Two-stage granulite formation in a Proterozoic magmatic arc (Ongole domain of the Eastern Ghats Belt, India): Part 1. Petrology and pressure–temperature evolution

Sarkar, Tapabrato; Schenk, Volker

doi:10.1016/j.precamres.2014.07.026

Cited by 38 publications

(27 citation statements)

References 62 publications

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“…Examples of estimated P-T-t paths for spinel-bearing symplectitic rocks. 1-Himalayan-Tibet Orogen (Weinberg, 2016); 2-Bushveld Complex, South Africa (Johnson et al, 2004); 3-Ongole domain of the Eastern Ghats Belt, India (Sarkar and Schenk, 2014); 4-Paderu, Southern India (Lal et al, 1987); 5-Central Limpopo Mobile Belt, Zimbabwe (Droop, 1989); 6-Eastern Himalayan Syntaxis (Tian et al, 2016); 7-Okanogan dome (Kruckenberg and Whitney, 2011).…”

Section: Geological Backgroundmentioning

confidence: 99%

Petrology, geothermobarometry, and P-T path of spinel-bearing symplectite migmatites from the Simin area, Hamedan, Sanandaj-Sirjan Zone, Iran

Baharifar¹,

Pang²,

Chung³

et al. 2019

Turkish J Earth Sci

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Introduction Reaction textures commonly form during rapid changes in pressure (P) and/or temperature (T) during metamorphism and are useful for determining the chemical and physical processes of the reactions, as well as the metamorphic conditions and part of the P-T path (Carlson and Johnson, 1991; Putnis, 2002). Chemical factors, such as the presence or absence of melt and fluid, may also influence reaction texture development, and in some cases their effects may mimic those of changes of P and/or T. It is therefore important to evaluate the relative roles of compositional and P-T factors. A reaction texture that has received much attention because of its significance for interpreting metamorphic processes and conditions is the symplectitic replacement of Al 2 SiO 5 (Als) polymorphs by other Al-rich phases (

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Section: Geological Backgroundmentioning

confidence: 99%

Petrology, geothermobarometry, and P-T path of spinel-bearing symplectite migmatites from the Simin area, Hamedan, Sanandaj-Sirjan Zone, Iran

Baharifar¹,

Pang²,

Chung³

et al. 2019

Turkish J Earth Sci

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“…The Eastern Ghats Belt (EGB) along the eastern margin of the peninsular India is a classic Proterozoic geological entity that played an integral role in the reconstructions of the Columbia and Rodinia supercontinents (Sengupta et al ., ; Rickers et al ., ; Zhao et al ., ; Dobmeier & Raith, ; Li et al ., ; Bose et al ., ; Dasgupta et al ., ; Henderson et al ., ; Pisarevsky et al ., ; Sarkar et al ., ). The Ongole domain in the southern part of the EGB exposes a variety of granulite‐facies rocks dominated by intermediate (enderbite) to felsic (charnockite) granulites, with enclaves of mafic and metapelitic granulites (Dobmeier & Raith, ; Sarkar & Schenk, ). Detailed geochemical (Rickers et al ., ; Upadhyay et al ., ; Dharma Rao & Santosh, ; Sarkar et al ., ), geochronological (Kovach et al ., ; Simmat & Raith, ; Upadhyay et al ., ; Bose et al ., ; Henderson et al ., ; Sarkar et al ., ) and petrological (Dasgupta et al ., ; Sengupta et al ., ; Sarkar & Schenk, ) studies indicate that the Ongole domain formed as a magmatic arc in the late Palaeoproterozoic ( c .…”

Section: Introductionmentioning

confidence: 99%

“…The Ongole domain in the southern part of the EGB exposes a variety of granulite‐facies rocks dominated by intermediate (enderbite) to felsic (charnockite) granulites, with enclaves of mafic and metapelitic granulites (Dobmeier & Raith, ; Sarkar & Schenk, ). Detailed geochemical (Rickers et al ., ; Upadhyay et al ., ; Dharma Rao & Santosh, ; Sarkar et al ., ), geochronological (Kovach et al ., ; Simmat & Raith, ; Upadhyay et al ., ; Bose et al ., ; Henderson et al ., ; Sarkar et al ., ) and petrological (Dasgupta et al ., ; Sengupta et al ., ; Sarkar & Schenk, ) studies indicate that the Ongole domain formed as a magmatic arc in the late Palaeoproterozoic ( c . 1.75 Ga) and experienced UHT tectono‐metamorphic events during the early Mesoproterozoic (1.6–1.5 Ga).…”

Section: Introductionmentioning

confidence: 99%

Early Mesoproterozoic (1.6–1.5 Ga) granulite facies events in the Ongole domain: geodynamic significance and global correlation

Sarkar

Schenk²

2016

Journal Metamorphic Geology

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The late Palaeoproterozoic to early Mesoproterozoic Ongole domain of the Eastern Ghats Belt in southeastern India is composed of a suite of charnoenderbites with enclaves of metapelitic and mafic granulites. Geochemical data for all meta‐igneous rocks are typical for continental magmatic arc suites. The rocks preserve mineral assemblages and reaction textures indicating two separate metamorphic events: an initial counter‐clockwise medium‐pressure ultrahigh temperature (MP−UHT) event (>900 °C at 6.5–7.0 kbar), attributed to the magmatic accretion of the arc, which was followed by a clockwise HP‐MT event (~700 °C at 9 kbar), attributed to its tectonic crustal thickening. Zircon dating of charnoenderbites yield magmatic crystallization ages between 1.75 and 1.70 Ga and metamorphic ages between 1.62 and 1.60 Ga. Syn‐metamorphic enderbites yield magmatic and metamorphic zircon ages of c. 1.60 Ga, overlapping with all other metamorphic rim ages. In contrast, texturally controlled monazite dating of two chemically distinct monazite generations reveals two metamorphic events at c. 1.62 and c. 1.54 Ga. These data suggest that the Ongole domain was formed as a magmatic arc during the Palaeoproterozoic (c. 1.75–1.70 Ga), and subsequently experienced UHT metamorphism accompanied by syn‐metamorphic intrusions at c. 1.60 Ga, suggesting magmatic underplating as the metamorphic heat source. The subsequent crustal thickening at c. 1.54 Ga was due to the collision of the Ongole magmatic arc with the Indian craton. The UHT metamorphism and the related orogenic processes of the Ongole domain fall into the assumed late Palaeoproterozoic to late Mesoproterozoic ‘orogenic and UHT time gap’ (1.8–1.1 Ga) regarded by some studies as an orogenic quiescent period after the formation of the Palaeoproterozoic supercontinent known as Columbia or Nuna at c. 2.1–1.8 Ga. Coeval orogenic processes at c. 1.7–1.5 Ga occurring along accretionary margins in different fragments of Columbia (India, Australia, Antarctica and southwest Africa) indicate a protracted formation of this supercontinent.

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“…They involve diopside inclusions in olivine suggesting its reaction with dolomite (Di + Dol ➔ Ol + Cc + CO 2 ) as described in high-grade calc-silicates by Satish-Kumar et al Kumar et al (2001). Clinohumite can form by a very similar reaction as produced the olivine (Di + Dol + H 2 O ➔ Chu + Cal + CO 2 ) or after olivine itself (Dol + Ol + H 2 O ➔ Chu + Cal + CO 2 ) (Satish-Kumar et al Kumar et al 2001;Proyer et al 2008). However, as the clinohumite is not seen to either interact with, or overgrow the olivine it is assumed to have formed by the former rather than the latter mechanism.…”

Section: Granulite-facies Eventmentioning

confidence: 93%

“…Some authors (e.g. Faryad and Hoinkes 2003;Godard 2009;Sarkar and Schenk 2014) have interpreted similar garnet as indicating a distinct higher-pressure metamorphic process; while, others (e.g. Sommer and Kröner 2013) have confined such garnet to a late stage of a singular P-T-t path.…”

Section: Amphibolite-facies Eventmentioning

confidence: 99%

Polymetamorphic evolution of the granulite-facies Paleoproterozoic basement of the Kabul Block, Afghanistan

2015

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The Kabul Block is an elongate crustal fragment which cuts across the Afghan Central Blocks, adjoining the Indian and Eurasian continents. Bounded by major strike slip faults and ophiolitic material thrust onto either side, the block contains a strongly metamorphosed basement consisting of some of the only quantifiably Proterozoic rocks south of the Herat-Panjshir Suture Zone. The basement rocks crop-out extensively in the vicinity of Kabul City and consist predominantly of migmatites, gneisses, schists and small amounts of higher-grade granulite-facies rocks. Granulite-facies assemblages were identified in felsic and mafic siliceous rocks as well as impure carbonates. Granulite-facies conditions are recorded by the presence of orthopyroxene overgrowing biotite in felsic rocks; by orthopyroxene overgrowing amphibole in mafic rocks and by the presence of olivine and clinohumite in the marbles. The granulite-facies assemblages are overprinted by a younger amphibolite-facies event that is characterized by the growth of garnet at the expense of the granulite-facies phases. Pressure-temperature (P-T) conditions for the granulite-facies event of around 850°C and up to 7 kbar were calculated through conventional thermobarometry and phase equilibria modeling. The younger, amphibolite-facies event shows moderately higher pressures of up to 8.5 kbar at around 600°C. This metamorphism likely corresponds to the dominant metamorphic event within the basement of the Kabul Block. The results of this work are combined with the lithostratigraphic relations and recent geochronological dating to analyze envisaged Paleoproterozoic and Neoproterozoic metamorphic events in the Kabul Block.

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Two-stage granulite formation in a Proterozoic magmatic arc (Ongole domain of the Eastern Ghats Belt, India): Part 1. Petrology and pressure–temperature evolution

Cited by 38 publications

References 62 publications

Petrology, geothermobarometry, and P-T path of spinel-bearing symplectite migmatites from the Simin area, Hamedan, Sanandaj-Sirjan Zone, Iran

Petrology, geothermobarometry, and P-T path of spinel-bearing symplectite migmatites from the Simin area, Hamedan, Sanandaj-Sirjan Zone, Iran

Early Mesoproterozoic (1.6–1.5 Ga) granulite facies events in the Ongole domain: geodynamic significance and global correlation

Polymetamorphic evolution of the granulite-facies Paleoproterozoic basement of the Kabul Block, Afghanistan

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