The physico-chemical conditions of crystallization of the Grenvillian arfvedsonite granite of Dimra Pahar, Hazaribagh, India: constraints on possible source regions

Basak, Ankita; Goswami, Bangshidhar

doi:10.1007/s00710-020-00708-w

Cited by 9 publications

(3 citation statements)

References 75 publications

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“…Several E-W trending plutons of porphyritic granitoids syn-kinematically intrude along the NPSZ, while the shear zone accommodated the pathways for the fast upward movement of the magma (Basak et al, 2019;Das et al, 2020). Moreover, peralkaline granites, nepheline syenite and carbonatite were emplaced along the NPSZ (Goswami and Bhattacharyya, 2010;Basak and Goswami, 2020).…”

Section: General Background Of the Chhotanagpur Gneissic Complexmentioning

confidence: 99%

Discovery of Early Tonian Calc‐alkaline and Shoshonitic Metamafic Rocks from the North Purulia Shear Zone, Chhotanagpur Gneissic Complex, Eastern India: Implications of Proterozoic Sub‐continental Lithospheric Mantle

Goswami

Das

Basak

et al. 2023

Acta Geologica Sinica (Eng)

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Reports of shoshonitic rocks in Precambrian terrains are relatively rare. Pl-Grt amphibolites and Hbl-Bt mafic granulites occurring in the migmatitic gneisses of the Chhotanagpur Gneissic Complex (CGC) show calc-alkaline and shoshonitic characteristics. Relict porphyritic, sub-ophitic and poikilitic textures are noted in these rocks. Their parent magma was emplaced during the waning phase of the regional metamorphism. Geochemically, these metamafics are similar to the Group III potassic and ultrapotassic rocks of Foley et al. (1987). The magma was derived from the metasomatized subcontinental lithospheric mantle (SCLM). Subduction-related sediment melts metasomatized the SCLM. Compositionally, the SCLM is a metasomatized phlogopite-amphibole-spinel-bearing harzburgite. 1%-5% batch melting of the SCLM could produce the parental magma of the mafic granulites. Pressures and temperatures of metamorphic equilibration were carried out by pseudosection modeling. Peak metamorphic assemblage (M 1 : Grt-Cpx-Pl-Qz) in garnetiferous amphibolite equilibrated at 740º C and 8.7 kbar. The Cpx-Pl corona appeared around the garnet during decompression (M 2 : 655°C, 6 kbar). The Hbl-Pl symplectites around garnet formed during isobaric cooling (M 3 : 580°C and 5.9 kbar). The emplacement of shoshonitic magma and subsequent decompression happened at the slab break-off stage of continental collision (~990 Ma).

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Section: General Background Of the Chhotanagpur Gneissic Complexmentioning

confidence: 99%

Discovery of Early Tonian Calc‐alkaline and Shoshonitic Metamafic Rocks from the North Purulia Shear Zone, Chhotanagpur Gneissic Complex, Eastern India: Implications of Proterozoic Sub‐continental Lithospheric Mantle

Goswami

Das

Basak

et al. 2023

Acta Geologica Sinica (Eng)

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“…The mineral assemblages and the physico-chemical properties of the magma are closely related during the crystallization process [39]. Temperature (T), pressure (P), and oxygen fugacity (f O 2 ) all have a significant impact on the mineral compositions and crystallization histories of magmatic systems.…”

Section: Conditions Of Magmatic Crystallizationmentioning

confidence: 99%

Integration of Whole-Rock Geochemistry and Mineral Chemistry Data for the Petrogenesis of A-Type Ring Complex from Gebel El Bakriyah Area, Egypt

Abd El-Fatah,

Surour,

Azer

et al. 2023

Minerals

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El Bakriyah Ring Complex (BRC) is a prominent Neoproterozoic post-collisional granite suite in the southern part of the Central Eastern Desert of Egypt. The BRC bears critical materials (F, B, Nb, and Ta) in appreciable amounts either in the form of rare-metals dissemination or in the form of fluorite and barite vein mineralization. The complex consists of inner syenogranite and outer alkali feldspar granite that have been emplaced in a Pan-African assemblage made up of granitic country rocks (granodiorite and monzogranite), in addition to post-collisional fresh gabbro as a part of the Arabian-Nubian Shield (ANS) in northeast Africa. Granites of the BRC are characterized by enrichment in silica, alkalis, Rb, Y, Ga, Nb, Ta, Th, and U and depletion in Sr, Ba, and Ti. Geochemical characterization of the BRC indicates that the magma is a crustal melt, which originated from the partial melting of metasedimentary sources. Concentrations of rare-earth elements (REEs) differ in magnitude from the ring complex and its granitic country rocks but they have similar patterns, which are sub-parallel and show LREEs enrichment compared to HREEs. The presence of a negative Eu anomaly in these rocks is related to plagioclase fractionation. The abundance of fluorine (F) in the different granite varieties plays an important role in the existence of a tetrad influence on the behavior of REEs (TE1, 3 = up to 1.15). Geochemical parameters suggest the crystallization of the BRC granite varieties by fractional crystallization and limited assimilation. Mn-columbite and Mn-tantalite are the most abundant rare-metals dissemination in the BRC granite varieties. We present combined field, mineralogical and geochemical data that are in favor of magma originating from a metasedimentary source for the BRC with typical characteristics of A-type granites. Our geodynamic model suggests that the Gebel El Bakriyah area witnessed the Neoproterozoic post-collisional stage of the ANS during its late phase of formation. This stage was characterized by the emplacement of fresh gabbros followed by the syenogranite and alkali-feldspar granite of the BRC into an arc-related assemblage (granodiorite and monzogranite). It is believed that the mantle-derived magma was interplated and then moved upward in the extensional environment to a shallower level in the crust owing to events of lithospheric delamination. This presumably accelerated the processes of partial melting and differentiation of the metasedimentary dominated source (Tonian-Cryogenian) to produce the A-type granites building up the BRC (Ediacaran).

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“…1,450 Ma) are well-documented in CGC from the terrane's central, northern, and north-eastern parts (Mukherjee et al, 2018;Sequeira et al, 2022). Furthermore, the 1.5 Ga event marked by gabbroic anorthosite massifs and felsic intrusions with occasional peralkaline rocks is also well known in CGC (Basak & Goswami, 2020;Chatterjee et al, 2008;Chatterjee & Ghose, 2011). So far, the previous studies in MGB do not provide detailed geochemical and geochronological data on any of the rocks present.…”

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confidence: 99%

Geochronological and geochemical constraints on the petrogenesis of alkali granites from the Makrohar Granulite Belt: Evidence for Mesoproterozoic extensional regime in the eastern Central Indian Shield

et al. 2022

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The Chotanagpur Gneissic Complex (CGC) is characterized by the Makrohar Granulite Belt (MGB) at its north-western margin parallel to Son-Narmada lineaments. The MGB exhibits a typical association of mantle-derived mafic tholeiitic and alkaline rocks along with the felsic units. The zircon U-Pb data on the intrusive granite gneiss from this association define a crystallization age of 1,498 ± 38 Ma, representing a widespread Mesoproterozoic within-plate magmatic event in CGC synchronous with the breakup of the Columbia Supercontinent. These granite gneisses have an alkaline affinity and are metaluminous in character. They exhibit many of the geochemical characteristics of anorogenic (A-type) magmas, including enrichment of incompatible trace elements, like Zr, Hf, Nb, Y, Ga, and rare earth elements (REE), but low in Ba and Sr as well as high FeO t /(FeO t + MgO) ($0.98) values and Ga/Al ($3.92) ratios.They show less fractionated REE patterns, characterized by relatively enriched LREE and flat HREE with negative Eu anomaly, and have high Zr-saturation temperatures ($955 C). Considering their field characteristics and all the geochemical and isotopic features, we conclude that they were derived from melting the lower crust metasomatized by mantle-derived alkali-rich fluids due to asthenospheric upwelling.

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The physico-chemical conditions of crystallization of the Grenvillian arfvedsonite granite of Dimra Pahar, Hazaribagh, India: constraints on possible source regions

Cited by 9 publications

References 75 publications

Discovery of Early Tonian Calc‐alkaline and Shoshonitic Metamafic Rocks from the North Purulia Shear Zone, Chhotanagpur Gneissic Complex, Eastern India: Implications of Proterozoic Sub‐continental Lithospheric Mantle

Discovery of Early Tonian Calc‐alkaline and Shoshonitic Metamafic Rocks from the North Purulia Shear Zone, Chhotanagpur Gneissic Complex, Eastern India: Implications of Proterozoic Sub‐continental Lithospheric Mantle

Integration of Whole-Rock Geochemistry and Mineral Chemistry Data for the Petrogenesis of A-Type Ring Complex from Gebel El Bakriyah Area, Egypt

Geochronological and geochemical constraints on the petrogenesis of alkali granites from the Makrohar Granulite Belt: Evidence for Mesoproterozoic extensional regime in the eastern Central Indian Shield

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