Subduction–collision processes and crustal growth in eastern Dharwar Craton: Evidence from petrochemical studies of Hyderabad granites

Pahari, Arijit; Prasanth, P; Mani, Devleena; Manikyamba, C.; Subramanyam, K.S.V.

doi:10.1007/s12040-019-1296-1

Cited by 10 publications

(3 citation statements)

References 107 publications

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“…7ab), suggesting a slight thickening of the MHT below the region. This slight thickening of the MTZ could be attributed to the presence of probable imprints of the Archean subduction below the Hyderabad region as proposed by Pahari et al (2020) based on petrochemical studies of Hyderabad granites.…”

Section: Resultsmentioning

confidence: 71%

Imaging of different crustal and mantle discontinuities below the Hyderabad, Eastern Dharwar Craton, India

Mandal

Gupta

Sivaram

et al. 2022

Preprint

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To monitor seismicity, a 10-station broadband seismic network was deployed in the Hyderabad region by CSIR-NGRI, Hyderabad, India, during 2020-21. The analysis of radial P receiver functions using data from this network detects conversions from five major crustal and mantle discontinuities below the region. Our CCP stacking of radial PRFs also images the nature and geometry of these seismic discontinuities viz., Moho (increase in positive amplitude at 30–40 km depths), Hales discontinuity (increase in positive amplitude at 90–120 km depths), lithosphere-asthenosphere boundary (LAB) (increase in negative amplitude at 130–160 km depths), 410-km (increase in positive PRF amplitude at 410–440 km depths) and 660-km (increase in positive PRF amplitude at 620–660 km depths). Our modeling also reveals that the mean depth to the Moho, Hales discontinuity and LAB below the study region are 36, 115 and 160 km, respectively, suggesting the absence of a thick cratonic root below the EDC. We also model the differential time of the 410-km and 660-km conversions, which is found to be 24 s at most of the stations that is the same as the theoretical differential time between these two phases according to the IASP91 global reference velocity model, indicating a typical cratonic behaviour of the EDC. However, a noticeable upward movement of the 410-km discontinuity and a slight downward movement of the 660-km discontinuity below the central part of the study region is also modelled that suggests a thickening of the Mantle transition zone, which could be attributed to the presence of probable imprints of the Archean subduction below the Hyderabad, EDC, India.

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Section: Resultsmentioning

confidence: 71%

Imaging of different crustal and mantle discontinuities below the Hyderabad, Eastern Dharwar Craton, India

Mandal

Gupta

Sivaram

et al. 2022

Preprint

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“…To comprehend their geological history and the nature of any genetic processes during their evolution, the tectonic context of the investigated trachyte is taken into account in light of their chemical data. Rb, U, Th, Nb, Ta, Y, Zr, and REE are quite plentiful in most Phanerozoic alkaline volcanic, and their rock types frequently display geochemical characteristics of within-plate magmatism (White and Urbanczyk 2001; Pahari et al 2020). In comparison to HREE, they are abundant in alkalis, Nb, Y, Zr, Rb, Ga, U, and Th (Tables 2 and 3).…”

Section: Discussionmentioning

confidence: 99%

Petrogenesis and geological implications of the trachytic rocks in the South Eastern Desert, Egypt: Mineralogical, geochemical, and radioactivity insights

Saleh,

Mohamed,

El Tohamy

2023

Applied Earth Science: Transactions of the Institutions of Mini

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The investigated Phanerozoic volcanic (Gabal Um Itly, G. El Beida, G. Um Domi and G. Um Doweila) areas in the south Eastern Desert of Egypt of the Northern Arabian-Nubian Shield (ANS), have been a peralkaline affinity and display a continuous composition trachyte rocks. Geochemically, the studied rocks show significant negative anomalies in Ba, Sr, and Ti on the primitive mantle normalized trace element plot, indicating an ancestry involving plagioclase and Fe-Ti oxide fractionation. The concentrations of uranium mineralization and rare earth elements in the trachyte rocks is related to the presence of uranophane, kasolite, umohoite, autunite, monazite and allanite. The distribution of uranium, thorium and their ratios in the trachyte rocks reflects a direct strong relation, which suggests that U distribution is, at least in part, governed primarily by magmatic processes and disturbed later by a hydrothermal solution.

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“…The crustal evolution pattern in the WDC is distinct from the CDC and the EDC as the last major tectonic event there occurred at 2.56-2.52 Ga involving both juvenile magmatism and reworking of crust producing sanukitoids and anatectic granites followed by the final cratonization at around 2.5 Ga (Dey et al, 2016;Jayananda et al, 2000;Krogstad, Hanson, & Rajamani, 1991Moyen et al, 2001Moyen et al, , 2003Pahari, Prasanth, Tiwari, Manikyamba, & Subramanyam, 2020). This widespread magmatism is possibly triggered by crustal thickening in a convergent orogenic setting (Dey et al, 2014;Mohan et al, 2020;Pahari et al, 2020). The generation of the Hosadurga granite occurred much before this and indicate that crustal reworking has either been a protracted process spanning at least 100 million years or has been taking place repeatedly during the Neoarchean.…”

Section: Crustal Reworking and Cratonization In The Wdcmentioning

confidence: 95%

Geochemical and isotopic studies of potassic granite from the western Dharwar Craton, southern India: Implications for crustal reworking in the Neoarchean

et al. 2021

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Chitradurga greenstone belt (CGB), part of the western Dharwar Craton (WDC), is studied for its petrogenesis. The combined field, petrographic, whole-rock elemental, and Nd-Sr isotope data of granite and associated Tonalite-Trondhjemite-Granodiorite (TTG) gneiss from this region are presented here. The granites are alkali-calcic to calc-alkalic in terms of modified alkali lime index (MALI) and are weaklyindicate that these are formed by the melting of TTG gneiss at depths above the garnet stability field. Isotopic data (ε Nd = −2.9 to −7.6 at T = 2,600 Ma, I Sr = 0.715-0.729, T DM > 3.0 Ga) also show the involvement of Archean crustal sources. Trace element modelling was carried out using non-modal equilibrium melting equation, which constraints partial melting of TTG source to a low degree (11%) for the formation of this granite. This model could also produce a major element composition consistent with this granite. The upper bounds on the magmatic temperatures (724-785 C) assessed from zircon saturation thermometry suggest that fluid influx is required. TTG samples show variable and very high positive epsilon Nd values (1.5-8.9), higher than the contemporaneous mantle, suggesting re-melting of mafic crust. The observed high Nd isotope ratios in TTG indicate involvement of a mafic source that formed as early as 3.8 Ga, probably as a result of global differentiation of the early Earth.

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Subduction–collision processes and crustal growth in eastern Dharwar Craton: Evidence from petrochemical studies of Hyderabad granites

Cited by 10 publications

References 107 publications

Imaging of different crustal and mantle discontinuities below the Hyderabad, Eastern Dharwar Craton, India

Imaging of different crustal and mantle discontinuities below the Hyderabad, Eastern Dharwar Craton, India

Petrogenesis and geological implications of the trachytic rocks in the South Eastern Desert, Egypt: Mineralogical, geochemical, and radioactivity insights

Geochemical and isotopic studies of potassic granite from the western Dharwar Craton, southern India: Implications for crustal reworking in the Neoarchean

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