Naotatsu Shikazono

Keio University

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Yasumasa Ogawa

Akita University

Hirohiko Kashiwagi

Keio University

Masaaki Shimizu

Tokyo Medical and Dental University

Daizo Ishiyama

Akita University

Hodaka Kawahata

The University of Tokyo

Haruhiro Ohtani

Keio University

Atsushi Suzuki

National Institute of Advanced Industrial Science and Technology

Minoru Utada

Chiba University

Chiaki Igarashi

Japan Agency for Marine-Earth Science and Technology

Shin‐ichi Kimura

Institute for Molecular Science

Cooperative Institutions

Keio University

The University of Tokyo

National Institute of Advanced Industrial Science and Technology

Geological Survey of Japan

Tohoku University

Kyushu University

Russian Academy of Sciences

Akita University

Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry

Hokkaido University

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Stannoidite-bearing tin ore; mineralogy, texture and physicochemical environment of formation

The Canadian Mineralogist (1987)

Masaaki Shimizu Naotatsu Shikazono

Texture (cosmology)

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Citations (8)

Hydrothermal alteration associated with epithermal vein-type deposits in Japan: a review

Naotatsu Shikazono

Uranium ore

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Citations (11)

Winter sea surface temperature variations based on coral oxygen isotope record from Ishigaki Island, the Ryukyus, Japan and transition of its dominant climate factor with 1988/1989 climate regime shift

Geochimica et Cosmochimica Acta (2006)

Tomoaki Tsunoda Hodaka Kawahata Atsushi Suzuki Kayo Minoshima Naotatsu Shikazono

10.1016/j.gca.2006.06.1226

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Chemical process and environment of hydrothermal alteration of acidic volcanic rocks in the Mitsuishi district, southwest Japan.

GEOCHEMICAL JOURNAL (2002)

Atsushi Nabetani Naotatsu Shikazono

The Mitsuishi district, noted for the largest Roseki production in Japan, is generally characterized by the alteration zoning from center to margin; Quartz zone → Roseki ore (Pyrophyllite, Pyrophyllite-sericite and Sericite zones) → K-feldspar-sericite zone → Albite zone. They are overlain by Weakly propylitized zone. The filling temperatures of fluid inclusions in euhedral quartz crystals indicate the hydrothermal solution was about 300–350°C for the formation of Quartz zone. The chemical composition of the hydrothermal solution was estimated from salinity of the fluid inclusions, analytical results of altered rocks and minerals (feldspars and sericite), thermochemical calculations on the K-feldspar-albite and muscoviteparagonite solid solutions and equilibria in the Na2O-K2O-SiO2-Al2O3-H2O-HCl system, and mobility calculation on the water-rock interaction process. It is deduced that pH dramatically increased, while K and SiO2 concentrations decreased, and Na concentration remained relatively constant in the hydrothermal solution from center to margin of the alteration zones.

Sericite

Pyrophyllite

Fluorite

Topaz

10.2343/geochemj.36.255

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Citations (5)

An experimental study on felsic rock?artificial seawater interaction: implications for hydrothermal alteration and sulfate formation in the Kuroko mining area of Japan

Mineralium Deposita (2005)

Yasumasa Ogawa Naotatsu Shikazono Daizo Ishiyama Hinako Sato Toshio Mizuta

Felsic

Anhydrite

Artificial seawater

10.1007/s00126-004-0454-8

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Citations (21)

Anthropogenic chromium contamination in soils in urban areas: A prospect and retrospect

Geochimica et Cosmochimica Acta (2006)

Kazuo Otomo H. M. Zakir Naotatsu Shikazono

10.1016/j.gca.2006.06.936

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Geological Study of Groundwater in Tono area, Gifu

Abstracts of Annual Meeting of the Geochemical Society of Japan (2006)

Kohei Tokuyama Naotatsu Shikazono

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Mechanisms for anhydrite and gypsum formation in the Kuroko massive sulfide–sulfate deposits, north Japan

Mineralium Deposita (2006)

Yasumasa Ogawa Naotatsu Shikazono Daizo Ishiyama Hinako Sato Toshio Mizuta

Anhydrite

Sulfide Minerals

10.1007/s00126-006-0101-7

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Citations (26)

Associated metals in vein-type deposits in Japan; interpretation using the HSAB principle

The Canadian Mineralogist (1992)

Naotatsu Shikazono Masaaki Shimizu

Vein-type deposits in Japan associated with volcanic activity of Cretaceous to Quaternary ages can be divided into two major types based on the association of metals. The gold-silver deposits are characterized by enrichments of Hg, Te, Se, As, Sb, Cd and Tl, in addition to Au and Ag, whereas base-metal deposits are characterized by Pb, Zn, Mn, Ag, Cu, Bi, As, Sb, ln, Ga, Sn and W. The HSAB ftard and soft acids and bases) principle can explain this difference successfully. Relatively sofi elemenls (e.g., Au, Ag, Hg, Cd, Tl) tend to be enriched in the gold-silver deposits, whereas hard elements (e.9., Pb, Zn, Mn, In, Ga, Sn, W) are concentrated in the base-metal deposits. Concentrations of relatively soft ligands such as HS- are higher in ore fluids responsible for the gold-silver deposits than in fluids responsible for the base-metal deposits. On the other hand, concentrations of relatively hard ligands such as Cl- and CO32- are higher in the ore fluids responsible for the base-metal deposits than those responsible for the gold-silver deposits. Thus, the difference in the ligand (Cf, HS-, CO32-) concentrations of the ore fluids can be also rationalized by the above-mentioned principle.

HSAB theory

Base metal

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Citations (4)

Hydrothermal Flux and Global Ocean Chemistry.

Journal of Geography (Chigaku Zasshi) (1995)

Naotatsu Shikazono

Hydrothermal flux from mid-oceanic ridges and back arc basins influences global seawater chemistry. For instance, Mg problem (Dreyer, 1974) can be solved by taking into account of Mguptake from seawater due to the interaction of seawater with oceanic crust under hydrothermal conditions. SO42-also removes considerably from seawater to oceanic crust. Ca, Si and K transfer from oceanic crust to seawater. This interaction takes place not only at mid-oceanic ridge axis, but also at mid-oceanic ridge flank system. The influence of hydrothermal flux from present-day back arc basins on seawater chemistry is small, compared with that of midoceanic ridges. However, hydrothermal flux from back arc basins in Circum Pacific region during middle Miocene (25-15 Ma)(e. g. Green tuff activity) is large. Especially, hydrothermal fluxes of volatile elements (S, As, Sb, Bi, Cl) from back arc basins are large, compared with the hydrothermal fluxes from mid-oceanic ridges. It is concluded that global seawater chemistry is controlled not only by exogenic processes (e. g. river input, sedimentation) but also by endogenic processes (e. g. hydrothermal activity).

Oceanic basin

10.5026/jgeography.104.16

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Citations (1)