A geochemical perspective on charnockite magmatism in Peninsular India

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Abstract

Large charnockite massifs occur in the high-grade Southern Granulite Terrain (SGT) and Eastern Ghats Belt (EGB) crustal provinces of Peninsular India. Available geochronological data indicate that the magmatism is episodic, associated with distinct orogenic cycles in the different crustal domains. The geochemical data also indicate a change in composition from trondhjemitic at ∼3.0-2.9 Ga to dominantly tonalitic at ∼2.6-2.5 Ga to tonalitic-granodiorite-granitic at ∼2.0-1.9 Ga to dominantly tonalitic at 1.7-1.6 Ga to quartz monzonitic or tonalitic at ∼1.0-0.9 Ga to granodiorite-granitic at ∼0.8-0.7 Ga. The trondhjemitic and tonalitic end members are metaluminous, magnesian and calcic to calc-alkalic, characteristic of magnesian group charnockites. The granodioritic to granitic end members are metaluminous to slightly peraluminous, ferroan and calc-alkalic to alkali-calcic, characteristic of ferroan group charnockites. The quartz monzonitic end members are metaluminous to peraluminous, magnesian to ferroan and calcic to calc-alkalic, neither characteristic of the magnesian group nor of the ferroan group of charnockites. Based on the occurrence and difference in composition of the charnockite massifs, it is suggested that the charnockite magmatism registers the crustal growth of the Indian plate on its southern (SGT) and eastern (EGB) sides, along active continental margins by accretion of arcs.

Original languageEnglish
Pages (from-to)773-788
Number of pages16
JournalGeoscience Frontiers
Volume3
Issue number6
DOIs
Publication statusPublished - Nov 1 2012

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charnockite
magmatism
granulite
granodiorite
quartz
Indian plate
continental margin
accretion

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

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title = "A geochemical perspective on charnockite magmatism in Peninsular India",
abstract = "Large charnockite massifs occur in the high-grade Southern Granulite Terrain (SGT) and Eastern Ghats Belt (EGB) crustal provinces of Peninsular India. Available geochronological data indicate that the magmatism is episodic, associated with distinct orogenic cycles in the different crustal domains. The geochemical data also indicate a change in composition from trondhjemitic at ∼3.0-2.9 Ga to dominantly tonalitic at ∼2.6-2.5 Ga to tonalitic-granodiorite-granitic at ∼2.0-1.9 Ga to dominantly tonalitic at 1.7-1.6 Ga to quartz monzonitic or tonalitic at ∼1.0-0.9 Ga to granodiorite-granitic at ∼0.8-0.7 Ga. The trondhjemitic and tonalitic end members are metaluminous, magnesian and calcic to calc-alkalic, characteristic of magnesian group charnockites. The granodioritic to granitic end members are metaluminous to slightly peraluminous, ferroan and calc-alkalic to alkali-calcic, characteristic of ferroan group charnockites. The quartz monzonitic end members are metaluminous to peraluminous, magnesian to ferroan and calcic to calc-alkalic, neither characteristic of the magnesian group nor of the ferroan group of charnockites. Based on the occurrence and difference in composition of the charnockite massifs, it is suggested that the charnockite magmatism registers the crustal growth of the Indian plate on its southern (SGT) and eastern (EGB) sides, along active continental margins by accretion of arcs.",
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A geochemical perspective on charnockite magmatism in Peninsular India. / Rajesh, H. M.

In: Geoscience Frontiers, Vol. 3, No. 6, 01.11.2012, p. 773-788.

Research output: Contribution to journalArticle

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AB - Large charnockite massifs occur in the high-grade Southern Granulite Terrain (SGT) and Eastern Ghats Belt (EGB) crustal provinces of Peninsular India. Available geochronological data indicate that the magmatism is episodic, associated with distinct orogenic cycles in the different crustal domains. The geochemical data also indicate a change in composition from trondhjemitic at ∼3.0-2.9 Ga to dominantly tonalitic at ∼2.6-2.5 Ga to tonalitic-granodiorite-granitic at ∼2.0-1.9 Ga to dominantly tonalitic at 1.7-1.6 Ga to quartz monzonitic or tonalitic at ∼1.0-0.9 Ga to granodiorite-granitic at ∼0.8-0.7 Ga. The trondhjemitic and tonalitic end members are metaluminous, magnesian and calcic to calc-alkalic, characteristic of magnesian group charnockites. The granodioritic to granitic end members are metaluminous to slightly peraluminous, ferroan and calc-alkalic to alkali-calcic, characteristic of ferroan group charnockites. The quartz monzonitic end members are metaluminous to peraluminous, magnesian to ferroan and calcic to calc-alkalic, neither characteristic of the magnesian group nor of the ferroan group of charnockites. Based on the occurrence and difference in composition of the charnockite massifs, it is suggested that the charnockite magmatism registers the crustal growth of the Indian plate on its southern (SGT) and eastern (EGB) sides, along active continental margins by accretion of arcs.

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