website: https://www.jamstec.go.jp/souran/html/Katsuhiko_Suzuki_8b2a0-e.html
Isotope geochemistry on mantle and sedimentary rocks
meteorite petrology and O-isotopes
His primary area of interest is abiotic/prebiotic organic compounds in Earth and planetary system. His research also covers a wide area of organic geochemistry, geochemistry of the early Earth, and astrobiology.
website: https://staff.aist.go.jp/a.ohta/MyHome_en.htm
Speciation study of trace elements in soils and sediments using XAFS and sequential extraction method; statistical analysis of geochemical data (geochemical map); geochemical reference materials
Petrology and geochemistry of igneous rocks, and geodynamic process
He has been studying stable isotope geochemistry, especially the environmental behavior of heavy elements. His research interests are focused on mass spectrometric techniques for isotope ratio measurements and their application to studies on the behavior of stable isotopes and radionuclides in the environment.
My primary interests are in chronology and isotope geochemistry. I apply a variety of isotopes, including radiocarbon and Rb-Sr isotopes, to environmental, archaeological, and geological materials. Through the chemical and isotopic analysis, I aim for a better understanding of the Earth and human histories, and the dynamic processes of the Earth’s surface materials.
Cycles of various elements based on concentrations, isotope ratios, and chemical speciation. Development of new methods of X-ray spectroscopy (XAFS, XRF, and X-ray microscopy). Chemistry at solid-water interface and its systematic understanding. Rare earth elements geochemistry and resources. Environmental geochemistry of toxic elements and radionuclides. Aerosol chemistry. Development of geochemical isotope tool based on chemical state analysis.
His research focuses primarily on the petrology and chemistry of the most primitive chondritic meteorites and their constituent components (e.g., chondrules, matrix, organics, presolar grains, and water) with the aim of elucidating the major processes involved in the formation and early evolution of the Solar System.
Inorganic environmental hydrochemistry
Isotope geochemistry on sediment and rock
His research mainly deals with the geology and tectonics of various terranes in the Korean Peninsula. Current research is focused on detrital zircon geochronology of the Gyeonggi Marginal Belt, Korea, as an essential component of the Qinling–Gyeonggi microcontinent.
My research is mainly following up the related fields of environmental geochemistry, environmental chemistry and environmental radiochemistry, and focusing on the interaction mechanisms of heavy metals and/or radionuclides at solid-water interface at molecular level.
Field geology of supracrustal rocks in Archaean terrains; comparative studies of early and late Archaean greenstone belts; hydrothermal alteration and gold mineralization; Archaean surface processes and crustal evolution; habitat of early life.
experimental petrology, igneous petrology
My main research tool is rare earth element and their radiogenic and stable isotope geochemistry in geological rocks and meteorites. I also applied these tools to hot-spring water and stream sediments. Recently, I also started to develop precise and accurate stable isotope ratio of REEs using MC-ICP-MS to understand stable isotope fractionation during magma evolution processes.
Main interests are in aqueous geochemistry and water-rock/sediments interaction, including pollution of hydrosphere and pedosphere, diagenetic reaction in both of subareal and oceanic crusts, and hydrothermal systems.
geobiology
Biogeochemical cycles based on the distribution organic compounds and their isotopic compositions in nature.
I am interested in igneous petrology, geology and geochronology for a rock worldwide, particularly in Asia and South America.
I have been working on geochemical cycling and concentration of elements near Earth's surface environments in both economic and environmental perspectives. Redox evolution of the surface environments and hydrothermal geochemistry are related. Employed research techniques include geochemical and isotopic analyses or rock samples, laboratory experiments, and theoretical calculations.
Enviromental geochemistry, Molecular geochemistry, Trace element speciation
My specialization is on stable (carbon, oxygen and sulfur) and radiogenic (Sr-Nd-U-Th-Pb) isotope geochemistry in understanding crustal processes, including metamorphism and magmatism. I am also interested in fundamental isotope fractionation processes and recycling of elements and isotopes in deep earth, as well as the process that were active in the early Earth.
Organic Geochemistry based on biomarker and kerogen (humic substance and geomacromolecule) analyses of sediment, fossil, and living organism (culture) samples. Paleoenvironmental investigation of marine/lacustrine sediments, peat, and coaly sediment. Thermal experiment for kerogen chemistry.
Isotope Geochemistry and mantle Geochemistry
My research interests include the related fields of marine organic geochemistry, environmental studies, environmental biogeochemisty with the application of stable isotopes and molecular biomarkers
Analytical chemistry, Hydrospheric chemistry
Cosmochemistry; Laboratory Experiments
Organic Geochemistry, Organic Astrochemistry
Low temperature geochemistry and environmental radioactivity
Her research involves investigation of Large Igneous Provinces, focusing mostly on oceanic plateaus and the utilization of radiogenic isotopes for tracing mantle sources and Earth processes.
Chronology, meteorite, In-situ U-Pb dating
isotope geochemistry; igneous petrogenesis
Organic biogeochemistry, Aquatic environments
He has analyzed older rocks as well as recent marine sediments in order to estimate the depositional environment from the chemical composition of the sedimentary rocks. In recent years, he has engaged in the evaluation of the inland sea environment and the environment in Mongolia.
I’m interested in fate of the organic matters preserved in unconsolidated and consolidated sediments and material cycles of biophile elements, C, N, S, through the geosphere–hydrosphere–atmosphere–biosphere. So, I measure composition of biomarker molecules and stable isotopic ratios of the biophile elements in the sedimentary organic matters and organisms to reveal their sources and maturity. Particularly, interaction between sedimentary organic matter and hydrothermal fluids and chemosynthesis-based animals relying on geofluid emitting from seafloor are main target of my research.
Professor Yokoyama’s research interests are Paleoclimatology and Earth Surface Processes. He is using various isotopes such as radiocarbon, uranium series dating and terrestrial cosmogenic nuclides to understand the Earth systems.
marine isotope geochemist, working on B and Li isotopes in subduction zone
His research develops novel instruments (SIMS and SNMS) to anatomize meteorites and extraterrestrial materials including returned samples by planetary exploration, and applies the isotopic and chemical approaches to understanding the origin and evolution of the solar system and planets.
Geochemistry of metamorphic and magmatic rocks at convergent plate margins
His research interests include the crustal formation in collision zones, the Paleogeographic reconstructions of the Tibetan Tethys, and the evolution of the Tibetan Plateau from magmatic perspective.