Phase relations in mafic dykes and their host rocks from Kondapalle, Andhra Pradesh, India: Implications for the time–depth trajectory of the Palaeoproterozoic (late Archaean?) granulites from southern Eastern Ghats Belt

Bhui, Uttam K.; Sengupta, P.

doi:10.1016/j.precamres.2007.03.005

Cited by 25 publications

(13 citation statements)

References 51 publications

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“…It is evident from these data and interpretations that intrusion of charnockite-gneiss protolith must be younger than 1.37 Ga. But according to the hypothesis of charnockitic magmatism and emplacement (tonalite) followed by granulite metamorphism [17,26], the intrusion of charnockite-gneiss protolith must be older than 1.2 Ga. On the other hand, Rickers et al [10] indicated that intrusion of the charnockite-gneiss protolith is given by T DM as between 1.9 and 2.9 Ga. It is evident from the aforesaid discussions that neither the khondalites as the oldest component, nor the intrusion of charnockite-gneiss protolith into the metasedimentary granulites (supracrustals) are valid propositions.…”

Section: Geochronologymentioning

confidence: 89%

“…1.7 Ga". Bhui et al [26] also described "intrusion of a suite of voluminous felsic magma (protolith of enderbitic gneiss)" and Kovach et al [27] suggested that "U-Pb zircon data from the felsic magma provided the emplacement age of the felsic magma at 1.7 -1.72 Ga". Accordingly, the sediment deposition in this domain must be older than 1.7 Ga.…”

Section: Geochronologymentioning

confidence: 99%

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Relative Chronology in High-Grade Crystalline Terrain of the Eastern Ghats, India: New Insights

Bhattacharya

Kar²,

Saw

et al. 2011

IJG

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The two major lithology or gneiss components in the polycyclic granulite terrain of the Eastern Ghats, India, are the supracrustal rocks, commonly described as khondalites, and the charnockite-gneiss. Northern Eastern Ghats belt, north of the Godavari rift has been defined as the Eastern Ghats Province, while that to the south has been defined as the Ongole domain; and although, these distinct crustal domains also record different ages of granulite metamorphism, both of these domains are dominated by the two lithologies. Many of the workers considered the khondalites as the oldest component with unknown basement and the charnockiteprotoliths as intrusive into the khondalites. However, published geochronological data do not corroborate the aforesaid relations. Onset of khondalite sedimentation in the Proterozoic Eastern Ghats Province, constrained by detrital zircon data, as around 1.3 Ga and the charnockite-protolith emplacement between 1.9 and 2.9 Ga, argue against intrusion of felsic magma (tonalite, now enderbite!) in to the khondalites. The field relations of the hornblende-mafic granulite with the two gneiss components together with Sm-Nd isotopic data of the hornblende-mafic granulites (both the xenoliths within charnockites and those interbanded with the khondalites) indicate that khondalite sediments were deposited on older mafic crustal rocks. Mafic basement and supracrustal rocks were subsequently deformed and metamorphosed together during collisional orogeny at high to ultra-high temperatures-partial melting of mafic rocks producing the charnockitic melt; and partial melting of pelitic sediments producing the peraluminous granitoids. This is compatible with all the geochronological data as well as the petrogenetic model of partial melting for the charnockitic rocks in the Eastern Ghats Belt. The Ongole domain, south of the Godavari rift, though, is distinct in terms of the age of first/ earliest UHT metamorphism, but here too the charnockite-protoliths are older mafic rocks evidently not intrusive in to the khondalites..

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Section: Geochronologymentioning

confidence: 89%

Section: Geochronologymentioning

confidence: 99%

Relative Chronology in High-Grade Crystalline Terrain of the Eastern Ghats, India: New Insights

Bhattacharya

Kar²,

Saw

et al. 2011

IJG

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“…In the Eastern Ghats Belt that runs along the SE periphery of the Indian plate, extensive anorthositic magmatism has been recognized in previous studies (e.g. Sengupta et al, 1999;Bhui et al, 2007). The recent geological, petrological and geochemical studies on the PangidiKondapalle layered complex (Dharma Rao and Santosh, 2011) and the adjacent Chimalpahad complex (Dharma Rao et al, 2010b) have established their arc-related character.…”

Section: Introductionmentioning

confidence: 85%

U–Pb zircon chronology of the Pangidi–Kondapalle layered intrusion, Eastern Ghats belt, India: Constraints on Mesoproterozoic arc magmatism in a convergent margin setting

Rao

Santosh

Dong

2012

Journal of Asian Earth Sciences

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“…2; Schmitz and Bowring, 2003;Fonarev et al, 2006;Bhui et al, 2007;Santosh et al, 2007aSantosh et al, ,b, 2008Santosh, 2010;Taylor et al, 2010;Tsunogae et al, 2011;Zhang et al, 2012). The cause of this UHT metamorphism is commonly ascribed to intrusion of hot magma from the mantle, but I would like to suggest the possibility that the cause was nuclear fission in localized regions.…”

Section: Effect Of Natural Fission On Thermal History Of the Earthmentioning

confidence: 93%

“…Information for Voronezh from Fonarev et al (2006). Information for Eastern Ghats from Bhui et al (2007). Information for Napier province from Choi et al (2006) and Hokada et al (2008).…”

Section: Effect Of Natural Fission On Thermal History Of the Earthmentioning

confidence: 99%

Did natural fission of 235U in the earth lead to formation of the supercontinent Columbia?

Rogers

2012

Geoscience Frontiers

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Steady decline in the percentage of 235 U in terrestrial uranium made natural fission impossible after about 1.8 Ga. Fission before 1.8 Ga disturbed the lead isotope system at various places worldwide, such as Oklo, Gabon, and may have caused the first lead isotope paradox. Fission in areas of high uranium concentration may also have generated enough heat to localize sparse Archean and Paleoproterozoic UHT belts. The oldest widespread orogenic systems formed at approximately 2.0e1.8 Ga after fission stopped contributing to the earth's heat flow. These early orogenic systems partly created the supercontinent Columbia. ª 2012, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

show abstract

Phase relations in mafic dykes and their host rocks from Kondapalle, Andhra Pradesh, India: Implications for the time–depth trajectory of the Palaeoproterozoic (late Archaean?) granulites from southern Eastern Ghats Belt

Cited by 25 publications

References 51 publications

Relative Chronology in High-Grade Crystalline Terrain of the Eastern Ghats, India: New Insights

Relative Chronology in High-Grade Crystalline Terrain of the Eastern Ghats, India: New Insights

U–Pb zircon chronology of the Pangidi–Kondapalle layered intrusion, Eastern Ghats belt, India: Constraints on Mesoproterozoic arc magmatism in a convergent margin setting

Did natural fission of 235U in the earth lead to formation of the supercontinent Columbia?

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