Petrogenesis of shoshonitic granitoids, eastern India: Implications for the late Grenvillian post-collisional magmatism

Goswami, Bangshidhar; Bhattacharyya, C.

doi:10.1016/j.gsf.2013.09.003

Cited by 44 publications

(31 citation statements)

References 81 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Metaluminous, high-K to shoshonitic calc-alkaline rocks with very similar geochemical characteristics to those of the present study have been reported in several regions, for example, in southwestern Africa, Cameroon (BanefoMvoutsaha Massif, Nono et al 2010) as well as eastern India (Mesoproterozoic PGG granitoids, Gonswami & Bhattacharyya 2014). On the basis of their geochemical signatures presented, these rocks were related to late-to post-orogenic settings, with geochemical features associated with subduction zones.…”

Section: Discussionsupporting

confidence: 88%

Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil

et al. 2016

View full text Add to dashboard Cite

ABSTRACT:The Serra da Aldeia Suite is composed by circular or oval-shaped plutons, intrusive in meta-sedimentary and meta-volcanosedimentary rocks in the Riacho do Pontal Fold Belt, NE Brazil. The Serra das Melancias Pluton, belonging to Serra da Aldeia Suite, is located southeastern of Piaui state, near Paulistana city. These plutons represent a major magmatic expression in this area and contain important information about the late magmatic/collisional geologic evolution of the Brasiliano Orogeny. Based on petrographic and geochemical data, three facies were defined in the Serra das Melancias Pluton: granites, syenites and quartz monzonites. The rocks display high-K and alkaline to shoshonitic affinities, are metaluminous and show ferrous character. They are enriched in Light Rare Earth Elements and Large Ion Lithophile Elements, with negative anomalies in Nb, Ta and Ti. Their high Ba, Sr, K/Rb, low Rb, relatively low U, Th, Nb to very low Heavy Rare Earth Elements and Y resemble those of typical high Ba-Sr granitoids. The geochemical data suggest the emplacement of Serra das Melancias Pluton in a transitional, late to post-orogenic setting in the Riacho do Pontal Fold Belt during the late Brasiliano-Pan African Orogeny.KEYWORDS: alkaline granites; geochemistry; Riacho do Pontal Fold Belt; Borborema Province; high Ba-Sr granites. RESUMO: A suíte Serra da Aldeia é composta por plútons graníti-cos circulares ou ovalados, intrusivos em sequências metassedimentares e metavulcanossedimentares na Faixa Riacho do

show abstract

Section: Discussionsupporting

confidence: 88%

Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil

et al. 2016

View full text Add to dashboard Cite

show abstract

“…The long axis of the Raghunathpur pluton is ENE-WSW. The porphyritic granitoids contain strongly aligned euhedral crystals of pinkish Kfeldspar megacrysts (figure 2F) which is interpreted to be due to magmatic flow (Goswami and Bhattacharyya 2014). The long dimension of feldspar grains ranges from 3 to 10 cm.…”

Section: Geologic Settingmentioning

confidence: 99%

“…The border zones of all these granitoid bodies show the development of augen gneisses and mylonites. A detailed study on the origin of the fabric of porphyritic granitoid batholith of Raghunathpur had been published earlier by Goswami and Bhattacharyya (2014).…”

Section: Nature Of Fabric In Granitoid Plutonsmentioning

confidence: 99%

See 2 more Smart Citations

Physico-chemical conditions of four calc-alkaline granitoid plutons of Chhotanagpur Gneissic Complex, eastern India: Tectonic implications

et al. 2018

View full text Add to dashboard Cite

Chhotanagpur Gneissic Complex, eastern India, are investigated. The plutons, as a whole, are composed of varying proportions of Qtz-Pl-Kfs-Bt-Hbl±Px-Ttn-Mag-Ap-Zrn±Ep. The composition of biotite is consistent with those of calc-alkaline granitoids. Hornblende-plagioclase thermometry, aluminium-in-hornblende barometry and the assemblage sphene-magnetite-quartz were used to determine the P , T and f O2 during the crystallisation of the parent magmas in different plutons. The plutons are crystallised under varying pressures (6.2-2.4 kbar) and a wide range of temperatures (896-718 • C) from highly oxidised magmas (log f O2 −11.2 to −15.4 bar). The water content of the magma of different plutons varied from 5.0 to 6.5 wt%, consistent with the calc-alkaline nature of the magma. Calc-alkaline nature, high oxygen fugacity and high H 2 O melt suggest that these plutons were emplaced in subduction zone environment. The depths of emplacement of these plutons seem to increase from west to east. Petrologic compositions of these granitoids continuously change from enderbite (opx-tonalite: Sarpahari) in the east to monzogranite (Raghunathpur) to syenogranite (Sindurpur) to alkali feldspar granite (Agarpur) in the west. The water contents of the parental magmas of different plutons also increase systematically from east to west. No substantial increase in the depth of emplacement is found in these plutons lying south and north of the major shear zone passing through the study area suggesting the strike-slip nature of the east-west shear zone.

show abstract

Neoproterozoic granitic activity in syn‐collisional setting: Insight from petrology, geochemistry, and zircon–monazite geochronology of S‐type granites of the Chotanagpur Granite Gneissic Complex, eastern India

et al. 2019

View full text Add to dashboard Cite

The evidence of a long‐lived Grenvillian orogeny around 1.0 Ga is preserved in the eastern part of India in the form of large‐scale syn‐collisional granitic activity and high‐grade metamorphism in the Chotanagpur Granite Gneissic Complex (CGGC). Geochemically, granitoid rocks of CGGC were classified as ferroan, per‐aluminous, and calc‐alkalic to alkali‐calcic S‐type granites which were generated from the anatexis of meta‐sedimentary protolith (khondalite) in a volcanic‐arc to syn‐collisional setting. Relatively high crystallization temperatures (800–850°C for garnetiferous granite gneiss, 770–830°C for megacrystic granite gneiss, and 639–725°C for pink granite) of these rocks were calculated by geothermometric calculations. The REE modelling testified that 40–45% partial melting of the khondalite in H2O undersaturated condition at around 5‐kbar pressure might have given rise to the parent magma of the garnetiferous granite gneiss (GGG). LA‐ICPMS zircon (U–Pb) dating yielded the crystallization ages of the megacrystic granite gneiss (MGG) and pink granite (PG) as ~1.0 Ga, and EPMA monazite (U–Th–total Pb) dating suggested that the GGG was metamorphosed during 1.0 Ga. The 1.0–0.90 Ga age of high‐grade metamorphism and anatexis in the CGGC may be correlated with that in the Rayner Complex–Eastern Ghats Belt in the Indo‐Antarctic sector, which is considered as the result of Indo‐Antarctic collision during the assembly of Rodinia.

show abstract

Petrogenesis of shoshonitic granitoids, eastern India: Implications for the late Grenvillian post-collisional magmatism

Cited by 44 publications

References 81 publications

Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil

Geochemistry of the Serra das Melancias Pluton in the Serra da Aldeia Suite: a classic post-collisional high Ba-Sr granite in The Riacho do Pontal Fold Belt, NE Brazil

Physico-chemical conditions of four calc-alkaline granitoid plutons of Chhotanagpur Gneissic Complex, eastern India: Tectonic implications

Neoproterozoic granitic activity in syn‐collisional setting: Insight from petrology, geochemistry, and zircon–monazite geochronology of S‐type granites of the Chotanagpur Granite Gneissic Complex, eastern India

Contact Info

Product

Resources

About