Early Precambrian mafic dyke swarms from the Central Archaean Bastar Craton, India: geochemistry, petrogenesis and tectonic implications

Srivastava, Rajesh K.; Gautam, Gulab C.

doi:10.1002/gj.1302

Cited by 25 publications

(12 citation statements)

References 62 publications

(139 reference statements)

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“…First, the existence of metasomatised mantle sources beneath the Bastar Craton, since the Palaeoproterozoic time or even earlier, has been proposed in several studies (e.g. Srivastava and Singh 2004;Hussain et al 2008;Subba Rao et al 2008;Srivastava and Gautam 2012), and hence, an active continental margin setting is not required for the genesis of the Lakhna dykes. Secondly, the sedimentary basins of the craton are satisfactorily explained as intracratonic rifts (Chaudhuri et al 2002;Patranabis-Deb and Chaudhuri 2007).…”

Section: Geodynamic Settingmentioning

confidence: 97%

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Sahu

Gupta²,

Patel³

et al. 2013

Proceedings of 10th International Kimberlite Conference

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This work presents the first mineralogical, geochemical and 40 Ar/ 39 Ar geochronological data on hypabyssal facies lamproites near Kalmidadar and Darlimunda in the Nuapada Lamproite Field of the Bastar Craton. The Kalmidadar lamproite is a diamondiferous intrusion with surface dimension of *320 m 9 160 m, whereas the Darlimunda lamproite is a dyke swarm comprising clusters of several narrow (\5 m wide) and elongated bodies. Indicator mineral suite around the Kalmidadar lamproite is marked by abundance of Cr-spinel, rarity of garnet and absence of Cr-diopside and picroilmenite. Mineralogically, the Kalmidadar lamproite comprises phenocrysts of olivine (pseudomorphed by calcite and talc) and microphenocrysts of phlogopite set in a groundmass of chlorite and calcite. The phlogopite is Ti rich (5.4-7.4 wt % TiO 2 ), and the relationship between its Ti content and octahedral site deficiency indicates two substitution mechanisms, viz. Ti + ' $ 2 Mg and Ti ? 2Al $ Mg ? 2Si. The Darlimunda lamproites have undergone pervasive hydrothermal and/or deuteric alteration, which has resulted in complete chloritisation of phlogopite and extensive silicification of the rocks. Tiny grains of rutile and apatite are commonly scattered in the groundmass of both Kalmidadar and Darlimunda lamproites. The Nuapada lamproites have high contents of compatible elements such as V, Cr and Ni and of incompatible elements such as Ba, Zr, Nb and Hf. They also show high abundance of REE and enrichment in LREE relative to HREE. The incompatible element distribution patterns of the lamproites are marked by Nb, Sr, P, Hf and Zr anomalies relative to REE. The observed petrological and geochemical characteristics of the Nuapada lamproites are consistent with the derivation of the magma from a metasomatised subcontinental lithospheric mantle source. Whole-rock 40 Ar/ 39 Ar isotopic data yields an age of 1055 ± 10 Ma for the Nuapada lamproites.

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Section: Geodynamic Settingmentioning

confidence: 97%

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Sahu

Gupta²,

Patel³

et al. 2013

Proceedings of 10th International Kimberlite Conference

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“…Rb, Sr and Ba are considered to be more mobile than Ti, Zr, Nb, Y and REE (Srivastava 2012). Zr is thought to be the most immobile element (Srivastava 2012). Present dyke and sills are not metamorphosed, but evidences of hydrothermal alteration are observed during petrographic study.…”

Section: Tectonic Setting Of Dyke and Sillsmentioning

confidence: 99%

“…Mobility of elements due to metamorphism and hydrothermal alteration is a problem in amphibolite facies metamorphic condition (Rajamani et al 1989;Vijay Kumar et al 2006). Rb, Sr and Ba are considered to be more mobile than Ti, Zr, Nb, Y and REE (Srivastava 2012). Zr is thought to be the most immobile element (Srivastava 2012).…”

Section: Tectonic Setting Of Dyke and Sillsmentioning

confidence: 99%

Petrology and geochemistry of mafic dyke and sills in Cumbum Formation, of the Proterozoic Nallamalai fold belt, Rajampet area, Andhra Pradesh, India

Das

Chakraborty

2019

J Earth Syst Sci

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Intensely deformed Proterozoic Nallamalai fold belt (NFB) occupies the eastern part of undeformed, Proterozoic Cuddapah basin and is separated from Cuddapah basin by easterly dipping Rudravaram thrust line. Igneous activity in NFB is represented by intrusive syenite and lamproite dykes. This study brings out the petrological and geochemical character of unreported intrusive dolerite dykes and sills within the Cumbum Formation of NFB. The dykes are undeformed, whereas the sills suffered D1 phase of deformation, although both are petrologically and geochemically similar. The rocks are highly fractionated sub-alkaline tholeiite, consist mainly of clino-pyroxene and plagioclase. Chondritenormalised rare earth element (REE) plot shows enriched light rare earth element (LREE) and flat heavy rare earth element (HREE). A primitive mantle-normalised multi-element spider diagram shows troughs in Nb, Ta, Ti and Zr indicating subduction zone character. Tectonic discrimination plots indicate both within-plate and subduction zone environment of formation. Geochemical modelling also indicates enriched spinel peridotite as a probable source for dykes and sills. We suggest that the lithospheric mantle beneath NFB got enriched by subduction-derived fluid around 1.6 Ga, and in later stage, these dykes and sills were generated by extension of the enriched lithosphere at different phases in turn inheriting the subduction zone geochemical characters.

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“…The igneous rocks are easily contaminated by wall rocks, especially at the plutonic margin (Bezard, Turner, Davidson, Macpherson, & Lindsay, 2015;Esna-Ashari, Tiepolo, Valizadeh, Hassanzadeh, & Sepahi, 2012;Kisters & Anhaeusser, 1995;Ng et al, 2015;Pesquera, Gilcrespo, Torresruiz, & Rodarobles, 2018;Stevenson et al, 2009), whereas the mafic-ultramafic magma has low viscosity, has rapid flow and cooling, and usually occurs as a narrow dyke. Contamination by the wall rocks is often neglected (Collerson & Sheraton, 1986;Srivastava & Gautam, 2012;Zhang et al, 2002). Because of the negligible assimilation, the maficultramafic dykes were often chosen as an ideal window to probe initial melt or primary magma from mantle (Bédard, 1993;Price, Russell, & Kopylova, 2000;Srivastava, Samal, & Gautam, 2015;Srivastava & Singh, 2004;Wang, Li, Wu, & Xie, 2014).…”

Section: Introductionmentioning

confidence: 99%

Assimilation of the mafic‐ultramafic magma: A case study of diabase dyke at the Beidaihe, North China Craton

Wang

et al. 2019

Geological Journal

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Assimilation serves as a significant part during magma's evolution. Because of rapid cooling of mafic-ultramafic magma, assimilation between mantle-derived magma and crustal rocks (wall rocks) is often neglected. The Beidaihe diabase dyke in North China Craton suggests that assimilation of the rapidly cooled mantle-derived magma cannot be ignored. The diabase dyke is very thin (~1 m in width) with chilled margin.The dyke centre is porphyritic texture while the chilled margin is aphanitic texture, suggesting a rapid crystallization process. From the centre to margin of the dyke, contents of SiO 2 (from 48.12-49.94 wt.% to 38.29-46.63 wt.%), MgO (from 7.46-9.17 wt.% to 3.39-4.71 wt.%), Ni (from 91.5-118 ppm to 6.5-45.8 ppm), and Cr (from 243-306 ppm to 1.7-80.5 ppm) are obviously decreased, but contents of Fe 2 O 3 T (from 8.71-9.39 wt.% to 9.21-12.30 wt.%), CaO (from 5.67-7.08 wt.% to 6.91-10.26 wt.%), and CO 2 (from 0.25-1.92 wt.% to 4.52-6.58 wt.%) are distinctly increased. The dyke intruded discordantly into Ordovician limestone. Limestone far away from the dyke mainly consists of micro calcites with low MgO (0.55-0.77 wt.%) and FeO (0.07-0.09 wt.%) but high CaO (53.82-55.51 wt.%) and CO 2 (44.46-45.02 wt.%) contents. Limestone close to the dyke metamorphosed into marble, which mainly comprises of recrystallized calcite/dolomite and diopside, with high MgO (1.85-2.35 wt.%) and FeO (0.17-1.36 wt.%) but relatively low wt.%) and CO 2 (38.77-41.04 wt.%). All these suggest an assimilation process of the mantle-derived magma with wall rocks limestone. Based on the chemical balance at the interface between the diabase and limestone, CO 2 exchange model is used to estimate the degree of assimilation. The calculated assimilation degree is about 8-12% at the dyke margin. There is obvious elements exchange between magma and wall rocks, and the transfer ability of Mg is greater than that of Ca. Meanwhile, Fe oxides quickly precipitated at the margins of the dyke for the increase of f O 2. Therefore, even for mantle-derived magma which chilled rapidly, it may also be obviously influenced by assimilation, especially when wall rocks are carbonate sediments. Simultaneously, this study provides a possible explanation for some mantlederived rocks in carbonate areas with high LOI.

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Early Precambrian mafic dyke swarms from the Central Archaean Bastar Craton, India: geochemistry, petrogenesis and tectonic implications

Cited by 25 publications

References 62 publications

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Petrology of Lamproites from the Nuapada Lamproite Field, Bastar Craton, India

Petrology and geochemistry of mafic dyke and sills in Cumbum Formation, of the Proterozoic Nallamalai fold belt, Rajampet area, Andhra Pradesh, India

Assimilation of the mafic‐ultramafic magma: A case study of diabase dyke at the Beidaihe, North China Craton

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