Experimental constraints of metamorphic pressure and temperature, and phase relations of a phlogopite-bearing orthopyroxene granulite from Howard Hills, Napier Complex, East Antarctica
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Accession number;04A0874348
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| Title;Experimental constraints of metamorphic pressure and temperature, and phase relations of a phlogopite-bearing orthopyroxene granulite from Howard Hills, Napier Complex, East Antarctica |
| Author;
SATO K
(Ehime Univ., Matsuyama, Jpn)
MIYAMOTO T
(Kyushu Univ., Fukuoka, Jpn)
KAWASAKI T
(Ehime Univ., Matsuyama, Jpn)
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Journal Title;J Mineral Petrol Sci
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Journal Code:G0150B
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ISSN:1345-6296
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VOL.99;NO.4;PAGE.191-201(2004)
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| Figure&Table&Reference;FIG.7, TBL.6, REF.31 |
| Pub. Country;Japan |
| Language;English |
| Abstract;High-pressure and high-temperature experiments were carried out at 9-13kbar and 950-1200.DEG.C. using a piston-cylinder apparatus, simulating the equilibrium conditions of a phlogopite-bearing orthopyroxene granulite from the Howard Hills, Napier Complex, East Antarctica. This granulite consists of orthopyroxene, sapphirine, spinel, alkali feldspar and F-rich phlogopite with minor amounts of plagioclase, rutile and quartz, and is garnet-free. The experiments clarified the equilibrium phase relations of the phlogopite-bearing orthopyroxene granulite under ultrahigh-temperature metamorphism conditions. The following mineral assemblages were obtained with decreasing temperature: orthopyroxene+spinel+liquid, orthopyroxene+phlogopite+spinel+liquid, orthopyroxene+phlogopite+sapphirine+spinel+rutile+liquid, orthopyroxene+alkali feldspar+phlogopite+sapphirine+spinel+rutile, orthopyroxene+alkali feldspar+plagioclase+phlogopite+sapphirine+spinel+rutile. Liquid was found in run products at 9kbar and temperatures of .GEQ.1100.DEG.C., and at pressures of 11-13kbar and 1150.DEG.C.. At higher pressure, garnet coexists with orthopyroxene, alkali feldspar, plagioclase, phlogopite, sapphirine, rutile and spinel. These experimental results constrain the P-T conditions of garnet-free, phlogopite-bearing orthopyroxene granulite from the Howard Hills. (author abst.) |
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