Geochemistry and petrogenesis of syenites and associated rocks of the Elagiri complex, Southern Granulite Terrane, India

Mukhopadhyay, Sarmistha; Ray, Jyotisankar; Balaram, V.; Krishna, A. Keshav; Ghosh, Biswajit; Mukhopadhyay, Subrata

doi:10.1016/j.jseaes.2011.07.011

Cited by 10 publications

(11 citation statements)

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“…1). In case of carbonatite complexes, total ten exposures of Proterozoic age have been recognized in India (Fig 1) Ray et al, 2013), Purulia (>1300 Ma; Chakrabarty, 2009), Sevattur (801 Ma;Schleicher et al, 1997), Jokipatti and Samalpatti (770 Ma and 700 Ma; Moralev et al, 1975), Elagiri (757 Ma; Mukhopadhyay et al, 2011b), Pakkanadu-Mulakkadu (750 Ma;Möller et al, 2001), and Munnar (740 Ma;Odom, 1982). The Newania and Purulia carbonatite complexes are located in Rajasthan and West Bengal, respectively, whereas the rest of the complexes are located in Tamil Nadu (see Table 1 for details).…”

Section: Occurrences Geological Settings and Field Aspects Of Protementioning

confidence: 99%

Proterozoic Alkaline rocks and Carbonatites of Peninsular India: A review

2020

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African orogeny events. Whereas clinopyroxene, amphibole, titanite and apatite fractionation seems to have affected the nephelinite, nepheline syenite and syenite, carbonatite is affected by fractionation of calcite, dolomite, ankerite, pyroxene, apatite, magnetite, mica, and pyrochlore. Trace elements and Sr-Nd-Pb-C-O isotopic compositions of these ARCs strongly suggest a subcontinental lithospheric mantle source, that is enriched either by distribution of subducted crustal material or by metasomatism of mantle-derived fluids, for the generation of ARCs. Despite some isotopic variability that can result from crustal contamination, a trend showing enrichment in 87 Sr/ 86 Sr i (0.702 to 0.708) and depletion in ε Nd(i) (-1.3 to -14.1) over a 2 Gyr duration indicates temporal changes in the lithospheric/ asthenospheric source of ARCs, due to periodic enrichment of the source by mantle-derived fluids. ARC generation starts in an intracontinental rift setting (beginning of Wilson cycle). These early-formed ARCs are carriedto 100 km depths during continental collision (termination stage of Wilson cycle) and undergo extensive

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Section: Occurrences Geological Settings and Field Aspects Of Protementioning

confidence: 99%

Proterozoic Alkaline rocks and Carbonatites of Peninsular India: A review

2020

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“…In general, felsic rocks such as granites, granodiorites, and rhyolites contain ~0.01 to 0.5 wt % P2O5, mainly within apatite (Sha and Chappell, 1999;Belousova et al, 2001;Cao et al, 2012). Intermediate and mafic rocks have similar to slightly higher P2O5 contents, typically ranging from ~0.1 to 1 wt % (Belousova et al, 2001;Campos et al, 2002;Wang et al, 2003;Mukhopadhyay et al, 2011). Carbonatites are much more enriched in phosphorous and can contain up to 7.7 wt % P2O5 (Hogarth et al, 1985;Bühn et al, 2001).…”

Section: Introductionmentioning

confidence: 99%

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

et al. 2016

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“…Several Neoproterozoic intrusive alkaline complexes have been reported from the SGT distributed along the fault/shear zones (Bgure 1) (Miyazaki et al 2003;Upadhyay et al 2006;Mukhopadhyay et al 2011;Renjith et al 2016a and references therein). Only a few of these alkaline complexes have been dated: Upadhyay et al (2006) reported 590 ± 1.3 Ma U-Pb TIMS date of zircon from a pegmatite-syenite from Sivamalai alkaline complex, Dharapuram Shear Zone (DhSZ).…”

Section: Geological Frameworkmentioning

confidence: 99%

“…Detailed accounts of the Beld setting and mineralogy of many of the syenite plutons north of CSZ (except Sullya syenites) can be found in Upadhyay et al (2006), Mukhopadhyay et al (2011), Santosh et al (2014), and Renjith et al (2016a), and these are summarised in section 3.1. Detailed descriptions of the Beld relationships and petrography of the Sullya syenites, which are investigated in the present study, are given in section 3.…”

Section: Field and Petrographic Characteristics Of Shear Zone Alkalinmentioning

confidence: 99%

“…These alkaline igneous suites are most common in the northern part of the SGT. The geochemistry and geochronology of some alkaline suites occurring within, or proximal to, the Dharmapuri Shear Zone (DSZ), the Mercara Shear Zone (MSZ) and the Moyar Shear Zone (MoSZ) have been studied previously (Mukhopadhyay et al 2011;Santosh et al 2014;Renjith et al 2016a, b). However, little is known about the Beld and petrographic characters of the syenites of the MSZ and in this paper we will integrate new geochemical analyses with detailed Beld and petrographic data from a previously unstudied syenite along the MSZ.…”

Section: Introductionmentioning

confidence: 99%

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Field, petrographic and geochemical characteristics of Sullya alkaline complex in the Cauvery Shear Zone (CSZ), southern India: Implications for petrogenesis

et al. 2020

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Significant, but volumetrically smaller, unmetamorphosed and largely undeformed alkaline magmatic suites have been reported from the Southern Granulite Terrain in southern India. These Neoproterozoic alkaline magmatic rocks occur as lenses, dykes and plugs that are mostly within, or proximal to, major shear zones or transcrustal faults. In this contribution, Beld, petrographic and whole-rock geochemical data of Sullya syenites and associated maBc granulites from the Mercara Shear Zone (MSZ), which separates low-grade (greenschist to upper amphibolite facies) Dharwar Craton and high-grade (granulite facies) Southern Granulite Terrain is presented. The isolated body of the Sullya syenite, similar to other alkaline plutons of the Southern Granulite Terrain, shows an intrusive relationship with the host hornblende-biotite gneisses and maBc granulites. The Sullya syenites lack macroscopic foliations and unlike, other plutons, they are not associated with carbonatites and ultrapotassic granites. Potash feldspar and plagioclase dominates the felsic phases in the Sullya syenite and there is negligible quartz. The studied syenites show evidence of melt supported deformation, but show no evidence of recrystallization. Geochemically, they most resemble the Angadimogar syenites (situated 3 km west of the Sullya syenites) with similar major oxide and trace element concentrations. The petrogenetic studies of the Sullya syenite have indicated that they were generated by mixing of two different sources derived from the partial melting of metasomatized continental mantle lithosphere and lower crustal maBc granulites. This melt source could have been emplaced in a rift-related tectonic setting. The emplacement is considered to be controlled by shears.

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Geochemistry and petrogenesis of syenites and associated rocks of the Elagiri complex, Southern Granulite Terrane, India

Cited by 10 publications

References 89 publications

Proterozoic Alkaline rocks and Carbonatites of Peninsular India: A review

Proterozoic Alkaline rocks and Carbonatites of Peninsular India: A review

Apatite Trace Element Compositions: A Robust New Tool for Mineral Exploration

Field, petrographic and geochemical characteristics of Sullya alkaline complex in the Cauvery Shear Zone (CSZ), southern India: Implications for petrogenesis

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