A5030181813- Geological and Geochemical Analysis
- Geochemistry and Geologic Mapping
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Radioactive element chemistry and processing
- Geochemistry and Elemental Analysis
- Paleontology and Stratigraphy of Fossils
- Geology and Paleoclimatology Research
- Ion-surface interactions and analysis
- Hydrocarbon exploration and reservoir analysis
- Geological Studies and Exploration
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Atmospheric and Environmental Gas Dynamics
- Reservoir Engineering and Simulation Methods
- Geological and Geophysical Studies Worldwide
- Drilling and Well Engineering
- Medical Imaging Techniques and Applications
- Astronomical and nuclear sciences
- Advanced Materials Characterization Techniques
- Geological and Geophysical Studies
- Machine Learning in Materials Science
- Planetary Science and Exploration
- Nuclear materials and radiation effects
- Radioactive contamination and transfer
Akita University
2022-2025
Universidad de Granada
2023
Kanazawa University
2020-2022
The University of Tokyo
2014-2020
Planetary Science Institute
2016-2018
Bunkyo University
2014
Abstract Trace element fingerprints preserved in zircons offer clues to their origin and crystallization conditions. Numerous geochemical indicators have been established evaluate the source rock characteristics from a perspective; however, multivariate trace data not sufficiently investigated statistically. As substantial amounts of zircon wide range types become accessible over past few decades, it is now essential reassess utility elements discriminating types. We employed new dataset...
Detrital monazite geochronology has been used in provenance studies. However, there are complexities the interpretation of age spectra due to their wide occurrence both igneous and metamorphic rocks. We use multinomial logistic regression (MLR) cross-validation (CV) techniques establish a geochemical discrimination source The elemental abundance-based was tested by selecting 16 elements from granitic MLR technique revealed that light rare earth (REEs), Eu, some heavy REEs important...
Abstract Archean and Proterozoic layered intrusions represent an important portion of the igneous rock archive their parental magma composition may provide crucial insights into Earth’s magmatic geodynamic evolution. Both komatiitic boninitic magmas have been suggested for several major intrusions, which could imply different tectonic settings formation. We studied ~ 3.2 Ga Ujaragssuit Nunât ultramafic body from southern West Greenland (Ujaragssuit body), contains some oldest chromitites....
ABSTRACT Rationale Matrix effects by secondary ion mass spectrometry (SIMS) are empirically corrected calibration using matrix‐matched reference materials. However, conventional parametric regression cannot estimate the prediction uncertainty to account for difference in compositions of new data and Applying Gaussian process (GPR), a nonparametric probabilistic method, enables correction matrix effect while providing quantitative uncertainty. Methods We developed GPR models estimating...
High precision U–Pb dating using multiple Faraday collectors has become available in LA-MC-ICP-MS.
Abstract The extent of partial melting peridotites is a function temperature, pressure, and fluid supply. Understanding the petrogenesis ultra‐depleted important for elucidating mantle potential temperature role water in mantle. We analyzed major trace element compositions from Kamuikotan zone, Japan. Geochemical models were then generated to constrain conditions their relation boninitic melts. are characterized by minerals with high Mg/Fe Cr/Al ratios, olivine orthopyroxene low Ti Y...
Abstract Numerous ultramafic rocks occur as lens-shaped bodies in the Archaean continental crust exposed southern West Greenland. As some of oldest bodies, determining their origin, mantle segments or magmatic cumulates, is an important yet controversial issue. The origin these remains unclear, in-part because have undergone metasomatic modification since formation, effects this metasomatism so far not been assessed detail, despite being crucial for understanding geochemical evolution. Here,...
Oxide interference can be problematic for trace element and isotopic analyses using laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS).
Abstract We analyze a large database of abyssal peridotite clinopyroxene compositions using log‐ratio transformation, principal component analysis (PCA) and k ‐means clustering, to better understand compositional systematics in peridotites. combine this with open‐system melting models investigate the potential sources variation. PCA shows that 84% variation can be represented only 2‐dimensional information. use clustering classify into four clusters. Clusters 1–3, representing 85% data, show...
Abstract Zircon geochronology has contributed to our understanding of the longevity transcrustal magmatic systems; however, most studies focus on zircon records from felsic rocks due restricted occurrence in mafic-ultramafic rocks. We present U–Pb age, geochemical, and Hf–O isotope data for zircons a hornblendite peridotite Hida Belt, Japan, that offers unique opportunity investigate lifetime long-lived mafic plumbing system an arc setting. found two age clusters: incompatible element-rich...
Abstract Knowledge of the three-dimensional distribution minerals in a rock sample is fundamental importance to deciphering sample’s properties and history. Attenuation-contrast X-ray computed tomography (X-ray CT) widely used geosciences determine distributions or pores, both. Photon counting CT (PC-CT) uses novel energy-resolved detector that allows X-rays with continuous energy spectrum be detected separately within arbitrary ranges. Here we report first results applying laboratory-build...
<p>A summary of U–Pb, O, and Hf isotope trace element data. </p>