The Manamedu Complex: Geochemical constraints on Neoproterozoic suprasubduction zone ophiolite formation within the Gondwana suture in southern India

Yellappa, T.; Chetty, T.R.K.; Tsunogae, Toshiaki; Santosh, M.

doi:10.1016/j.jog.2009.12.004

Cited by 89 publications

(48 citation statements)

References 79 publications

(100 reference statements)

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“…The interpretation of magnetotelluric and revised gravity model confirm the PCSZ to be the trace of a major suture zone, and correlate well with a plate tectonic model of subduction-collision-accretion tectonics along this zone related to the final amalgamation of the Gondwana supercontinent (Naganjaneyulu and Santosh, 2010). y New discoveries of ophiolitic complexes such as Manamedu (Yellappa et al, 2010;Sato et al, 2011), Devattur (Yellappa et a. 2012) Agali have come to light yielding the ages of ~ 0.8 Ga and ~ 2.5Ga.…”

Section: Recent Advancessupporting

confidence: 59%

The Cauvery Suture Zone: Map of structural architecture and recent advances

Chetty

2015

J Geol Soc India

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A new structural-architectural map of the Cauvery Suture Zone revealing broad lithology, shear zones, fold forms, foliation trajectories and other structural fabrics, along with kinematic displacements has been brought out by making use of available data sets to fulfill the essential requirement of all geoscientists. Recent advances in understanding the tectonothermal history of the CSZ are also highlighted.

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Section: Recent Advancessupporting

confidence: 59%

The Cauvery Suture Zone: Map of structural architecture and recent advances

Chetty

2015

J Geol Soc India

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“…Drury et al, 1984;Collins et al, 2007;Santosh et al, 2009), with recent studies identifying ophiolitic components and high-pressure eclogitic rocks within them (e.g. Sajeev et al, 2009;Yellappa et al, 2010;Santosh et al, 2011). In the above scenario, the southern blocks (Madurai and Trivandrum blocks) became part of the Indian ensemble during the Neoproterozoic, with ocean closures along the Palghat Cauvery shear zone and the Achankovil zone.…”

Section: Discussion E Implications On the Tectonic Models For Peninsumentioning

confidence: 95%

A geochemical perspective on charnockite magmatism in Peninsular India

Rajesh

2012

Geoscience Frontiers

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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 w3.0e2.9 Ga to dominantly tonalitic at w2.6e2.5 Ga to tonalitic-granodiorite-granitic at w2.0e1.9 Ga to dominantly tonalitic at 1.7e1.6 Ga to quartz monzonitic or tonalitic at w1.0e0.9 Ga to granodiorite-granitic at w0.8e0.7 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. ª 2012, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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“…The PCSZ is considered to be a trace of the Gondwana suture in southern India, with its extensions in Madagascar to the west and in Sri Lanka and probably Antarctica to the east within the Gondwana supercontinent ensemble (e.g., Collins et al, 2007a;Santosh et al, 2009). A recent laser ablation ICP mass spectrometry (LA -ICP -MS) for zircon U -Pb study of plagio-granite in a dismembered ophiolite suite Yellappa et al, 2010) within the PCSZ system constrained the timing of magmatic history correlating with the opening of the Mozambique Ocean floor as ~ 800 Ma or older (Sato et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Laser ablation ICP mass spectrometry for zircon U-Pb geochronology of metamorphosed granite from the Salem Block: Implication for Neoarchean crustal evolution in southern India

Sato

Santosh

Tsunogae

et al. 2011

Journal of Mineralogical and Petrological Sciences

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We report here petrological characteristics of metamorphosed granite and metagabbro from the Kanja Malai hills, the southern margin of the Salem Block in southern India. Field observations suggest that both these rock types experienced high -grade metamorphism, and exhibit strong foliation. Many of cores of zircons extracted from the granite show an internal structure suggesting magmatic crystallization. In contrast, rims of the zircons commonly display metamorphic overgrowth. We also present geochronological data utilizing laser ablation ICP mass spectrometry technique on the zircons that show the weighted means of 207 Pb/ 206 Pb age of 2647 ± 11 Ma (error: 1σ) for the timing of magmatism, and 2442 ± 20 Ma (error: 1σ) for the subsequent high -grade metamorphism. Together with a previous geochronological study on charnockites from the Salem Block, our results also provide an important constraint on the Neoarchean magmatism (2.65 -2.53 Ga) in southern India, correlating the magmatism with a major global crust formation event during the Neoarchean.

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The Manamedu Complex: Geochemical constraints on Neoproterozoic suprasubduction zone ophiolite formation within the Gondwana suture in southern India

Cited by 89 publications

References 79 publications

The Cauvery Suture Zone: Map of structural architecture and recent advances

The Cauvery Suture Zone: Map of structural architecture and recent advances

A geochemical perspective on charnockite magmatism in Peninsular India

Laser ablation ICP mass spectrometry for zircon U-Pb geochronology of metamorphosed granite from the Salem Block: Implication for Neoarchean crustal evolution in southern India

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