The stability of sapphirine-quartz and hypersthene-sillimanite-quartz assemblages: an experimental investigation in the system FeO−MgO−Al2O3−SiO2 under H2O and CO2 conditions

Bertrand, Philippe; Ellis, David J.; Green, David H.

doi:10.1007/bf00307326

Cited by 108 publications

(100 citation statements)

References 43 publications

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“…P-T path of the granulite enclaves from the DSGB. The relevant partial petrogenetic grids in the KFMASH and FMAS systems are based on Hensen (1987), Harley (1998), Hensen and Harley (1990), Bertrand et al (1991) and Carrington and Harley (1995). Also shown is the fluid-absent melting reaction Bt + Pl + Qtz = Opx + Grt/Spl/Crd + Kfs + L (after Vielzeuf and Montel, 1994).…”

Section: Discussionmentioning

confidence: 99%

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Origin of the granulite enclaves in Indo-Sinian peraluminous granites, South China and its implication for crustal anatexis

Zhao

Guo

et al. 2012

Lithos

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Section: Discussionmentioning

confidence: 99%

“…Fig. 9 shows the portion of the petrogenetic grid for the system KFMASH at low fO 2 (Harley, 1998;Hensen, 1987;Hensen and Harley, 1990), with partial quantification from the experimental data from Bertrand et al (1991) and Carrington and Harley (1995).…”

Section: Thermobarometry and P-t Pathmentioning

confidence: 99%

Origin of the granulite enclaves in Indo-Sinian peraluminous granites, South China and its implication for crustal anatexis

Zhao

Guo

et al. 2012

Lithos

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“…4). Hiroi and Ellis (1994) and performed the chemical mapping of garnet from Sri Lankan granulite on yttrium and phosphorus and considered that phosphorus poor core of the garnet was Huckenholtz et al (1981); f, Harley and Hensen (1990) and Bertrand et al (1991);g, Holdaway (1971); h, Johannes and Holtz (1996).…”

Section: Discussionmentioning

confidence: 99%

Timing of attainment of the spinel+quartz coexistence in garnet-sillimanite leucogneiss from Skallevikshalsen, Luetzow-Holm Complex, East Antarctica

Kawakami

Motoyoshi

2004

Journal of Mineralogical and Petrological Sciences

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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 Cr 2 O 3 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.

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“…UHT conditions are furthermore supported by the prograde biotite-dehydration reaction (2) and the rare preservation of prograde sapphirine þ quartz which point to peak temperatures between 890 and 9908C at relatively low pressures. The early stage mineral reactions observed in the sapphirinebearing granulites can be analysed in the model FMAS and KFMAS system (Figure 6) as given in Harley (1998b) with experimental calibrations (Bertrand et al, 1991). The sapphirine forming reaction possibly took place at rising temperatures under lower pressures conditions preceding garnet forming reactions.…”

Section: Petrogenetic Grid and Isochemical Section Modellingmentioning

confidence: 99%

“…Figure 6. Petrogenetic grid for FMAS and KFMAS systems (Hensen and Harley, 1990;Bertrand et al, 1991;Harley, 1998a) showing univariant reactions and divariant fields relevant to the interpretation of the possible P-T reaction inferred from the textures. Inferred P-T trajectories followed by G. Madugula UHT granulites as deduced from the observed sequence of metamorphic reactions from M 1 to M 3 are also shown.…”

Section: : Retrograde Pathmentioning

confidence: 99%

New constraints on the metamorphic evolution of the Eastern Ghats Belt, India, based on relict composite inclusions in garnet from ultrahigh‐temperature sapphirine granulites

Rao

Chmielowski

2011

Geological Journal

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The sapphirine granulites from Gangaraju Madugula, Eastern Ghats Belt (EGB), India preserve a rich variety of mineral assemblages and unique isolated and composite mineral inclusions within garnet that provide robust evidence for extreme crustal metamorphism at ultrahigh temperature (UHT) conditions (>9008C). Diagnostic UHT assemblages in these rocks include sapphirine þ quartz, spinel þ quartz and high alumina orthopyroxene þ sillimanite þ quartz. The stability of spinel þ quartz, sapphirine þ quartz and orthopyroxene þ sillimanite þ quartz assemblages provides evidence for temperatures exceeding 9608C at moderate pressures. The mineral association of garnet-orthopyroxene is indicative of a subsequent high P-UHT metamorphic event as indicated by the high alumina contents of orthopyroxene (>10 wt% Al 2 O 3 ) coexisting with garnet. Peak P-T conditions of $9708C and 9.5 kbars are calculated from conventional garnet-orthopyroxene geothermobarometry. Calculated isochemical sections constructed in the model system Na 2 O-CaO-K 2 O-FeO-MgO-Al 2 O 3 -SiO 2 -H 2 O-TiO 2 -Fe 2 O 3 (NCKFMASHTO) for the sapphirine granulites and garnet-orthopyroxene granulites adequately predict phase relationships that are consistent with those observed in the rocks. An evaluation of the assemblages and textures and P-T estimates indicate a three-stage evolution of the sapphirine granulites and associated garnet-orthopyroxene granulites: (1) inclusion assemblages with sapphirine, spinel and quartz on the low-pressure prograde path (M 1 stage); (2) a peak UHT assemblage of porphyroblastic garnet-orthopyroxene (M 2 stage) and (3) a retrogression that resulted in orthopyroxene-cordierite intergrowths and biotite rims on Grt (M 3 stage). The sapphirine granulites and associated garnet-orthopyroxene granulites indicate that they grew during the prograde and retrograde stage. The thermo-barometric estimates from mineral compositions and the complimentary isochemical sections approached from bulk rock compositions allow tighter constraints to be placed on the P-T evolution of this sector of the EGB.

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The stability of sapphirine-quartz and hypersthene-sillimanite-quartz assemblages: an experimental investigation in the system FeO−MgO−Al2O3−SiO2 under H2O and CO2 conditions

Cited by 108 publications

References 43 publications

Origin of the granulite enclaves in Indo-Sinian peraluminous granites, South China and its implication for crustal anatexis

Origin of the granulite enclaves in Indo-Sinian peraluminous granites, South China and its implication for crustal anatexis

Timing of attainment of the spinel+quartz coexistence in garnet-sillimanite leucogneiss from Skallevikshalsen, Luetzow-Holm Complex, East Antarctica

New constraints on the metamorphic evolution of the Eastern Ghats Belt, India, based on relict composite inclusions in garnet from ultrahigh‐temperature sapphirine granulites

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