Multiple convergences along an Archean craton margin: Clues from Proterozoic ophiolite remnants, granites and granulite domains along the SE margin of India

Saha, Dilip; Sain, Arnab

doi:10.1016/j.jog.2018.04.004

Cited by 9 publications

(7 citation statements)

References 75 publications

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“…The thrusting of the Neoarchean granitic gneiss and the NSB along the Vellikonda Thrust (marking the eastern edge of the NFB) and of the Nallamalai Group on the relatively undeformed sequences from the western subbasins along the Maidukuru Thrust have produced the complex structural geometry of the sequence in the NFB. These structural patterns testify to the fact that this fold belt is an allochthonous unit, produced during a collisional tectonic regime (Saha and Sain, 2019). Recent studies on intrusive granitic rocks near Vellaturu, Ipuru and Nakerikallu from the NFB confirm that they are arc-magmatic intrusives.…”

Section: Nallamalai Fold Belt (Nfb)mentioning

confidence: 68%

“…This complex and associated high-grade metamorphic rocks from the Vinjamuru Group (Fig. 3) is considered to be 1.9 Ga old (Vijaya Kumar et al, 2010, Saha andSain, 2019). A younger Kanigiri ophiolitic melange (~1.3 Ga) occurs in the northern parts of the NSB.…”

Section: Nellore Schist Belt (Nsb)mentioning

confidence: 99%

“…The closure of the oceanic realm and overthrusting of this block was associated with lower crustal melting that led to the emplacement of a large number of alkaline-granitoid intrusive bodies in the thrust sheets. These include the PAkP; Kanigiri, Kantamvaripalle, Podili, Vinukonda granites that were emplaced within the NSB; and also perhaps the Vellaturu-Ipuru-Nakerikallu granites emplaced within the NFB (Sesha Sai et al, 2017;Singh et al, 2018;Saha and Sain, 2019;.…”

Section: Nellore Schist Belt (Nsb)mentioning

confidence: 99%

“…4). The slices of Kandra ophiolite complex and associated deep water pelagic chert and turbidites intercalated with pillowed metabasalts and sheeted dykes thrust within the amphibolitic schists and gneisses of Vinjamuru Group are interpreted to be remnants of oceanic back-arc crust (Saha and Sain, 2019). It has been suggested that the (arc-) oceanic realm in which they originated was at some distance from the eastern edge of the EDC before being tectonically transferred to their present location as imbricate thrust sheets.…”

Section: Ophiolitic Rocks From Nsbmentioning

confidence: 99%

“…We, consider them to be contiguous crustal blocks. This suggests that the CB, NFB and NSB are a collage of terranes separated by tectonic contacts that have an interlinked evolutionary history spanning the Late Paleoproterozoic to Neoproterozoic times (Tripathy et al, 2019;Saha and Sain, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Cuddapah Basin, India: A Collage of Proterozoic Subbasins and Terranes

Kale¹,

Saha²,

Patrabnis-Deb³

et al. 2020

PINSA

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The sedimentary sequences and associated magmatic rocks from the Cuddapah basin and adjoining fold belts on the eastern margin of the Dharwar craton of Peninsular India are repositories of several economic mineral deposits, including radioactive mineral deposits. Growing evidence suggests that the array of subbasins (on the western side), the Nallamalai Fold Belt, and the eastern Nellore Schist Belt represent independent terranes that were tectonically connected. Paleoproterozoic-Mesoproterozoic extensional passive margin development with the attached oceanic realm, followed by Mesoproterozoic collisional tectonics and a subsequent Neoproterozoic extensional regime resulted in the present configuration of this region. A review of recent publications suggests that several traditional views deserve to be modified. This region needs to be examined in light of the emerging models of Proterozoic supercontinental assembly and break-up. Open areas of debate and gaps in confirmatory evidence for such models are discussed to provide directions for future studies.

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Section: Nallamalai Fold Belt (Nfb)mentioning

confidence: 68%

Section: Nellore Schist Belt (Nsb)mentioning

confidence: 99%

Section: Nellore Schist Belt (Nsb)mentioning

confidence: 99%

Section: Ophiolitic Rocks From Nsbmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cuddapah Basin, India: A Collage of Proterozoic Subbasins and Terranes

Kale¹,

Saha²,

Patrabnis-Deb³

et al. 2020

PINSA

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Petrology and geochemistry of mafic dyke and sills in Cumbum Formation, of the Proterozoic Nallamalai fold belt, Rajampet area, Andhra Pradesh, India

Das

Chakraborty

2019

J Earth Syst Sci

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Intensely deformed Proterozoic Nallamalai fold belt (NFB) occupies the eastern part of undeformed, Proterozoic Cuddapah basin and is separated from Cuddapah basin by easterly dipping Rudravaram thrust line. Igneous activity in NFB is represented by intrusive syenite and lamproite dykes. This study brings out the petrological and geochemical character of unreported intrusive dolerite dykes and sills within the Cumbum Formation of NFB. The dykes are undeformed, whereas the sills suffered D1 phase of deformation, although both are petrologically and geochemically similar. The rocks are highly fractionated sub-alkaline tholeiite, consist mainly of clino-pyroxene and plagioclase. Chondritenormalised rare earth element (REE) plot shows enriched light rare earth element (LREE) and flat heavy rare earth element (HREE). A primitive mantle-normalised multi-element spider diagram shows troughs in Nb, Ta, Ti and Zr indicating subduction zone character. Tectonic discrimination plots indicate both within-plate and subduction zone environment of formation. Geochemical modelling also indicates enriched spinel peridotite as a probable source for dykes and sills. We suggest that the lithospheric mantle beneath NFB got enriched by subduction-derived fluid around 1.6 Ga, and in later stage, these dykes and sills were generated by extension of the enriched lithosphere at different phases in turn inheriting the subduction zone geochemical characters.

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Overlapping A-type and S-type characters in late- to post-tectonic granites – petro-tectonic evolution of late Mesoproterozoic Andhra Konda granite, Nellore Schist Belt, southern India

Sain

Saha

2022

J Earth Syst Sci

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Multiple convergences along an Archean craton margin: Clues from Proterozoic ophiolite remnants, granites and granulite domains along the SE margin of India

Cited by 9 publications

References 75 publications

Cuddapah Basin, India: A Collage of Proterozoic Subbasins and Terranes

Cuddapah Basin, India: A Collage of Proterozoic Subbasins and Terranes

Petrology and geochemistry of mafic dyke and sills in Cumbum Formation, of the Proterozoic Nallamalai fold belt, Rajampet area, Andhra Pradesh, India

Overlapping A-type and S-type characters in late- to post-tectonic granites – petro-tectonic evolution of late Mesoproterozoic Andhra Konda granite, Nellore Schist Belt, southern India

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