Browsing ELibrary by Author "Ogasawara Y."

Now showing items 1-9 of 9

CARBON RECYCLED INTO DEEP EARTH: EVIDENCE FROM DOLOMITE DISSOCIATION IN SUBDUCTION-ZONE ROCKS

Zhu Y.; Ogasawara Y. (2002)

The dolomite-dissociation textures documented here in rocks from the Kokchetav ultrahigh-pressure massif suggest that the experimentally expected dolomite dissociation happened in the subducted slabs represented by these ...
CLINOPYROXENE PHENOCRYSTS (WITH GREEN SALITE CORES) IN TRACHYBASALTS: IMPLICATIONS FOR TWO MAGMA CHAMBERS UNDER THE KOKCHETAV UHP MASSIF, NORTH KAZAKHSTAN

Zhu Y.; Ogasawara Y. (2004)

Clinopyroxene phenocrysts in the Kokchetav trachybasalts are variable in composition and textures. Two distinctive cores are recognized: diopside cores and green salite cores. The diopside cores with Mg# of 80-90 are mantled ...
COESITE EXSOLUTION FROM SUPERSILICIC TITANITE IN UHP MARBLE FROM THE KOKCHETAV MASSIF, NORTHERN KAZAKHSTAN

Ogasawara Y.; Fukasawa K.; Maruyama S. (2002)

Coesite exsolved from supersilicic titanite was discovered in an impure calcite marble at Kumdykol in the Kokchetav UHP (ultrahigh-pressure) metamorphic terrane, northern Kazakhstan. This impure marble consists mainly of ...
MINERAL INCLUSIONS IN ZIRCON FROM DIAMOND-BEARING MARBLE IN THE KOKCHETAV MASSIF, NORTHERN KAZAKHSTAN

Katayama I.; Ohta M.; Ogasawara Y. (2002)

In order to constrain the metamorphic evolution of deeply subducted impure marble from the Kokchetav massif, we investigated mineral inclusions in zircon, which is known to protect ultrahigh-pressure (UHP) phases from ...
OXYGEN, CARBON, AND STRONTIUM ISOTOPE GEOCHEMISTRY OF DIAMOND-BEARING CARBONATE ROCKS FROM KUMDY-KOL, KOKCHETAV MASSIF, KAZAKHSTAN

Ohta M.; Ogasawara Y.; Mock T.; Rumble D. (2003)

Diamond-bearing carbonate rocks from Kumdy-Kol, Kokchetav massif, Kazakhstan, were strongly altered by fluids flowing through fractures and infiltrating along grain boundaries during exhumation. Alteration includes ...
PERMIAN VOLCANISM IN THE MONGOLIAN OROGENIC ZONE, NORTHEAST CHINA: GEOCHEMISTRY, MAGMA SOURCES AND PETROGENESIS

Yongfeng Z.H.U.; Libing G.U.; Shihua S.U.N.; Jiang N.; Honma H.; Ogasawara Y. (2001)

Lower Permian volcanism was the first magmatic activity to occur after the collision events in the Mongolian orogenic zone, east China. The Permian volcanic rocks are therefore a key to understanding the dynamics of the ...
PHLOGOPITE AND COESITE EXSOLUTION FROM SUPER-SILICIC CLINOPYROXENE

Zhu Y.; Ogasawara Y. (2002)

We document the exsolution of phlogopite and coesite/quartz from pre-existing super-silicic clinopyroxene in dolomite marble from the Kokchetav massif, northern Kazakhstan. The exsolution texture was formed by clinopyroxene ...
THE MINERALOGY OF THE KOKCHETAV 'LAMPROITE': IMPLICATIONS FOR THE MAGMA EVOLUTION

Zhu Y.; Ogasawara Y.; Ayabe T. (2002)

Kokchetav ‘lamproite’ occurs in the east end of Kokchetav massif and consists of phenocryst (mainly clinopyroxene) and matrix (mainly feldspar). The compositions of clinopyroxene, magnetite and biotite phenocryst were ...
TWO STAGE GROWTH OF MICRODIAMOND IN UHP DOLOMITE MARBLE FROM KOKCHETAV MASSIF, KAZAKHSTAN

Ishida H.; Ogasawara Y.; Ohsumi K.; Saito A. (2003)

The abundance and morphology of microdiamond in dolomite marble from Kumdy-kol in the Kokchetav Massif, are unusual; a previous study estimated the maximum content of diamonds in dolomite marble to be about 2700 carat ...

Browsing ELibrary by Author "Ogasawara Y."

Browsing ELibrary by Author "Ogasawara Y."

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