Geochemical evolution of the Mangalwar Complex, Aravalli Craton, NW India: Insights from elemental and Nd-isotope geochemistry of the basement gneisses

Ahmad, Iftikhar; Mondal, M. E. A.; Bhutani, Rajneesh; Satyanarayanan, M.

doi:10.1016/j.gsf.2017.07.003

Cited by 24 publications

(19 citation statements)

References 64 publications

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“…The BGC has been divided into two domains, the BGC-I exposed south and east of Nathdwara town (Figure 1b), and the BGC-II north of it, on the basis of rock types, metamorphic grade, and protolith and metamorphic ages (e.g., Gupta, 1934;Heron, 1953). The domain BGC-I is the Archaean basement of the Aravalli Craton; it is dominated by Ga) gneisses (many of which are TTG gneisses) with several generations of amphibolites (e.g., Ahmad et al, 2018;Gopalan et al, 1990;Kaur et al, 2019;Roy & Kröner, 1996). It also contains many Neoarchaean (ca.…”

Section: Geological Background and Field Relationshipsmentioning

confidence: 99%

“…The domain BGC‐I is the Archaean basement of the Aravalli Craton; it is dominated by Palaeo‐ to Mesoarchaean (ca. 3.3–2.7 Ga) gneisses (many of which are TTG gneisses) with several generations of amphibolites (e.g., Ahmad et al, 2018; Gopalan et al, 1990; Kaur et al, 2019; Roy & Kröner, 1996). It also contains many Neoarchaean (ca.…”

Section: Geological Background and Field Relationshipsmentioning

confidence: 99%

“…The Aravalli Craton of the northwestern Indian Shield exposes a well‐preserved Archaean basement in its central and southern parts, known as the Banded Gneissic Complex (BGC, Gupta, 1934; Heron, 1953). This basement has been affected by repeated deformation, metamorphism, and granitic magmatism for much of its geological history (e.g., Ahmad, Mondal, Bhutani, & Satyanarayanan, 2018; Ahmad, Mondal, & Satyanarayanan, 2019; Bhowmik, Bernhardt, & Dasgupta, 2010; Buick et al, 2010; D'Souza et al, 2019; Dey et al, 2019; Fareeduddin & Banerjee, 2020; Gopalan, Macdougall, Roy, & Murali, 1990; Kaur et al, 2019; Rahaman, Mondal, Ahmad, Bhutani, & Choudhary, 2019; Roy & Kröner, 1996; Roy, Kröner, Rathore, Laul, & Purohit, 2012; Wiedenbeck et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

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Neoarchaean crustal reworking in the Aravalli Craton: Petrogenesis and tectonometamorphic history of the Malola granite, Bhilwara area, northwestern India

D’Souza

Sheth

et al. 2020

Geological Journal

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The Banded Gneissic Complex of the Aravalli Craton of northwestern India comprises Palaeo‐ to Neoarchaean (3.3–2.7 Ga) gneisses, including tonalite–trondhjemite–granodiorite (TTG) gneisses, intruded by Neoarchaean (2.6–2.5 Ga) TTGs, sanukitoids, and potassic granites. The latter include the Malola granite that crops out near Bhilwara and forms the basement for the Mesoproterozoic Pur‐Banera mineralized belt. The granite has experienced three deformation events, represented by an S1 foliation and superimposed open folds and dextral shears. Textural evidence and thermobarometry indicate that prograde metamorphism initially forming actinolite and subsequently diopside, and culminating in the upper amphibolite facies, was followed by retrograde metamorphism in the greenschist facies with fluid influx, forming zoisite. Zircon geochronology yields a crystallization age of 2,538 ± 11 Ma and indicates a prominent metamorphic overprint in the region at 1,307 ± 9 Ma. The Malola granite has low Sr–Nd isotopic ratios, enrichments in fluid‐mobile elements (Cs, Rb, Ba, Th, and Pb), and depletions in alteration‐resistant elements (Nb, Ta, and Ti). These characteristics combined with mineralogical evidence suggest that the granite was derived by anatexis of older crystalline crust (possibly granulitic lower crust) in the same subduction zone setting inferred previously for other Neoarchean granitoids in this region. Geochemical and Sr–Nd–Hf isotopic similarities between the Malola granite and Neoarchaean granitoids of the Aravalli, Bundelkhand, Bastar, Dharwar, and Congo cratons indicate a major role for anatectic crustal reworking in their genesis.

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Section: Geological Background and Field Relationshipsmentioning

confidence: 99%

Section: Geological Background and Field Relationshipsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neoarchaean crustal reworking in the Aravalli Craton: Petrogenesis and tectonometamorphic history of the Malola granite, Bhilwara area, northwestern India

D’Souza

Sheth

et al. 2020

Geological Journal

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“…Interestingly, the compositions of the Kaimur Group of rocks from the CVV overlap with the compositions of global TTGs (data compiled fromHalla et al, 2009;Moyen and Martin, 2012). These rocks also show similar geochemical signature of local basements rocks (Banded Gneissic Complex and Berach Granitoids)(Ahmad et al, 2018;Mondal and Raza, 2013). (d) In the plot of ε Nd(t) vs. Th/Sc (modified afterMcLennan et al, 1995), compositions of most CVV and SVV siliciclastic rocks overlap with that of recycled upper crust with Th/Sc >1.…”

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confidence: 78%

A combined geochemical, Nd, and stable Ca isotopic investigation of provenance, paleo-depositional setting and sub-basin connectivity of the Proterozoic Vindhyan Basin, India

Basu

Banerjee

Chakrabarti

2021

Lithos

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Trace elements and Nd and Ca isotopesGeochemical and isotopic investigation of Proterozoic clastic and chemical sedimentary rocks provide insights into surface conditions of the early Earth. The mid-Proterozoic Vindhyan Basin of central India, comprising 5 km thick, mostly undeformed and unmetamorphosed clastic and chemical sediments, is one such archive which is exposed in two sub-basins, the Son Valley Vindhyan sub-basin in the east (SVV) and Chambal Valley Vindhyan sub-basin in the west (CVV). Geochemical and Nd isotopic compositions of siliciclastic sedimentary rocks from the CVV sub-basin are reported in order to understand the provenance of the Vindhyan sediments in this sub-basin and the results are compared with the provenance of the sediments exposed in the SVV subbasin to evaluate whether the two sub-basins had shared a common provenance. Elemental ratios, such as Th/Co, La/Sc suggest that the clastic sedimentary rocks from the CVV have dominantly upper crustal silicic/felsic provenances and are broadly similar to those of equivalent stratigraphic horizons from the SVV. Initial Nd isotopic composition (ε Nd(t) ) of the siliciclastic rocks from the Lower Vindhyans of the CVV, calculated at their respective times of deposition, suggest sediment derivation from the Banded Gneissic Complex, Berach Granitoids, 1.82 Ga continental arc granitoids of the Aravalli Range and the Hindoli Volcanics. In contrast, the ε Nd(t) values of the Upper Vindhyan siliciclastics suggest that the Delhi Belt granitoids were the primary source of detritus during the deposition of these sediments. Paleo-depositional environment and connectivity between the SVV and CVV sub-basins are evaluated using geochemical, radiogenic Nd, and stable Ca isotopic compositions of carbonates from both sub-basins. Non-redox sensitive REY anomalies and Y/Ho ratios of carbonates from the two subbasins suggest deposition in an epeiric sea with limited connection to the open ocean. Neodymium isotopic compositions of the carbonate units suggest that the two sub-basins were connected during the deposition of both Lower and Upper Vindhyan sediments. Carbonates from both sub-basins record a significant shift towards more radiogenic Nd isotopic compositions around 1.6 Ga, possibly as a result of an Andean-type arc magmatism in near vicinity of the Son Valley sub-basin. The δ 44/40 Ca compositions of the SVV carbonates are typically lower than the CVV carbonates. This difference is likely due to greater freshwater input in the SVV sub-basin which is consistent with the existence of paleo-gradients in the Vindhyan Basin.

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“…(a) to (d) Average Chondrite‐normalized REE patterns for Shimla and Chail meta‐sediments (Ahmad, Mondal, Bhutani, & Satyanarayanan, 2018; Ahmad, Mondal, & Satyanarayanan, 2019; Joshi et al, 2017; Rahaman & Mondal, 2015; Singh et al, 2020)…”

Section: Discussionmentioning

confidence: 99%

Geochemistry of meta‐sediments from Neoproterozoic Shimla and Chail Groups of Outer Lesser Himalaya: Implications for provenance, tectonic setting, and paleo‐weathering conditions

et al. 2021

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The depositional history of the Himalayas has been overprinted by the tectonic activities during the Himalayan Orogeny. A detailed investigation of the sedimentary units can provide crucial information regarding their depositional history and provenance.This study aims at constraining the weathering history, tectonic setting, and provenance of meta-sediments from the Shimla and Chail Groups of Outer Lesser Himalaya. With similar major element chemistry, these meta-sediments comprise a low-silica group (avg. SiO 2 /Al 2 O 3 <3.29). Weathering intensity parameters chemical index of alteration (CIA), plagioclase index of alteration (PIA) and index of chemical variability (ICV) range from 62 to 78 (avg. = 69.41), 70 to 96 (avg. = 85.34), and 0.45 to 1.45 (avg. = 1.01), respectively indicating moderate to severe degrees of weathering. Transition element ratios [Cr/V (1.68-5.18), Ni/Co (1.47-30.99), and V/Ni (0.87-4.61)], and trace element bivariate plots suggest a recycled, felsic to intermediate provenance that has primarily been derived from Post-Archean sources with minor inputs from Archean units. A passive margin depositional setting with arcderived sources is suggested for the Chail and Shimla meta-sediments. Rare-earth element patterns reveal similarities between the studied metasediments with TTG gneisses and sanukitoids from the Aravalli and Bundelkhand Cratons, as well as Chaur and Jutogh granitoids. Therefore, Neoproterozoic Himalayan granitoids and ArcheanAravalli-Bundelkhand granitoids (TTGs and high-K granitoids) could be potential sources of these meta-sediments, as also suggested by the detrital zircon age distribution from the Beas-Satluj-Pabbar valleys and Shimla Group.

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Geochemical evolution of the Mangalwar Complex, Aravalli Craton, NW India: Insights from elemental and Nd-isotope geochemistry of the basement gneisses

Cited by 24 publications

References 64 publications

Neoarchaean crustal reworking in the Aravalli Craton: Petrogenesis and tectonometamorphic history of the Malola granite, Bhilwara area, northwestern India

Neoarchaean crustal reworking in the Aravalli Craton: Petrogenesis and tectonometamorphic history of the Malola granite, Bhilwara area, northwestern India

A combined geochemical, Nd, and stable Ca isotopic investigation of provenance, paleo-depositional setting and sub-basin connectivity of the Proterozoic Vindhyan Basin, India

Geochemistry of meta‐sediments from Neoproterozoic Shimla and Chail Groups of Outer Lesser Himalaya: Implications for provenance, tectonic setting, and paleo‐weathering conditions

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