40Ar/39Ar ages of mafic dykes from the Mesoproterozoic Chhattisgarh basin, Bastar craton, Central India: Implication for the origin and spatial extent of the Deccan Large Igneous Province

Rao, N. V. Chalapathi; Burgess, R.; Lehmann, Bernd; Mainkar, Datta; Pande, Swati; Hari, K.R.; Bodhankar, Ninad

doi:10.1016/j.lithos.2011.06.001

Cited by 39 publications

(10 citation statements)

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“…Granulites from Balaghat-Bhandara and Ramakona-Katangi Ganulite belts associated with Central Indian Suture (CIS) zone [41,28] and Bhopalpatnam and Karimnagar granulite belts are exposed in Western Bastar [36,[42][43][44][45][46]. Mafic dyke swarms of Bastar Craton include NWSE trending Keshkal swarm, Bhanupratappur swarm, Dantewara swarm, and Bastanar swarm, NNW-SSE trending Sonakhan swarm, N-S trending Lakhna dykes, ENE-WSW trending Bandimal dykes are well studied [11,22,42,[47][48][49][50][51][52][53][54][55][56][57]. Dongargarh, Malanjkhand, Abhujmar and Mul granites represent the diverse Proterozoic granites from Bastar Craton [37,56,[58][59][60][61][62].…”

Section: Regional Geologymentioning

confidence: 99%

“…Mafic and ultramafic magmatism poured mafic magma on the oceanic floor via the divergent plate boundaries, but rocks on the ocean floor are not older than 200 My [5,20,21]. Thus, we have to focus our studies on the continental crust, which preserves the oldest rocks to younger rocks produced at the continental arc, rift basins and LIPs [2,5].The Bastar Craton has preserved enormous dykes, dyke swarms and even major sills emplaced at deeper levels and now exposed along with the basement rocks as the supra crustal rocks have disappeared because of long term erosion [12,[22][23][24][25][26], although some of the supracrustal rocks including volcanic flows are preserved in the rift basins such as the Sakoli belt volcanics and Khairagarh supracrustal volcanics [22,27,28]. We present here new geochemical data (major, trace including rare earth elements (REE) on the mafic dykes from the Amgaon and Khairagarh regions of the Bastar Craton (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

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2022

AES

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The Bastar Craton of the southern part of Central Indian shield is endowed with the presence of magmatic rocks in form of mafic magmatism (dominantly dykes, dyke swarms and sills) in the areas where they are exposed along with the basement rocks (Amgaon and Tirodi gneissic complex). The equivalent volcanic rocks occur in the supracrustal belts, where the magmatic rocks are intercalated with sedimentary rocks, as observed for example in the Sakoli and Khairagarh supracrustal belts. The studied dyke samples show large variation from low silica to high silica variants, basaltic to andesitic/ rhyolitic in composition. The low silica samples are subdivided into low silica group I and II based on their distinct evolutionary trends on various bi-elemental plots and the incompatible trace elements ratios, including those for the rare earth elements. The observed chemical variations indicate that these samples were derived from distinct and/or mixed mantle sources from different depths. These samples were derived by varying degrees of partial melting followed by dominantly clinopyroxene, amphibole, plagioclase and to some extent olivine fractionation. The multi-elements patterns and various discriminant diagrams indicate that the studied samples were generated in a subduction environment giving rise to arc magmatism. The presence of dominantly dykes, dyke swarms and sills along with the basement rocks indicate that the study area has undergone deep erosion exposing the basement rocks and these magmatic bodies (dykes, dyke swarms and sills) actually represent the plumbing system for the mantle derived melts, which contributed significantly to the Precambrian crustal evolution processes in the Central Indian shield.

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Section: Regional Geologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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2022

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“…The Bastar Craton has a complex geological history and is dominated by 2.5-Ga granite gneisses hosting enclaves of 3.6 to 3.51 Ga of old tonalitetrondhjemite-granodiorite (TTGs), K-feldspar granites, amphibolites, and low-to high-grade supracrustal belts (Ghosh, 2004;Rajesh et al, 2009;Sarkar et al, 1993). Multiple episodes of Precambrian mafic magmatism formed dyke swarms, mafic volcanic rocks, and mafic dykes (Ramachandra, Mishra, & Deshmukh, 1995;Challapathi Rao et al, 2011;Srivastava & Gautam, 2009). The Western Bastar Craton occurring along the northern shoulder of Godavari Graben is dotted with numerous occurrence of base metal mineralization confined to NNW-SSE-to N-S-trending brittle shear zone/fault zone (Dora & Randive, 2015;Sashidharan, 2007).…”

Section: Geological Frameworkmentioning

confidence: 99%

Characterization of copper ± (gold) vein‐type mineralization along terrain boundary fault, Dubarpeth in Central India: Constraints from fluid inclusion, stable isotope, and in situ trace element geochemistry of sulphides

et al. 2019

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We present the findings on in situ trace element geochemistry of sulphides by LA-ICPMS, sulphur isotope, and hydrothermal fluid evolution of copper ± gold mineralization at Dubarpeth, Central India. Mineralization is associated with chloritizedsilicified alteration zones, structurally localized along the terrain boundary fault between Archean TTG quartz diorite (2.5 Ga) of Western Bastar Craton and Paleo-Mesoproterozoic cover sediments of Pranhita-Godavari (PG) Valley. Studies reveal that the Cu ± Au mineralization occurs in the form of dissemination, stringers, and veins along the microfaults and fractures. We infer three stages of mineralization based on the field observations and petrography studies. The early stage is characterized by the quartz-pyrite-chalcopyrite assemblage, while the middle stage is represented by quartz-chlorite-chalcopyrite ± pyrite. Calcite ± epidote is conspicuous in the late stage. Fluid inclusion microthermometry and Raman spectroscopy studies indicate that the early-stage veins are mainly aqueous rich, mixed carbonicaqueous, and minor vapour-rich aqueous inclusions. FIs in the early stage displayed evidence of vein formation during episode of fluid immiscibility with the homogenization temperatures and salinities up to 259°C and 27 wt.% NaCl equiv., respectively, indicating initial ore-forming fluids of moderate temperature, moderate to high salinity in H 2 O-CO 2 -NaCl systems. Copper mineralization stage is liquid-and vapour-rich (H 2 O-CO 2 -CH 4 + N 2 ) aqueous inclusions, with homogenization temperatures of 174-221°C and salinities of 6.37 to 13.9 wt.% NaCl equiv. This temperature range has been further supported by empirical chlorite thermometry based on Fe/Mg, Al IV , and Al V . The sulphur isotope values of pyrite and chalcopyrite showed δ 34 S interval of 2.29‰ to −10.85‰, characteristic of highly oxidized nature of the fluids and attributing sulphur source to magmatic origin. The ore-forming fluids gradually became SO 2− 4 enriched and relatively oxidized during Cu mineralization. High Co-Ni trace element signatures of pyrite by LA-ICPMS substantiate this observation, further indicating remobilization from a magmatic-hydrothermal fluid. The presence of CH 4 favours either a source of deep crustal nature or a mantle for the ore-

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“…The Deccan Large Igneous Province is one of the world's wellknown continental flood basalt provinces with an eruptive history in three main volcanic events at 69-67 Ma, 65 Ma and a terminal event at 61 Ma (e.g., Widdowson et al, 2000;Hofmann et al, 2000;Sheth et al, 2001;Chenet et al, 2007;Hooper et al, 2010;Lehmann et al, 2010;Chalapathi Rao et al, 2011b). Recent studies show that the bulk of Deccan volcanism ($80%) of the 3500 m of lava flows, erupted during less than 800 ky in magnetic polarity and was likely a major contributor to the mass extinction at K-T boundary (Saunders et al, 2007).…”

Section: Deccan Large Igneous Province the Associated Alkaline Magmamentioning

confidence: 99%

Petrogenesis of lamprophyres from Chhota Udepur area, Narmada rift zone, and its relation to Deccan magmatism

Rao

Das

2012

Journal of Asian Earth Sciences

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40Ar/39Ar ages of mafic dykes from the Mesoproterozoic Chhattisgarh basin, Bastar craton, Central India: Implication for the origin and spatial extent of the Deccan Large Igneous Province

Cited by 39 publications

References 90 publications

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Characterization of copper ± (gold) vein‐type mineralization along terrain boundary fault, Dubarpeth in Central India: Constraints from fluid inclusion, stable isotope, and in situ trace element geochemistry of sulphides

Petrogenesis of lamprophyres from Chhota Udepur area, Narmada rift zone, and its relation to Deccan magmatism

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