Perrierite in sapphirine-quartz gneiss : geochemical and geochronological features and implications for accessory-phase paragenesis of UHT metamorphism
スポンサーリンク
概要
- 論文の詳細を見る
The Al-rich variety of perrierite has been found in sapphirine-quartz-bearing ultrahigh-temperature (UHT) gneiss from Mt. Riiser-Larsen in the Napier Complex, East Antarctica. The major constituents of this perrierite-bearing gneiss are quartz, orthopyroxene, sapphirine, and osumilite, with minor biotite, K-feldspar, and cordierite. Perrierite, zircon, monazite, and rutile are accessory phases. The perrierite grains have diameters in the range 50-500 μm and are pale brownish-orange in color. They have relatively high Al2O3 and MgO content, and low CaO and FeO content compared to other reported perrierite compositions. [The approximate formula is (La0.7Ce1.6Pr0.2Nd0.6Sm0.1Y0.3Ca0.3)(Fe0.5Mg0.7Al1.0)(Ti2.0Al1.0)Si4.0O22]. The perrierite yields U-Th-Pb chemical ages (ca. 2460 ± 110 Ma) and chondrite-normalized rare earth element (REE) patterns (Cen/Dyn = 10-16) that are similar to those of monazite (ca. 2450 ± 30 Ma and Cen/Dyn = 12-24). Both perrierite and monazite may have been stable accessory phases during UHT metamorphism, and the occurrence of perrierite in this sample is possibly controlled by the relatively low phosphorous and high REE and titanium contents.
- 日本鉱物科学会の論文
- 2007-02-01
著者
-
Hokada Tomokazu
National Institute of Polar Research, 10-3 Midori-cho, Tachikawa, Tokyo 190-8518, Japan
-
Hokada Tomokazu
National Inst. Of Polar Res.
関連論文
- Titanium behavior in quartz during retrograde hydration: Occurrence of rutile exsolution and implications for metamorphic processes in the Sør Rondane Mountains, East Antarctica
- Linking P-T path with development of discontinuous phosphorus zoning in garnet during high-temperature metamorphism : an example from Lutzow-Holm Complex, East Antarctica
- Sm-Nd mineral isochron age of sapphirine-quartz gneiss from the Mt. Riiser-Larsen area in the Napier Complex, East Antarctica
- Ultrahigh temperature sapphirine-osumilite and sapphirine-quartz granulites from Bunt Island in the Napier Complex, East Antarctica -Reconnaissance estimation of P-T evolution -
- Sm-Nd garnet ages of retrograde garnet bearing granulites from Tonagh Island in the Napier Complex, East Antarctica: A preliminary study
- Fluid inclusions in an osumilite-bearing granulite from Bunt Island in the Archean Napier Complex, East Antarctica: implications for a decompressional P-T path?
- Carbonic fluid inclusions in ultrahigh-temperature metamorphic rocks from Tonagh Island in the Archean Napier Complex, East Antarctica: A preliminary report
- Petrography and mineral chemistry of high-grade pelitic gneisses and related rocks from Namaqualand, South Africa
- Fluorine-rich calcic amphiboles in ultrahigh-temperature mafic granulite from Tonagh Island in the Napier Complex, East Antarctica: Preliminary report
- LREE-enriched mafic gneiss and meta-ultramafic rock from Tonagh Island in the Napier Complex, East Antarctica
- New finding of kyanite and andalusite in sillimanite-rich pelitic granulites from the Kerala Khondalite Belt, Southern India
- Feldspar in felsic orthogneiss as indicator for UHT crustal processes
- 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
- Zircon growth in UHT leucosome : constraints from zircon-garnet rare earth elements (REE) relations in Napier Complex, East Antarctica
- Timing of thermal events in eastern Dronning Maud Land, East Antarctica
- Experimental constraints on partial melting under UHT and dry conditions of quartzo-feldspathic rock in the Napier Complex, East Antarctica
- Perrierite in sapphirine-quartz gneiss : geochemical and geochronological features and implications for accessory-phase paragenesis of UHT metamorphism
- Inferred ultrahigh-temperature metamorphism of amphibolitized olivine granulite from the Sor Rondane Mountains, East Antarctica
- Metastable corundum + quartz + andalusite association in pelitic granulite from the Kerala Khondalite Belt, southern India
- New finding of kyanite and andalusite in sillimanite-rich pelitic granulites from the Kerala Khondalite Belt, Southern India