future high- and green-technology. However…
View article: Fine‐scale chemostratigraphy of cross‐sectioned hydrogenous ferromanganese nodules from the western North Pacific
Fine‐scale chemostratigraphy of cross‐sectioned hydrogenous ferromanganese nodules from the western North Pacific Open
A broad area densely covered by ferromanganese nodules was recently discovered around Minamitorishima (Marcus) Island, representing a high‐potential metal resource, particularly for Co, Ni, Mo, and W. We studied 16 nodule samples from nodu…
View article: A simple determination of whole-rock major- and trace-element composition for peridotite by micro-XRF spectrometer and ICP-MS using fused-glass bead
A simple determination of whole-rock major- and trace-element composition for peridotite by micro-XRF spectrometer and ICP-MS using fused-glass bead Open
A simple analytical procedure for determination of whole-rock major- and trace-element composition by micro-X-ray fluorescence (μXRF) spectrometer and inductively coupled plasma-mass spectrometer (ICP-MS) using fused-glass bead (sample + l…
View article: Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths
Halogen Heterogeneity in the Lithosphere and Evolution of Mantle Halogen Abundances Inferred From Intraplate Mantle Xenoliths Open
We present halogen, noble gas, and major and trace element compositions of mantle xenoliths from intraplate settings (Eifel, Kilbourne Hole, San Carlos, and Hawaii). The xenoliths show a wide range of halogen elemental ratios, which form t…
View article: Metasomatic PGE mobilization by carbonatitic melt in the mantle: Evidence from sub-μm-scale sulfide–carbonaceous glass inclusion in Tahitian harzburgite xenolith
Metasomatic PGE mobilization by carbonatitic melt in the mantle: Evidence from sub-μm-scale sulfide–carbonaceous glass inclusion in Tahitian harzburgite xenolith Open
Platinum-group elements (PGEs) are one of the key tracers to reveal early differentiation processes of the Earth due to their preferential distribution into the metallic core. Meanwhile, informative evidence for early differentiation has b…
View article: Differentiation in the Early Earth's Interior: Constraints from Isotope Geochemistry and High-Pressure Experiments
Differentiation in the Early Earth's Interior: Constraints from Isotope Geochemistry and High-Pressure Experiments Open
We conducted isotopic model calculations and high-pressure melting experiments in order to estimate the major element composition of the “missing reservoir”, which is a supposed component that should compensate the difference in ¹⁴²Nd/¹⁴⁴N…
View article: Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite
Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite Open
The Accessible Silicate Earth (ASE) has a higher 142Nd/144Nd ratio than most chondrites. Thus, if the Earth is assumed to have formed from these chondrites, a complement low-142Nd/144Nd reservoir is needed. Such a low-142Nd/144Nd reservoir…
View article: Additional file 2: Table SA1. of Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite
Additional file 2: Table SA1. of Major element composition of an Early Enriched Reservoir: constraints from 142Nd/144Nd isotope systematics in the early Earth and high-pressure melting experiments of a primitive peridotite Open
Density data for five melt compositions. (XLSX 37.9kb)