Record of Post-Collisional A-Type Magmatism in the Alwar Complex, Northern Aravalli Orogen, NW India

Kaur, Parampreet; Eliyas, Nusrat; Chaudhri, Naveen

doi:10.18520/cs/v112/i03/608-615

Cited by 9 publications

(1 citation statement)

References 37 publications

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“…They are stratigraphically classified into an older Raialo Group (predominantly carbonates), which is succeeded by the Alwar Group (predominantly arenaceous: quartzite) and the Ajabgarh Group (predominantly argillaceous: metapelite). The 1.73–1.70 Ga A‐type granites of the Khetri and Alwar complexes, along with 1.85 Ga continental arc granitoids of the Khetri complex (Biju‐Sekhar et al, ; Kaur, Zeh, & Chaudhri, ; Kaur, Zeh, Chaudhri, & Eliyas, ), form the basement for the metasedimentary rocks of the Delhi Supergroup (Biju‐Sekhar et al, ; Kaur, Eliyas, & Chaudhri, ; Kaur, Zeh, Chaudhri, Gerdes, & Okrusch, ). These rocks generally show evidence of medium‐grade metamorphic overprint with P–T conditions in the range of 500–600°C at 300–500 MPa (e.g., Gangopadhyay & Sen, ; Kaur et al, ; Lal & Ackermand, ; Sarkar & Dasgupta, ).…”

Section: Geological Settingmentioning

confidence: 99%

Chlorine‐rich amphibole and biotite in the A‐type granites, Rajasthan, NW India: Potential indicators of subsolidus fluid–rock interaction and metallogeny

2018

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The A-type granites in the northern Delhi fold belt, Rajasthan, India, comprise Clenriched amphibole and biotite. These hydrous phases, in general, show significant variation in the Cl and F contents on the scale of individual intrusions and also at times on thin-section scale. This variation of the hydrous phases that equilibrated with the fluid is principally controlled by the variation in the fluid activity ratios of a Cl -/a OHand a F -/a OH -. The activity gradients in the fluid developed due to the interaction between the granites and an externally derived Cl-bearing fluid coupled with limited integrated fluid flux. The fraction of the fluid that reached the least albitised granite was highly Cl-rich as a consequence of preferential extraction of water from the grain-boundary fluid for the formation of hydrous phases like epidote and sericite. The occurrence of Cl-rich amphibole and biotite coupled with the variation in their halogen contents in the A-type granites can act as potential indicators of hydrothermal fluid activity and the subsequent mineralisation in a region.

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Section: Geological Settingmentioning

confidence: 99%

Chlorine‐rich amphibole and biotite in the A‐type granites, Rajasthan, NW India: Potential indicators of subsolidus fluid–rock interaction and metallogeny

2018

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Geochemistry of Late Palaeoproterozoic (1.69 Ga) A‐type Mayong granitoids in Shillong Plateau, north‐east India: Implication for anorogenic magmatism during Columbia Supercontinent cycle

et al. 2021

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The Late Palaeoproterozoic Mayong granitoids of Assam constitute an important component of the continental crust and the Basement Gneissic Complex in the northern extension of the Shillong Plateau, north‐east India. The basement rocks of Shillong Plateau are considered as a continuation of the Central Indian Tectonic Zone. In this study, emphasis is given on the new zircon U–Pb age, Hf isotopic composition, and the tectonic implication of Late Palaeoproterozoic Mayong granitoids. The Mayong granitoids are essentially composed of quartz—K‐feldspar—plagioclase—biotite—hornblende as major minerals and titanite—zircon—allanite—bastnaesite—apatite—ilmenite as the accessory mineral phase. They show typical geochemical characteristics of A‐type granites, such as high silica (average 71.86 wt%), alkalies (average 8.01 wt%), Rb, Zr, Nb, Ga, and rare earth elements (except Eu); high FeOt/MgO and Ga/Al ratios, and low CaO, MgO, Ba, Sr, P, Eu, and Ti concentrations. Laser ablation inductively coupled plasma mass spectrometry zircon U–Pb dating indicates that they were emplaced at ~1,687 ± 35 Ma during the large‐scale magmatism of Late Palaeoproterozoic to Early Mesoproterozoic periods. Their zircon Hf model (TDM2) ages (1,833–2,257 Ma) in conjunction with trace elemental characteristics suggest that they were generated by the reworking/recycling of Early Palaeoproterozoic crust in an intraplate extensional tectonic environment. Thus, we conclude that these A‐type Late Palaeoproterozoic Mayong granitoids of the Shillong Plateau probably have a close genetic linkage with the magmatic event of the Columbia Supercontinent cycle during 1,687 ± 35 Ma.

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Geochemistry and petrogenesis of the Paleoproterozoic ortho-gneisses and granitoids of the Banded Gneissic Complex, central Rajasthan, NW India: Implications for crustal reworking processes

Ahmad

Latheef²,

Mondal³

et al. 2022

Acta Geochim

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Record of Post-Collisional A-Type Magmatism in the Alwar Complex, Northern Aravalli Orogen, NW India

Cited by 9 publications

References 37 publications

Chlorine‐rich amphibole and biotite in the A‐type granites, Rajasthan, NW India: Potential indicators of subsolidus fluid–rock interaction and metallogeny

Chlorine‐rich amphibole and biotite in the A‐type granites, Rajasthan, NW India: Potential indicators of subsolidus fluid–rock interaction and metallogeny

Geochemistry of Late Palaeoproterozoic (1.69 Ga) A‐type Mayong granitoids in Shillong Plateau, north‐east India: Implication for anorogenic magmatism during Columbia Supercontinent cycle

Geochemistry and petrogenesis of the Paleoproterozoic ortho-gneisses and granitoids of the Banded Gneissic Complex, central Rajasthan, NW India: Implications for crustal reworking processes

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