A5013912816- Geological and Geochemical Analysis
- High-pressure geophysics and materials
- earthquake and tectonic studies
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Crystal Structures and Properties
- Renin-Angiotensin System Studies
- Analytical chemistry methods development
- Spectroscopy and Quantum Chemical Studies
- Glass properties and applications
- Metallurgical Processes and Thermodynamics
- Mineralogy and Gemology Studies
- Chemical Synthesis and Analysis
- Material Dynamics and Properties
- Hormonal Regulation and Hypertension
- Advanced Chemical Sensor Technologies
- Thermodynamic properties of mixtures
- Neuropeptides and Animal Physiology
- Water Treatment and Disinfection
- Geological Studies and Exploration
- Geological and Geophysical Studies Worldwide
- Clay minerals and soil interactions
- Pharmaceutical and Antibiotic Environmental Impacts
Shizuoka University
2019-2024
University of Shizuoka
2021-2024
Kyoto University
2007-2018
Akita University
2017
Hyogo Prefectural Institute of Environmental Sciences
2003-2011
Laboratoire Magmas et Volcans
2007
University of Bayreuth
2004
Arizona State University
1994-1997
The University of Tokyo
1995-1996
Fukada Geological Institute
1995
Samples of the carbonaceous asteroid Ryugu were brought to Earth by Hayabusa2 spacecraft. We analyzed 17 samples measuring 1 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent formed in outer Solar System. The contain low abundances materials at high temperatures, such as chondrules and calcium- aluminum-rich inclusions. rich phyllosilicates carbonates, which through aqueous alteration reactions temperature, pH,...
The H 2 O-saturated solidus of a model mantle composition (Kilborne Hole peridotite nodule, KLB-1) was determined to be just above 1000°C from 5 11 gigapascals. Given reasonable O abundances in Earth’s mantle, an O-rich fluid could exist only region defined by the wet and thermal stability limits hydrous minerals, at depths between 90 330 kilometers. experimental partial melts monotonously became more mafic with increasing pressure andesitic 1 gigapascal than starting 10 Because chemistry is...
The second critical endpoint in the basalt-H 2 O system was directly determined by a high-pressure and high-temperature X-ray radiography technique. We found that occurs at around 3.4 GPa 770 °C (corresponding to depth of approximately 100 km subducting slab), which is much shallower than previously estimated conditions. Our results indicate melting temperature oceanic crust can no longer be defined beyond this condition fluid released from depths greater under volcanic arcs supercritical...
Slab-derived fluids play an important role in heat and material transfer subduction zones. Dehydration decarbonation reactions of minerals the subducting slab have been investigated using phase equilibria modeling fluid flow. Nevertheless, direct observations chemistry pressure–temperature conditions are few. This report describes CO 2 -bearing saline inclusions spinel-harzburgite xenoliths collected from 1991 Pinatubo pumice deposits. The filled with solutions 5.1 ± 1.0% (wt)...
Subduction-zone magmatism is triggered by the addition of H 2 O-rich slab-derived components: aqueous fluid, hydrous partial melts, or supercritical fluids from subducting slab. Geochemical analyses island arc basalts suggest two signatures a melt and fluid. These liquids unite to fluid under pressure temperature conditions beyond critical endpoint. We ascertain endpoints between sediment high-Mg andesite (HMA) melts located, respectively, at 83-km 92-km depths using an in situ observation...
We report on the Raman spectra of water under high temperature and pressure conditions show a discontinuity in dependence OH stretching frequency. As increases, strength hydrogen bonding increases rapidly ranges up to 0.4±0.1 GPa at 25 °C, 1.0±0.1 100 1.3±0.1 300 °C slowly above these pressures. This finding clearly demonstrates existence discontinuities response bonds water, which suggests possible structural change conditions.
The second critical endpoint in the peridotite‐H 2 O system has been determined using an X‐ray radiography technique together with a Kawai‐type, double‐stage, multianvil driven by DIA‐type cubic press (SPEED‐1500) installed at SPring‐8, Japan. pressure of was appearance and disappearance round shape radiographic images changing experimental pressure. In experiments up to 3.6 GPa, two fluid phases (i.e., aqueous hydrous silicate melt) were observed. At 4.0 however, we could not distinguish...
Other| April 01, 1997 Crystal structure of monoclinic hydrous wadsleyite [β-(Mg,Fe)2 SiO4 ] Joseph R. Smyth; Smyth University Colorado, Department Geological Sciences, Boulder, CO, United States Search for other works by this author on: GSW Google Scholar Tatsuhiko Kawamoto; Kawamoto Stephen D. Jacobsen; Jacobsen Jeffrey Swope; Swope Richard L. Hervig; Hervig John Holloway American Mineralogist (1997) 82 (3-4): 270–275. https://doi.org/10.2138/am-1997-3-404 Article history first online: 02...
Research Article| January 01, 2006 Hydrous Phases and Water Transport in the Subducting Slab Tatsuhiko Kawamoto Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Beppu 874-0903, Japan, e-mail: kawamoto@bep.vgs.kyoto-u.ac.jp Search other works by this author on: GSW Google Scholar Author Article Information Publisher: Mineralogical Society America First Online: 03 Mar 2017 © The Of Reviews Mineralogy Geochemistry (2006) 62 (1): 273–289....
SUMMARY 1. This study was undertaken to examine the possibility that level of angiotensin‐converting enzyme (ACE) increases in vascular tissue, and this may participate pathogenesis hypertension spontaneously hypertensive rat (SHR). 2. In SHR, at established stage, prolonged antihypertensive effect induced by a single oral dose spirapril closely correlated long‐lasting inhibition ACE aortae mesenteric arteries. contrast, plasma, lung, heart kidney recovered from faster than vessels. 3....
Halogen and noble gas systematics are powerful tracers of volatile recycling in subduction zones. We present halogen compositions mantle peridotites containing H 2 O-rich fluid inclusions collected at volcanic fronts from two contrasting zones (the Avacha volcano Kamchatka arc the Pinatubo Luzon arcs) orogenic a peridotite massif Horoman massif, Hokkaido, Japan) which represents an exhumed portion wedge. The aims to determine how volatiles carried into wedge subducted fluids modify mantle....
Geochemical signatures of arc basalts can be explained by addition aqueous fluids, melts, and/or supercritical fluids from the subducting slab to sub-arc mantle. Partitioning large-ion lithophile elements between and melts is crucial as these two liquid phases are present in pressure-temperature conditions. Using a micro-focused synchrotron X-ray beam, situ fluorescence (XRF) spectra were obtained haplogranite or jadeite at 0.3 1.3 GPa 730°C 830°C under varied concentrations (Na, K)Cl (0 25...
Direct observation of aqueous fluids coexisting with MgSiO3 (enstatite) and/or Mg2SiO4 (forsterite) was performed at 0.5-5.8 GPa and 800-1000 °C an externally heated diamond-anvil cell synchrotron X-rays. At 1000 in the -H2O system, forsterite crystallizes below 3 but not above that pressure. congruently dissolves into up to 5 GPa. These observations suggest enstatite have Mg/Si < 1 2