Browsing ELibrary by Author "Kagi H."

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A NEW METHOD FOR THE DETERMINATION OF CEIII/CEIV RATIOS IN GEOLOGICAL MATERIALS; APPLICATION FOR WEATHERING, SEDIMENTARY AND DIAGENETIC PROCESSES

Takahashi Y.; Shimizu H.; Kagi H.; Yoshida H.; Usui A.; Nomura M. (2000)

Relative abundances of rare earth elements (REE) in geological materials are used widely to investigate diverse geochemical issues such as the origins of igneous rocks or the degree of stratification of water columns in ...
CARBONATITIC MELTS IN CUBOID DIAMONDS FROM UDACHNAYA KIMBERLITE PIPE (YAKUTIA): EVIDENCE FROM VIBRATIONAL SPECTROSCOPY

Zedgenizov D.A.; Shatsky V.S.; Sobolev N.V.; Kagi H. (2004)

Micro-inclusions (1-10 μm) in 55 diamonds of cubic habit from the Udachnaya kimberlite pipe have been studied using vibrational spectroscopy. This has revealed a multiphase assemblage in cuboid diamonds from the Udachnaya ...
DIRECT OBSERVATION OF TETRAVALENT CERIUM IN FERROMANGANESE NODULES AND CRUSTS BY X-RAY-ABSORPTION NEAR-EDGE STRUCTURE (XANES)

Takahashi Y.; Shimizu H.; Usui A.; Kagi H.; Nomura M. (2000)

X-ray-absorption near-edge structure (XANES) was successfully applied for the direct determination of Ce valence in hydrogenetic ferromanganese nodules (two samples) and crust (one sample). Rare earth element (REE) patterns ...
EVIDENCE FOR ICE VI AS AN INCLUSION IN CUBOID DIAMONDS FROM HIGH P-T NEAR INFRARED SPECTROSCOPY

Kagi H.; Lu R.; Davidson P.; Goncharov A.F.; Mao H.K.; Hemley R.J. (2000)

Near infrared absorption (NIR) spectra of natural morphologically cubic polycrystalline diamonds (cuboid) were obtained at room temperature, and the stretching plus bending combination band of molecular water was observed. ...
EVIDENCE FOR SUBDUCTION-RELATED COMPONENTS IN THE SUBCONTINENTAL MANTLE FROM LOW 3HE/4HE AND 40AR/36AR RATIO IN MANTLE XENOLITHS FROM FAR EASTERN RUSSIA

Yamamoto J.; Kaneoka I.; Nakai S.; Kagi H.; Prikhod'ko V.; Arai S. (2004)

By applying both vacuum crushing and stepwise heating methods for the extraction of the noble gases, we have discovered ³He/⁴He ratios much lower than the atmospheric ratio (∼0.3 RA; RA is the atmospheric ³He/⁴He ratio of ...
EXPERIMENTAL ALTERATION OF MOLYBDENITE: EVALUATION OF THE RE-OS SYSTEM, INFRARED SPECTROSCOPIC PROFILE AND POLYTYPE - THE PGE CONTENT OF FLUIDS AT MAGMATIC TEMPERATURES

Suzuki K.; Kagi H.; Nara M.; Takano B.; Nozaki Y. (2000)

Experiments have been carried out to clarify the effect of alteration on Re-Os system, near infrared (NIR)-infrared (IR) spectroscopic characteristics and polytype of a natural molybdenite mineral (MoS2). The molybdenite ...
FOSSIL PRESSURES OF FLUID INCLUSIONS IN MANTLE XENOLITHS EXHIBITING RHEOLOGY OF MANTLE MINERALS: IMPLICATIONS FOR THE GEOBAROMETRY OF MANTLE MINERALS USING MICRO-RAMAN SPECTROSCOPY

Yamamoto J.; Kagi H.; Kaneoka I.; Lai Y.; Prikhod'ko V.S.; Arai S. (2002)

Micro-Raman spectroscopic analysis allows us to estimate the internal pressure of small fluid inclusions. We applied this method to CO2-dominated fluid inclusions in mantle-derived xenoliths. The pressures estimated from ...
PRESSURE DEPENDENCE OF THE OH-STRETCHING MODE IN F-RICH NATURAL TOPAZ AND TOPAZ-OH

Komatsu K.; Kuribayashi T.; Kudoh Y.; Kagi H.; Okada T.; Parise J.B. (2005)

OH stretching vibration modes for F-rich natural topaz (F-topaz) and for fully hydrated topaz (topaz-OH) synthesized at high pressure, were observed using IR and Raman spectroscopies at pressures up to 30.4 GPa and 17.3 ...

Browsing ELibrary by Author "Kagi H."

Browsing ELibrary by Author "Kagi H."

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