Petrology and Geochemistry of Metamorphosed Basic Intrusives from Chilka Lake Granulites, Eastern Ghats Belt, India: Implications for Rodinia Breakup

Bose, Sankar; Das, Kaushik; Chakraborty, Suman; Miura, Hiroyuki

doi:10.1007/978-3-642-12496-9_14

Cited by 4 publications

(4 citation statements)

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“…This was followed by cooling (M4 at c. 730 Ma), and subsequent thermal overprinting (M5 at 550–500 Ma). The mafic granulite layers within the migmatite complex have been studied by Bose et al (2011b) who showed that these layers are metamorphosed basic intrusives that underwent granulite-facies metamorphism and recrystallisation. As the intrusives invaded the c. 983 Ma anorthosite (Chatterjee et al , 2008), Bose et al (2011b) considered the age of emplacement younger than c. 983 Ma.…”

Section: Discussionmentioning

confidence: 99%

“…Mafic granulites and orthopyroxene-bearing felsic gneiss (charnockite, as mentioned in earlier studies) constitute integral components of the migmatite granulite suite (Bhattacharya et al , 1994). While the status of the charnockite is controversial, mafic granulites are identified as deformed and metamorphosed mafic dykes emplaced at > c. 800 Ma (Bose et al , 2011b). Some of the orthopyroxene-bearing felsic gneisses were identified previously as either larger charnockite bodies or as smaller charnockite patches (Bhattacharya et al , 1994).…”

Section: Background Geologymentioning

confidence: 99%

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Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Bose

Das

Torimoto

et al. 2020

MinMag

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Orthopyroxene-bearing felsic gneiss occurs as foliation-parallel layers and bands together with aluminous granulite, mafic granulite, and quartzofeldspathic granulite in the Chilka Lake migmatite complex of the Proterozoic Eastern Ghats Belt, India. The rock was classified previously as charnockite which underwent granulite-facies metamorphism. Field and textural features of this rock show evidence of the partial melting of a biotite-bearing greywacke protolith. Orthopyroxene with/without garnet and cordierite were produced with K-feldspar as peritectic phases of incongruent melting of presumed metaluminous sediments. Fluid-inclusion data suggest the presence of high-density CO2-rich fluids during peak metamorphism, which are similar to those found in associated aluminous granulite. Whole-rock major and trace element data show wide variability of the source materials whereas REE distributions show enriched LREE and flat HREE patterns. Zircon grains from representative samples show the presence of inherited cores having spot dates (SHRIMP) in the range c. 1790–3270 Ma. The overgrowth on zircon was formed predominantly during c. 780–730 Ma and sporadically during c. 550–520 Ma. Some neoblastic zircons with c. 780–730 Ma ages are also present. U-rich dark zones surrounding cores appear partially metamictised, but spot ages from this zone vary within c. 1000–900 Ma. The <1000 Ma ages represent metamorphism that mirrors the events in associated aluminous granulite. The sources of metaluminous sediments are speculative as the rock compositions are largely modified under granulite-facies metamorphism and partial melting. Considering the accretionary tectonic setting of the Eastern Ghats Belt during the c. 1000–900 Ma time frame, a greywacke-type protolith for the migmatite complex has been proposed.

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Section: Discussionmentioning

confidence: 99%

Section: Background Geologymentioning

confidence: 99%

Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Bose

Das

Torimoto

et al. 2020

MinMag

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“…Presence of possible chilled margin (now characterized by profuse concentration of garnet) suggests intrusive relation with the migmatitic aluminous granulite. Petrological and geochemical characteristics of this rock are discussed in detail by Bose et al (2011b).…”

Section: Salient Petrological Features Of the Studied Granulitesmentioning

confidence: 99%

Petrotectonic framework of granulites from northern part of Chilka Lake area, Eastern Ghats Belt, India: Compressional vis-à-vis transpressional tectonics

Das¹,

Bose

Karmakar

et al. 2012

J Earth Syst Sci

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Granulite-facies rocks occurring northeast of the Chilka Lake anothosite (Balugan Massif) show a complex metamorphic and deformation history. The M 1-D 1 stage is identified only through microscopic study by the presence of S 1 internal foliation shown by the M 1 assemblage sillimanite-quartz-plagioclasebiotite within garnet porphyroblasts of the aluminous granulites and this fabric is obliterated in outcrop to map-scale by subsequent deformations. S 2 fabric was developed at peak metamorphic condition (M 2-D 2) and is shown by gneissic banding present in all lithological units. S 3 fabric was developed due to D 3 deformation and it is tectonically transposed parallel to S 2 regionally except at the hinge zone of the F 3 folds. The transposed S 2 /S 3 fabric is the regional characteristic structure of the area. The D 4 event produced open upright F 4 folds, but was weak enough to develop any penetrative foliation in the rocks except few spaced cleavages that developed in the quartzite/garnet-sillimanite gneiss. Petrological data suggest that the M 4-D 4 stage actually witnessed reactivation of the lower crust by late distinct tectonothermal event. Presence of transposed S 2 /S 3 fabric within the anorthosite arguably suggests that the pluton was emplaced before or during the M 3-D 3 event. Field-based large-scale structural analyses and microfabric analyses of the granulites reveal that this terrain has been evolved through superposed folding events with two broadly perpendicular compression directions without any conclusive evidence for transpressional tectonics as argued by earlier workers. Tectonothermal history of these granulites spanning in Neoproterozoic time period is dominated by compressional tectonics with associated metamorphism at deep crust.

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“…India, as an integral part of the Rodinia supercontinent, presently preserves the geological records of major rearrangements of pre‐existing cratonic blocks along many of its Grenvillian‐aged orogenic belts. Eastern Ghats Belt in the east of the Archean Bastar Craton (Bose et al, 2011; Das et al, 2021; Ganguly et al, 2018) and Aravalli‐Delhi Mobile Belt (ADMB) in the west of Archean‐Mesoproterozoic Aravalli Craton (Bhowmik et al, 2012; Gupta et al, 1997; Roy & Jakhar, 2002; Sharma, 2010; Singh et al, 2021; Wang et al, 2017,b, 2019, 2021) are two such widely studied orogenic belts. In the Rodinia supercontinent, the North Indian Block (NIB), which consisted of the Aravalli (Mewar) and Bundelkhand cratons, was amalgamated with the elusive ‘Marwar Block’ along the ADMB (Fareeduddin & Banerjee, 2020; Wang et al, 2017,b, 2019), and was closely associated with the Cathaysia Block of South China, Madagascar and Seychelles (Wang et al, 2021; Wang, Cawood, Zhou, et al, 2017) in the Rodinia.…”

Section: Introductionmentioning

confidence: 99%

U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

Okazaki,

Das,

Chattopadhyay

et al. 2023

Geological Journal

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The gneisses of the Sarwar‐Junia Fault Zone (SJFZ), in the Mangalwar Gneissic Complex, a part of the Banded Gneissic Complex (BGC‐II) of northwest India recorded two phases of metamorphism. The pelitic gneiss from SJFZ mainly consists of biotite, sillimanite, garnet, quartz, K‐feldspar and plagioclase. On the other hand, the granitic gneiss from SJFZ mainly consists of quartz, plagioclase, K‐feldspar and biotite. From zircon and monazite geochronology, the protolith of pelitic gneiss was deposited on basement granitic gneiss and the metamorphism occurred at ca. 950 Ma affecting both the granitic gneiss and the pelitic gneiss. Estimation of the P‐T conditions of metamorphism and pseudosection modelling of the pelitic gneiss revealed that the peak stage metamorphic condition of M2 culminated at ~850°C and ~7 kbar pressure followed by a near‐isobaric cooling. Large garnet porphyroblasts in contact with retrograde biotite shows Fe‐Mg resetting close to the core region, which implies a slow cooling. Therefore, the possible exhumation during the subduction‐collision tectonics was very slow, if not completely ceased, at ca. 950 Ma. The shared tectonothermal history of the Sandmata Metamorphic Complex and Mangalwar Metamorphic Complex in the BGC‐II is now evident from the present study of the SJFZ, and confirms the presence of Grenvillian‐aged tectonothermal events in the eastern part of BGC‐II. The abovementioned near‐isobarically cooled and hydrated crust of the SJFZ records subsequent event(s) of shallow crustal brittle faulting as evident by the presence of pseudotachylyte veins and cataclastic fabric observed in the studied gneisses. Brittle faulting possibly occurred between ca. 905 Ma and ca. 750 Ma, as interpreted from the present geochronological data.

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Petrology and Geochemistry of Metamorphosed Basic Intrusives from Chilka Lake Granulites, Eastern Ghats Belt, India: Implications for Rodinia Breakup

Cited by 4 publications

References 43 publications

Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Origin of orthopyroxene-bearing felsic gneiss from the perspective of ultrahigh-temperature metamorphism: an example from the Chilka Lake migmatite complex, Eastern Ghats Belt, India

Petrotectonic framework of granulites from northern part of Chilka Lake area, Eastern Ghats Belt, India: Compressional vis-à-vis transpressional tectonics

U–Pb geochronology and metamorphic history of gneissic rocks from Sarwar‐Junia Fault Zone, Rajasthan, NW India: Implications for the tectonothermal evolution of the Aravalli‐Delhi Mobile Belt

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