A5043240541- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Geology and Paleoclimatology Research
- Geochemistry and Elemental Analysis
- Radioactive element chemistry and processing
- Geological and Geophysical Studies
- Asymmetric Hydrogenation and Catalysis
- Asymmetric Synthesis and Catalysis
- Paleontology and Stratigraphy of Fossils
- Synthetic Organic Chemistry Methods
- Oxidative Organic Chemistry Reactions
- Chemical Synthesis and Analysis
- Isotope Analysis in Ecology
- Geochemistry and Geochronology of Asian Mineral Deposits
- Geological formations and processes
- Metal-Catalyzed Oxygenation Mechanisms
- Synthesis of β-Lactam Compounds
- Hydrocarbon exploration and reservoir analysis
- Planetary Science and Exploration
- Traditional and Medicinal Uses of Annonaceae
- Seismology and Earthquake Studies
- Forensic Anthropology and Bioarchaeology Studies
- Mineralogy and Gemology Studies
Hiroshima University
2018-2024
Kyoto University
2009-2022
Hiroshima Institute of Technology
2021-2022
Planetary Systems (United States)
2019-2022
Hiroshima University of Economics
2020
Graduate School USA
2020
Shimane University
2012
Hokkaido Sapporo Kiyota High School
2012
Tohoku University
2009-2011
Michigan State University
2009
ADVERTISEMENT RETURN TO ISSUEPREVarticleNEXTNew ligands double the scope of catalytic asymmetric dihydroxylation olefinsK. Barry Sharpless, Willi Amberg, Matthias Beller, Hou Chen, Jens Hartung, Yasuhiro Kawanami, Doris Lubben, Eric Manoury, Yasukazu Ogino, Tomoyuki Shibata, and Tatsuzo UkitaCite this: J. Org. Chem. 1991, 56, 15, 4585–4588Publication Date (Print):July 1, 1991Publication History Published online1 July 1991Published inissue 1...
Hf isotope compositions, coupled with Pb‐Sr‐Nd isotopes and trace element for the Miocene to Quaternary volcanic rocks from NE Japan arc have documented geochemical evolution in magma source compositions association back‐arc opening (23–14 Ma). Clear temporal variation ratios is demonstrated, lowest ɛ (+9) early highest (+14) late Quaternary, whereas there are little changes Sr Nd composition. clearly correlated some elemental ratios. The observed attributed a change metasomatic agents...
Isotopic compositions of Pb, Sr, and Nd concentrations trace elements were determined for Quaternary island arc basaltic rocks from northeastern Japan. Sr Pb isotopic ratios decrease, increase the volcanic front toward back arc. The nearest side are nearly identical to those mid‐ocean ridge basalt (MORB). high field strength heavy rare earth show homogeneous MORB‐like characteristics. These observations indicate that mantle wedge beneath Japan originally had a MORB‐type composition was...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and crystal structures of the cinchona alkaloid derivatives used as ligands in osmium-catalyzed asymmetric dihydroxylation olefinsWilli Amberg, Youssef L. Bennani, Raj K. Chadha, Gerard A. Crispino, William D. Davis, Jens Hartung, Kyu Sung Jeong, Yasukazu Ogino, Tomoyuki Shibata, Barry SharplessCite this: J. Org. Chem. 1993, 58, 4, 844–849Publication Date (Print):February 1, 1993Publication History Published online1 May 2002Published...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChirally selective synthesis of sugar moiety nucleosides by chemicoenzymatic approach: L- and D-riboses, showdomycin, cordycepinYukishige Ito, Tomoyuki Shibata, Masafumi Arita, Hiroaki Sawai, Masaji OhnoCite this: J. Am. Chem. Soc. 1981, 103, 22, 6739–6741Publication Date (Print):November 1, 1981Publication History Published online1 May 2002Published inissue 1 November...
The Oto-Zan lava in the Setouchi volcanic belt is composed of phenocryst-poor, sparsely plagioclase-phyric andesites (sanukitoids) and forms a composite flow. phenocryst assemblages element abundances change but Sr–Nd–Pb isotopic compositions are constant throughout sanukitoid at base high-Mg andesite (HMA) contains Mg- Ni-rich olivine Cr-rich chromite, suggesting emplacement mantle-derived hydrous (� 7w t %H 2O) HMA magma. However, sanukitoids contain little H2O phenocryst-poor. liquid...
We report Sr, Nd, and Pb isotope compositions for 17 bulk-rock samples from the submarine Hana Ridge, Haleakala volcano, Hawaii, collected by three dives ROV Kaiko during a joint Japan–US Hawaiian cruise in 2001. The ratios Ridge lavas are similar to those of Kilauea lavas. This contrasts with subaerial Honomanu shield, which Mauna Loa or intermediate between fields. observation that both Kea components coexist individual shields is inconsistent interpretation location volcanoes within chain...
The Genina Gharbia mafic-ultramafic complex consisting of peridotite, pyroxenite, and gabbronorite represents a remnant hydrous magma chamber that was crystallized at the mantle-crust boundary. nature is expressed in high modal (up to 60%) amphibole cumulates reflected variable textural chemical features complex. One important manifestations development corona structure between olivine plagioclase. texture mineralogy varied according activity interstitial liquid, temperature, PH2O....
島根県津和野地域の舞鶴帯北縁部から古原生代の花崗岩類と正片麻岩を見出した.この岩体は苦鉄質岩類を伴い,ペルム系の堆積岩類に挟まれた幅数百mの狭長な地帯にブロックの集合体として産する.ジルコンのU-Pb年代は,正片麻岩が1836±17Ma,トーナル岩-石英閃緑岩が1853±14Ma,花崗閃緑岩が415.2±2.5Maであった.古原生代のジルコンは2.8-2.1Gaの古いコアを持ち,北中国地塊由来と考えられる.デボン紀のものは年代から舞鶴-大江地域の舞鶴帯北帯西部岩体に対比され,岩相構成と産状から古原生代岩体も舞鶴帯北帯構成要素と考えられる.本岩体は,古い地質体ほど構造的上位に位置するという西南日本内帯のパイルナップ構造の一般則から外れ,ジュラ紀の付加体・変成岩と接する舞鶴帯北縁部に産することから,舞鶴帯北縁に沿う横ずれ断層によって異地性ブロックとして定置した可能性がある.