Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation

Sengupta, P.; Sen, Joydip; Dasgupta, Somnath; Raith, M.; Bhui, Uttam K.; Ehl, Jürgen

doi:10.1093/petroj/40.7.1065

Cited by 127 publications

(38 citation statements)

References 56 publications

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“…The prograde P-T conditions of the granulite enclaves were estimated using the following two aspects: (i) the metamorphic reactions (1) and (2) indicates an initial temperature at around 800°C (Sengupta et al, 1999); and (ii) the thickness of the Cambrian-Permian sediments ranged from 21 to 25 km (BGMRGX, 1985), corresponding to 6.0-7.0 kbar. By combining the prograde, peak and retrograde stages of the metamorphic conditions, we constitute the P-T path for the studied granulite enclaves (Fig.…”

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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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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“…This belt preserves vestiges of UHT metamorphism with a characteristic retrograde near isobaric cooling path (Dasgupta and Sengupta, 1995 and references therein). In Gondwana configurations, the Eastern Ghats Belt is juxtaposed against East Antarctica, and there are a number of reports on sapphirine, spinel, orthopyroxene and sillimanite bearing UHT rocks from various domains in this belt (e.g., Sengupta et al, 1999). Sarkar et al (2003) recently studied spinel bearing Mg Al granulites from the Vizianagram area in this belt in which they also reported very high density CO 2 inclusions.…”

Section: Vizianagram (Eastern Ghats Belt India)mentioning

confidence: 99%

"Ultrahigh density" carbonic fluids in ultrahigh-temperature crustal metamorphism

Santosh

Tsunogae

Yoshikura

2004

Journal of Mineralogical and Petrological Sciences

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Ultrahigh temperature (UHT) granulites in Tonagh Island, Napier Complex, East Antarctica record peak metamorphic pressure temperature (P T) conditions of up to 9 kbar and 1100°C. Sapphirine, garnet, orthopyroxene and quartz in these rocks contain very high density fluid inclusions with melting temperatures close to that of pure CO 2 (−56.6°C) and homogenization temperatures down to −34.9°C translating into high CO 2 densities (up to 1.07 g/cm 3 ). The UHT granulites of Vizianagram in Eastern Ghats Belt, India which were subjected to extreme crustal metamorphism at >1000°C and 8 9 kbar also carry very high density (up to 1.15 g/cm 3 ) pure CO 2 inclusions in quartz adjacent to spinel rimmed by various coronas of sillimanite, orthopyroxene and garnet. Garnets in a granulite facies rock from Salem in southern India that equilibrated at peak P T conditions of 740 800°C and 9 11 kbar carry the highest density (1.17 g/cm 3 ) pure CO 2 yet reported from continental crust. This rock also contains very high density CO 2 inclusions in plagioclase and quartz. High density (0.998 g/cm 3 ) pure CO 2 rich fluid inclusions also occur abundantly within garnets from a mafic granulite in Ampitiya, central Highland Complex, Sri Lanka. The peak P T conditions of metamorphism of the mafic granulite are around 10.6 kbar and 985°C with subsequent rapid isothermal decompression along a clock wise path down to 5.5 kbar. In most of the cases above, the representative isochores for the CO 2 inclusions either penetrate through or pass very close to the P T windows defined from mineral phase equilibria indicating that the fluid inclusions were trapped at the time of peak or near post peak metamorphism. We thus recognize a group of "ultrahigh density" (UHD) CO 2 rich fluids that characterize UHT rocks and other granulites formed under extreme crustal metamorphism. These fluids contrast sharply with the lower density (generally <1.0 g/cm 3 ) CO 2 inclusions commonly reported from normal granulite facies rocks in various terrains. The presence of "synmetamorphic" UHD CO 2 within various minerals is consistent with the low water activities predicted by the mineral assemblages in these rocks. Although the source of the CO 2 is equivocal, mantle derived mafic magmas could have provided the heat and volatiles required for crustal metamorphism at extreme conditions displayed by these rocks.

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“…In the Kondapalle region, south of Godavari Rift (Figure 1), an UHT granulite facies metamorphism, with deep crustal heating, resulted in a peak temperature greater than 10008C and pressure greater than 10 kbars, followed by isobaric cooling (IBC) (Sengupta et al, 1999). North of the Godavari Rift (Figure 1), an early UHT ($10008C) metamorphic event (M 1 ) at crustal depths of 30-35 km (8.4 kbars) is reported from high Mg-Al granulites in G. Madugula (Mohan et al, 1997), and several nearby areas including Paderu (Lal et al, 1987;Pal and Bose, 1997;Bhattacharya and Kar, 2002), Anantagiri (Sengupta et al, 1990), Anakapalle (Dasgupta et al, 1994;Sanyal and Fukuoka, 1995;Rickers et al, 2001a;), Araku and Vizianagram (Kamineni and Rao, 1988).…”

Section: Metamorphic History Of the Egbmentioning

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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Ultra-high Temperature Metamorphism of Metapelitic Granulites from Kondapalle, Eastern Ghats Belt: Implications for the Indo-Antarctic Correlation

Cited by 127 publications

References 56 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

"Ultrahigh density" carbonic fluids in ultrahigh-temperature crustal metamorphism

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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