P-T-t evolution of sapphirine-bearing semipelitic granulites from Vadkampatti in Eastern Madurai Domain, southern India: Insights from petrography, pseudosection modelling and in-situ monazite geochronology

Tiwari, Ashish K.; Sarkar, Tapabrato

doi:10.1016/j.precamres.2020.105866

Cited by 16 publications

(34 citation statements)

References 101 publications

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“…The Northern granulite terrane is dominated by felsic orthogneisses with enclaves of mafic-ultramafic rocks and F I G U R E 1 Geological map of Southern India (simplified from Geological Survey of India map published in 1995; Plavsa et al, 2014;Tiwari & Sarkar, 2020) showing major crustal blocks (CH, Cardamom Hills; DUC, Devanur Ophiolite Complex; MM, Madras Massif; NB, Nagercoil Block; NH, Nilgiri Hills; TB, Trivandrum Block), shear zones (KKPTSZ, Karur-Kambam-Painavu-Trissur Shear Zone; MASSZ, Moyar-Attur-Salem Shear Zone; PCSS, Palghat Cauvery Shear System; SSZ, Suruli Shear Zone) and reported UHT localities. Major shear zones adopted from Brandt et al (2014) [Colour figure can be viewed at wileyonlinelibrary.com] metasedimentary formations, recording Late Archean-Early Palaeoproterozoic metamorphism (3.1-2.48 Ga) (Clark et al, 2009;Ghosh et al, 2004;Saitoh, Tsunogae, Santosh, Chetty, & Horie, 2011).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…In contrast, the Southern Granulite Terrane (SGT) experienced the last high-grade metamorphism during the Late Neoproterozoic to Early Cambrian (550-500 Ma) (e.g. Brandt et al, 2011Brandt et al, , 2014Braun, Montel, & Nicollet, 1998;Clark et al, 2015;Kooijman et al, 2011;Plavsa et al, 2012;Prakash et al, 2017;Raith, Srikantappa, Buhl, & Koehler, 1999;Sengupta et al, 2015;Tiwari & Sarkar, 2020). The Northern and the Southern Granulite Terranes are separated by a >100 km wide zone of E-W trending shear zones, known as the Palghat Cauvery Shear System (PCSS) (Collins et al, 2014;Drury et al, 1984).…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The last phase of metamorphism is UHT where the inferred peak conditions are in the range of 950-1,050 C at 10-12 kbar. The UHT conditions are primarily reported from sapphirine-bearing Mg-Al rich metapelitic granulites in Perumalmalai (Prakash & Arima, 2003;Raith et al, 1997), Palani hills (Brandt et al, 2011), Karur (Sato & Santosh, 2007) and Komiloothu (Sato et al, 2009), Komateri (Tsunogae et al, 2008), Malapatty (Tsunogae & Santosh, 2003), Lachmanapatti (Tsunogae & Santosh, 2003), Sengal , Kiranur (Lal, Ackermand, Raith, Raase, & Seifert, 1984), Sakkarakottai , Usilampatti (Prakash et al, 2017), Ganguvarpatti (Kondou, Tsunogae, Santosh, & Shimizu, 2009), Vadakkampatti (Tiwari & Sarkar, 2020) and Rajapalyam. In comparison, only a few UHT conditions are reported from mafic granulites (Prakash et al, 2007(Prakash et al, , 2010.…”

Section: Geological Backgroundmentioning

confidence: 99%

“…The Madurai Block consists of enormous volumes of pyroxenebearing granitoids of varying grain sizes and garnet-bearing quartzofeldspathic rocks (leptynites) with enclaves of migmatitic metapelites of metre scale (Figure 2a) and minor enclaves of mafic granulites (Figure 2b). For further details, refer to Tiwari and Sarkar (2020). The mafic granulites, occurring as enclaves within leptynites, are collected from an exposure near the Vadkkampatti village on the SW outskirts of Madurai city (9 54.78 0 N, 77 55.70 0 E) (Figure 1).…”

Section: Field Relationship and Petrographymentioning

confidence: 99%

“…The apparent discrepancy in the peak metamorphic temperatures could be attributed to fast retrograde Fe-Mg re-equilibration that obliterated the original composition. The mafic granulite samples of this study are chosen from the Vadkampatti village near Madurai city (Figure 1), where UHT conditions are reported from sapphirine-bearing semipelitic granulites (Tiwari & Sarkar, 2020).…”

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confidence: 99%

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Ultrahigh‐temperature mafic granulites from the Madurai Block, southern India: Constraints from conventional thermobarometry, pseudosection analysis, and rare earth element‐based thermometry

2021

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Ultra-high temperature (UHT) regional metamorphism is the most extreme form of crustal metamorphism with temperatures exceeding 900 C at moderate pressures of 7-13 kbar (Harley, 1998). UHT crustal metamorphism has so far been recognized from more than 50 localities worldwide (compiled in Kelsey, 2008;Kelsey & Hand, 2015), presenting a very exciting phenomenon, as it implies that the Earth's crust is mechanically capable of attaining and withstanding extreme thermal conditions on a regional scale (Harley, 2004;Kelsey, 2008) during 'normal' tectonic events. Although UHT metamorphism is now considered normal in the continuum of regional crustal processes, the number of occurrences is extremely low compared to the extent of metamorphic rock exposures, possibly because of the difficulty of its preservation and recognition in the rock record (cf. Kelsey & Hand, 2015).UHT metamorphism is classically recognized on the basis of diagnostic mineral assemblages such as Spr + Qz, Spl + Qz, Opx + Sil + Qz, Osm, etc., that typically develops in a Mg-Al rich metapelitic granulite (Harley, 1998;Kelsey & Hand, 2015). On the contrary, the most common mineral assemblage in mafic granulites is Opx + Cpx + Pl ± Grt, which has a broad stability range and, therefore, not diag-

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Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Geological Backgroundmentioning

confidence: 99%

Section: Field Relationship and Petrographymentioning

confidence: 99%

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confidence: 99%

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Ultrahigh‐temperature mafic granulites from the Madurai Block, southern India: Constraints from conventional thermobarometry, pseudosection analysis, and rare earth element‐based thermometry

2021

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Multi‐stage metamorphism of ultrahigh‐temperature Mg‐Al granulites during Gondwana assembly: Evidence from southern India

Santosh

Tsunogae

et al. 2022

Geological Journal

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The Southern Granulite Terrane (SGT) in India hosts granulite facies rocks metamorphosed at ultra-high temperature (UHT) conditions in the various crustal blocks, as well as within the Palghat-Cauvery Suture Zone (PCSZ), that is considered as a trace of the Late Neoproterozoic-Cambrian Gondwana suture. Here we investigate UHT granulites from the northern margin of the Madurai Block adjacent to the PCSZ where Mg-Al-rich granulites are exposed. We identify sodic gedrite + kyanite in these rocks as the high-pressure prograde stage assemblage, followed by sillimanitegarnet-orthopyroxene that formed during pressure decrease and temperature increase. The rare remnant gedrite is also stable at the near-peak UHT metamorphism until it was replaced by sapphirine. The rocks subsequently underwent decompression that formed sapphirine + cordierite and sapphirine + plagioclase symplectite around sillimanite. Dehydration during decompression generated orthopyroxene-sillimanite-quartz assemblage with the appearance of sapphirine, defining the diagnostic mineral assemblage indicative of peak UHT metamorphism (T > 900 C) at relatively high-pressure (P > 9 kbar). The UHT peak metamorphism in this region is consistent with the results of P-T calculations using conventional geothermometers and phase equilibrium modelling (T up to 1,050 C, P over12 kbar). Zircon and monazite geochronology on the UHT metapelites indicate distinct stages. Detrital zircon grains in the metasediments indicate protolith from ca. 2.5 Ga igneous source and the metamorphic overgrowths yield 206 Pb/ 238 U mean ages concentrated at ca. 550-520 Ma. Monazite ages define another younger group 206 Pb/ 238 U mean ages at ca. 450 Ma. The prograde high-pressure granulite-facies metamorphism and following UHT event correlate with the subduction-collision tectonics at 550-500 Ma associated with the final stage of amalgamation of the Gondwana supercontinent, while the 420-460 Ma monazite age records a later hydration at the postorogenic stage, possibly associated with deep shearing and fluid influx.

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Chemical dating of monazite: Testing of analytical protocol for U–Th–total Pb using CAMECA SXFive tactis EPMA at the National Centre for Earth Science Studies, Thiruvananthapuram, India

et al. 2021

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Major and trace element analyses of monazite by electron probe microanalyzer (EPMA) are routinely carried out for several decades. U-Th-total Pb method of monazite dating is currently considered as a reliable and acceptable tool to decipher the time of geological events. The purpose of the present study is to establish the quantiBcation conditions of monazite chronology using SXFive tactis EPMA, recently installed at the National Centre for Earth Science Studies, Thiruvananthapuram, India. Consistency in the chemical-chronological data of the monazites starting from the chronologically well-constrained Maocyr monazite data followed by the analysis of monazite from the garnet-cordierite gneiss of the Kerala Khondalite Belt conBrms the reliability of the NCESS-EPMA facility for the U-Th-total Pb chemical age dating of monazite. By applying the same analytical setup of chemical dating, the monazites from metapelites of Madurai Block of Southern Granulite Terrain, India yield two peak ages in probability density diagram of ca. 505 Ma and ca. 590 Ma (23 spots) which is similar to the 206 Pb/ 238 U age (ca. 506 Ma and ca. 585 Ma; 34 spots) obtained by LA-ICPMS.

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P-T-t evolution of sapphirine-bearing semipelitic granulites from Vadkampatti in Eastern Madurai Domain, southern India: Insights from petrography, pseudosection modelling and in-situ monazite geochronology

Cited by 16 publications

References 101 publications

Ultrahigh‐temperature mafic granulites from the Madurai Block, southern India: Constraints from conventional thermobarometry, pseudosection analysis, and rare earth element‐based thermometry

Ultrahigh‐temperature mafic granulites from the Madurai Block, southern India: Constraints from conventional thermobarometry, pseudosection analysis, and rare earth element‐based thermometry

Multi‐stage metamorphism of ultrahigh‐temperature Mg‐Al granulites during Gondwana assembly: Evidence from southern India

Chemical dating of monazite: Testing of analytical protocol for U–Th–total Pb using CAMECA SXFive tactis EPMA at the National Centre for Earth Science Studies, Thiruvananthapuram, India

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