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Letter. Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica
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Tomokazu Hokada
Published/Copyright:
March 26, 2015
Abstract
Ultrahigh metamorphic temperatures attained in the mid- to lower-crust have been assessed by examining the mineral chemistry of ternary feldspars with relatively coarse exsolution lamellae from the Archean Napier Complex, East Antarctica. Chemical compositions of re-integrated perthitic, mesoperthitic and antiperthitic feldspars are calculated from the modal proportions and the chemical analyses of host and lamellar domains formed through exsolution. Based on ternary feldspar solvus models, re-integrated compositions of feldspars from a variety of rock types yield the minimum equilibrium temperatures ranging from 1000 to 1110 °C (0.8 GPa). These data confirm the suggestion that the regional thermal conditions of the Napier Complex reached or exceeded 1100 °C. As feldspar is one of the common constituents of the crustal rocks, this approach could be applicable to a wide variety of rocks in which feldspar represents exsolution textures
Received: 2000-10-30
Accepted: 2001-3-10
Published Online: 2015-3-26
Published in Print: 2001-7-1
© 2015 by Walter de Gruyter Berlin/Boston
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Articles in the same Issue
- Calcite inclusions in forsterite
- The induced thermoluminescence and thermal history of plagioclase feldspars
- Characterization and comparison of structural and compositional features of planetary quadrilateral pyroxenes by Raman spectroscopy
- A P21/c-C2/c high-pressure phase transition in Ca0.5Mg1.5Si2O6 clinopyroxene
- Energy-filtered transmission electron microscopy (EFTEM) of intergrown pyroxenes
- TEM analysis of microbial mediated sedimentation and lithification in modern marine stromatolites
- Mineralogy of a natural As-rich hydrous ferric oxide coprecipitate formed by mixing of hydrothermal fluid and seawater: Implications regarding surface complexation and color banding in ferrihydrite deposits
- A C/MoS2 mixed-layer phase (MoSC) occurring in metalliferous black shales from southern China, and new data on jordisite
- Step edges on galena (100): Probing the basis for defect driven surface reactivity at the atomic scale
- Solubility study of Ti,Zr-based ceramics designed to immobilize long-lived radionuclides
- Characterization of synthetic Cs-Li cancrinite grown in a butanediol-water system: An NMR spectroscopic and Rietveld refinement study
- Optical spectra of Co2+ in three synthetic silicate minerals
- Spectroscopic standards for four- and fivefold-coordinated Fe2+ in oxygen-based minerals
- Hydrous species in crystalline and metamict titanites
- First principles study of water adsorption on the (100) surface of zircon: Implications for zircon dissolution
- A molecular dynamics study of the glass transition in CaAl2Si2O8: Thermodynamics and tracer diffusion
- The crystal structure of aravaipaite
- Letter. Feldspar thermometry in ultrahigh-temperature metamorphic rocks: Evidence of crustal metamorphism attaining ~1100 °C in the Archean Napier Complex, East Antarctica
