Neoarchean microblock amalgamation in southern India: Evidence from the Nallamalai Suture Zone

Li, Shanshan; Santosh, M.; Ganguly, Sohini; Thanooja, P.V.; Sajeev, K.; Pahari, Arijit; Manikyamba, C.

doi:10.1016/j.precamres.2018.05.017

Cited by 33 publications

(14 citation statements)

References 72 publications

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“…As stated earlier, several authors advocated plate tectonics and terrane assembly models (Drury et al, 1984;Chadwick et al, 2002Chadwick et al, , 2007Reddy et al, 2003;Chardon et al, 2011;Jayananda et al, 2013a;Vijaya Rao et al, 2015a;Santosh et al, 2015;Mandal et al, 2018;Shan-Shan Li et al, 2018;Jayananda et al, 2018 among others). Some authors suggested mixed mode (plume and plate) tectonic mechanisms for the Neoarchean crustal evolution of the craton (Chardon et al, 1998;Harish Kumar et al, 2003;Jayananda et al, 2000;Manikyamba and Kerrich, 2012).…”

Section: The Post-30 Ga Crust: Plate Tectonics and Terrane Assemblymentioning

confidence: 97%

“…Elsewhere in the SGT, much of the crustal growth is ascribed to Neoarchean (ca. 2.70-2.50 Ga) accretionary processes, broadly contemporaneous with those in the WDC and EDC (Praveen Kumar et al, 2014;Ratheesh Kumar et al, 2016;Santosh et al, 2016;Shan-Shan Li et al, 2018). The entire Dharwar craton (WDC, EDC and the northern parts of the SGT) was finally shaped by the end Archean thermo-tectonic event(s) (D 2 M 2 ) around ca.…”

Section: Figure 2: a Schematic Of Correlation Of Sgt And Eggt With Grmentioning

confidence: 99%

“…Also in the SGT, felsic orthogneisses (charnockite gneiss) from the Sheveroy or Salem block yield U-Pb zircon ages of ca. 2.76-2.53 Ga (Clark et al, 2009;Peucat et al, 2013;Glorieet al, 2014;Shan-Shan Li et al, 2018). Shan-Shan summarised evidence for episodic juvenile crust formation between 3.3 and 2.7 Ga followed by crustal reworking and high-grade metamorphism in a continental arc around 2.5-2.46 Ga.…”

Section: Post 30 Ga Crust: the Neoarchean Orogenymentioning

confidence: 99%

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A Review of Paleo- to Neoarchean crustal evolution in the Dharwar craton, Southern India and the transition towards a Plate Tectonic regime

et al. 2020

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Section: The Post-30 Ga Crust: Plate Tectonics and Terrane Assemblymentioning

confidence: 97%

Section: Figure 2: a Schematic Of Correlation Of Sgt And Eggt With Grmentioning

confidence: 99%

Section: Post 30 Ga Crust: the Neoarchean Orogenymentioning

confidence: 99%

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A Review of Paleo- to Neoarchean crustal evolution in the Dharwar craton, Southern India and the transition towards a Plate Tectonic regime

et al. 2020

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“…Precambrian continental crust was built through the accretion of arc magmas at subduction–collision zones along active continental margins and accretion of island arc and oceanic plateaus. Mantle plume activities in terms of ocean island basalts (OIB), oceanic plateau basalts (OPB), continental flood basalts, (CFB) and underplating of mantle‐derived melts beneath the lower crust mostly resulted in vertical crustal growth (Bédard, ; Condie, ; Li, Santosh, Ganguly, et al, ; Turkina & Nozhkin, ; Wyman, ). Precambrian ultramafic–mafic rock suites represent major thermal events in the evolutionary history of the Earth with dynamic mantle melting processes.…”

Section: Introductionmentioning

confidence: 99%

Evolution of a Mesoarchean suprasubduction zone mantle wedge in the Dharwar Craton, southern India: Evidence from petrology, geochemistry, zircon U–Pb geochronology, and Lu–Hf isotopes

et al. 2019

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Petrological, geochemical, and zircon U–Pb geochronological features of Archean ultramafic–mafic complexes formed in subduction‐related settings provide significant insights into mantle source and geodynamic processes associated with subduction–accretion‐collision events in the early Earth. Here, we investigate a suite of serpentinized dunite, dunite, pyroxenite, and clinopyroxenite from an ultramafic complex along the collisional suture between the Western Dharwar Craton (WDC) and the Central Dharwar Craton (CDC) in southern India. We present petrology, mineral chemistry, zircon U–Pb geochronology, rare earth element (REE), Lu–Hf isotopes, and whole‐rock geochemistry including major, trace element, and platinum‐group element (PGE) data with a view to investigate the magmatic and metasomatic processes in the subduction zone. Mineral chemistry data from chromite associated with the serpentinised ultramafic rocks show distinct characteristics of arc‐related melt. Zircon U–Pb data from the ultramafic suite define different age populations, with the oldest ages at 2.9 Ga, and the dominant age population showing a range of 2.8–2.6 Ga. The early Paleoproterozoic (ca. 2.4 Ga) metamorphic age is considered to mark the timing of collision of the two WDC and CDC. Zircon REE patterns suggest the involvement continental crust components in the magma source. Zircon Lu–Hf analysis yields both positive and negative εHf(t) values from −3.9 to 1.5 with Hf‐depleted model ages (TDM) of 3,041–3,366 Ma for serpentinised dunite and −0.2–2.0 and 2,833–2,995 Ma for pyroxenite, suggesting that the magma was sourced from depleted mantle and was contaminated with the ancient continental crust. Geochemical data show low MgO/SiO2 values and elevated Al2O3/TiO2 ratios, implying subduction‐related setting. The serpentinized dunites and dunites show mild LREE enrichment over HREE, with relatively higher abundance of LILE (Ba, Sr) and depletion in HFSE (Nb, Zr), suggesting fluid–rock interaction, melt impregnation, and refertilization processes. The PGE data suggest olivine, chromite, and sulphide fractionations associated with subduction processes. Our study on the Mesoarchean to Neoarchean ultramafic complex provides important insights to reconstruct the history of the crust–mantle interaction in an Archean suprasubduction zone mantle wedge.

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“…The microblocks north of the PCSZ are transected by the Bhavani, Moyar, Nallamalai, Mercara, Kollegal, Salem–Attur, and Mettur Suture Zones. For example, the Eoarchean to Neoarchean Coorg Block is separated from the Dharwar Craton by the NW–SE‐trending Mercara Suture Zone, whereas the Nilgiri Block and the Coorg Block by the WNW–ESE‐trending Moyar Suture Zone (Figure ; Krishnaraj, Janardhan, & Basavalingu, ; Meißner, Deters, Srikantappa, & Köhler, ; Chetty et al, ; Ishwar‐Kumar et al, ; Ishwar‐Kumar et al, ; Santosh, Yang, Shaji, et al, , Santosh et al, ; Drury & Holt, ; Drury et al, ; Amaldev, Santosh, Tang, Baiju, & Tsunogae, ; Li et al, ). The Bhavani Suture Zone (BSZ), which is located south of the Nilgiri Block, exposes various orthogneisses such as hornblende‐biotite gneiss, amphibolite, mafic granulite, charnockite, mafic–ultramafic bodies, and suprasubduction‐type ophiolite suites (Bhaskar Rao, Chetty, Janardhan, & Gopalan, ; Santosh et al, 2013; Shaji et al, ).…”

Section: Introductionmentioning

confidence: 99%

Neoarchean arc magmatism and Paleoproterozoic granulite‐facies metamorphism in the Bhavani Suture Zone, South India

et al. 2019

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The Bhavani Suture Zone in the Southern Granulite Terrane marks the zone of amalgamation of the Neoarchean Nilgiri Block and the northwestern Madurai Block in southern India. Here, we report detailed petrological, geochemical, and geochronological data on the Mettupalayam mafic-ultramafic complex within this suture zone with a view to evaluate the tectonothermal history of the Bhavani Suture Zone and adjoining crustal blocks. The metamorphosed complex includes charnockite, hornblendebiotite gneiss, mafic granulite, amphibolite, garnet-bearing mafic granulite, and dioritic gneiss along with metamorphosed banded iron formation. The mafic granulite and the dioritic gneiss occur as concordant layers of varying thickness within the hornblendebiotite gneiss. The salient geochemical features of the mafic granulite and the dioritic gneiss including the enrichment of large-ion lithophile elements and depletion of highfield-strength elements suggest a subduction-related arc magmatic setting. However, the amphibolites show MORB-related affinity, suggesting its formation from a N-MORB-related source and their accretion together with the overlying banded iron formation. The peak metamorphic conditions of the garnet-bearing mafic granulite were estimated using conventional geothermobarometers as 800-820°C/8.5-9.2 kbar, which we further confirm through phase equilibrium modelling in the Na 2 O-CaO-K 2 O-FeO-MgO-Al 2 O 3 -SiO 2 -H 2 O-TiO 2 -Fe 2 O 3 (NCKFMASHTO) system. Magmatic zircons with high Th/U ratio from the amphibolite display a well-defined discordia with an upper intercept age of 2,600 ± 38 Ma. Zircon grains from the dioritic gneiss show weighted mean 206 Pb/ 207 Pb age of 2,524 ± 6 Ma from concordant zircon spots and a comparable upper intercept age of 2,562 ± 34 Ma from discordant zircon spots, indicating protolith emplacement related to Neoarchean arc magmatism as inferred from our geochemical data. The thin overgrowth rims around the magmatic zircon grains in the amphibolite yielded an upper intercept age of 2,520 ± 20 Ma, which is comparable with the protolith crystallization age of the dioritic gneiss. Slightly younger weighted mean 207 Pb/ 208 Pb ages of 2,463 ± 27 Ma (from dioritic gneiss) and 2,422 ± 30 Ma (from amphibolite) are also obtained from the metamorphic zircon rims. These ages are correlated to the timing of high-grade metamorphism associated with final collision of the Nilgiri Block and the northwestern Madurai Block. Similar Neoarchean-Paleoproterozoic magmatism and high-grade metamorphism were

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Neoarchean microblock amalgamation in southern India: Evidence from the Nallamalai Suture Zone

Cited by 33 publications

References 72 publications

A Review of Paleo- to Neoarchean crustal evolution in the Dharwar craton, Southern India and the transition towards a Plate Tectonic regime

A Review of Paleo- to Neoarchean crustal evolution in the Dharwar craton, Southern India and the transition towards a Plate Tectonic regime

Evolution of a Mesoarchean suprasubduction zone mantle wedge in the Dharwar Craton, southern India: Evidence from petrology, geochemistry, zircon U–Pb geochronology, and Lu–Hf isotopes

Neoarchean arc magmatism and Paleoproterozoic granulite‐facies metamorphism in the Bhavani Suture Zone, South India

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