Timing of attainment of the spinel + quartz coexistence in garnet-sillimanite leucogneiss from Skallevikshalsen, Lutzow-Holm Complex, East Antarctica
スポンサーリンク
概要
- 論文の詳細を見る
Spinel in direct contact with quartz is newly found in the Grt-Sil leucogneiss from Skallevikshalsen, Lützow-Holm Complex, East Antarctica. It is included in the outermost core of the garnet porphyroblast and is characterized by low ZnO content (2.77-3.83 wt%) and very low Cr2O3 content (0-0.09 wt%). Incorporation of 2.77-3.39 wt% ZnO stabilized the Spl + Qtz assemblage to lower temperatures for about 50 degrees. As a result, their coexistence can be attained around the peak P-T conditions of Skallevikshalsen. The occurrence of relic staurolite, kyanite and breakdown texture of staurolite to spinel and kyanite included in the garnet core suggests that prograde stage is preserved in the garnet core and breakdown of staurolite itself was attained in the kyanite stability field. The Spl + Qtz assemblage is included at outermost part of the garnet core, suggesting that outermost core of the garnet was formed near the peak metamorphic conditions. Decrease in anorthite content of plagioclase included in the garnet core from that found in the rock matrix suggests that decompression took place during garnet formation. Attainment of these reaction sequences requires clockwise P-T path as previously proposed for the Lützow-Holm Complex.
- 日本鉱物科学会の論文
- 2004-10-01
著者
-
Motoyoshi Yoichi
National Institute of Polar Research
-
Kawakami Tetsuo
Department Of Earth Sciences Faculty Of Education Okayama University
関連論文
- Linking P-T path with development of discontinuous phosphorus zoning in garnet during high-temperature metamorphism : an example from Lutzow-Holm Complex, East Antarctica
- Granulites from Cape Hinode in the amphibolite-facies eastern part of Prince Olav Coast, East Antarctica: New evidence for allochthonous block in the Lutzow-Holm Complex
- Geochemistry of mafic metamorphic rocks in the Lutzow-Holm Complex, East Antarctica: Implications for tectonic evolution
- Calc-silicate rocks and marbles from Lutzow-Holm Complex,East Antarctica, with special reference to the mineralogy and geochemical characteristics of calc-silicate mega-boudins from Rundvagshetta
- Geology of Byobu Rock and Gobanme Rock, Prince Olav Coast, East Antarctica
- Regional-Scale Excess Ar wave in a Barrovian type metamorphic belt, eastern Tibetan Plateau
- Foreword
- Foreword
- Foreword
- High-grade metamorphic rocks from Skallevikshalsen in the Lutzow-Holm Complex, East Antarctica: metamorphic conditions and possibility of partial melting
- High-grade metamorphic rocks from Christmas Point in the Napier Complex, East Antarctica
- Ultrahigh-temperature metamorphic rocks from Howard Hills in the Napier Complex, East Antarctica
- Mineral ages for multi isotope system in phlogopite-bearing pyroxene granulite and felsic gneiss, the Howard Hills, Enderby Land, East Antarctica: Possible Proterozoic tectonothermal events in the Napier Complex
- Occurrences of metamorphosed ultramafic rock and associating rocks in Howard Hills, Enderby Land, East Antarctica: Evidence of partial melting from geochemical and isotopic characteristics
- Lamproite dykes in the Napier Complex at Tonagh Island, Enderby Land, East Antarctica
- Granulite-facies beryllium pegmatites in the Napier Complex in Khmara and Amundsen Bays, western Enderby Land, East Antarctica
- ARRESTED CHARNOCKITE FORMATION IN SRI LANKA : FIELD AND PETROGRAPHICAL EVIDENCE FOR LOW-PRESSURE CONDITIONS
- Arrested charnockite formation in Sri Lanka: Field and petrographical evidence for low-pressure conditions
- STABILITY OF OSUMILITE IN GRANULITE FACIES METAMORPHISM : KMAS SYSTEM AND NATURAL OCCURRENCES
- Stability of osumilite in granulite facies metamorphism: KMAS system and natural occurrences
- Foreword
- Orientation contrast images of garnet in granulite-facies quartzite, Lutzow-Holm Complex, East Antarctica
- GEOCHRONOLOGICAL CONSTRAINTS ON THE METAMORPHIC EVOLUTION AT RUNDVAGSHETTA, EAST ANTARCTICA
- SAPPHIRINE-BEARING SILICA-UNDERSATURATED GRANULITES FROM FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA : EVIDENCE FOR A CLOCKWISE P-T PATH?
- AN EXPERIMENTAL STUDY OF A CORDIERITE-BEARING GRANULITE FROM RUNDVAGSHETTA, LUTZOW-HOLM BAY, EAST ANTARCTICA
- REACTION TEXTURES IN GRANULITES FROM FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA : AN ALTERNATIVE INTERPRETATION ON THE METAMORPHIC EVOLUTION OF THE RAYNER COMPLEX
- PRELIMINARY REPORT ON STRUCTURES OF FOREFINGER POINT, ENDERBY LAND, EAST ANTARCTICA
- STRUCTURAL EVOLUTION OF RUNDVAGSHETTA REGION, LUTZOW-HOLM BAY, EAST ANTARCTICA
- A PRELIMINARY REPORT ON CORDIERITE-BEARING ASSEMBLAGES FROM RUNDVAGSHETTA, LUTZOW-HOLM BAY, EAST ANTARCTICA : EVIDENCE FOR A DECOMPRESSIONAL P-T PATH?
- Petrography and mineral chemistry of high-grade pelitic gneisses and related rocks from Namaqualand, South Africa
- New evidence for prograde metamorphism and partial melting of Mg-Al-rich granulites from western Namaqualand, South Africa
- Timing of ductile deformation and peak metamorphism in Skallevikshalsen, Lutzow-Holm Complex, East Antarctica
- THE SIGNIFICANCE OF EUHEDRAL CALCIC PLAGIOCLASE INCLUSIONS IN GARNET FROM THE LUTZOW-HOLM COMPLEX, EAST ANTARCTICA : A TEXTURAL INDICATOR OF PARTIAL MELTING IN PELITIC GNEISSES
- PROVENANCE OF THE LUTZOW-HOLM COMPLEX, EAST ANTARCTICA-ION MICROPROBE U-Pb STUDY OF ZIRCONS (II)
- Electron microprobe technique for U-Th-Pb and REE chemistry of monazite, and its implications for pre-, peak- and post- metamorphic events of the Lutzow-Holm Complex and the Napier Complex, East Antarctica
- Timing of thermal events in eastern Dronning Maud Land, East Antarctica
- LOCAL FORMATION OF HERCYNITE-PLAGIOCLASE SYMPLECTITE AFTER GARNET AND SILLIMANITE IN KHONDALITE FROM HABARANA, SRI LANKA : MINERAL TEXTURES
- Structural evolution of the Ongul Islands, Lutzow-Holm Complex, East Antarctica
- Timing of attainment of the spinel + quartz coexistence in garnet-sillimanite leucogneiss from Skallevikshalsen, Lutzow-Holm Complex, East Antarctica
- Structural analysis of the Lutzow-Holm Complex in Akarui Point, East Antarctica, and overview of the complex
- Magmatic andalusite from the migmatite zone of the Aoyama area, Ryoke metamorphic belt, SW Japan, and its importance in constructing the P-T path
- LOW-PRESSURE GRANULITE-FACIES METAMORPHISM IN THE PRYDZ BAY REGION, EAST ANTARCTICA
- Low-pressure granulite-facies metamorphism in the Prydz Bay region, East Antarctica (abstract)
- Rb-Sr WHOLE-ROCK AGES OF METAMORPHIC ROCKS FROM EASTERN QUEEN MAUD LAND, EAST ANTARCTICA (2) : TENMONDAI ROCK AND RUNDVAGSHETTA
- High-pressure and high-temperature phase relations of an orthopyroxene granulite from McIntyre Island, Enderby Land, East Antarctica
- Foreword
- DEFINITION OF FOLD ELEMENTS IN THE VICINITY OF LUTZOW-HOLM BAY AND PRINCE OLAV COAST, EAST ANTARCTICA