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Relict Neoarchean Silico-Carbonatite from Elagiri Alkaline Complex, Southern Granulite Terrane, India


Affiliations
1 Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India
2 School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China
3 State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China

Here, we report the occurrence of relict Neoarchean silico-carbonatites from the Elagiri complex (12°31¢N: 78°35¢E), Southern Granulite Terrane, Indian Shield, where they occur within leucosyenites as enclaves. Trace elements suggest that the silico-carbonatites and leucosyenite are related through melting–crystallization epi­sodes. U–Pb zircon ages from the silico-carbonatites yield two statistical peaks at ~2539 ± 9 Ma (~emplacement age) and ~2490 ± 15 Ma (~younger overprinting age). High Th/U ratios of zircon are consistent with magmatic crystallization. We suggest that silico-carbonatite gene­ration was favoured by proto-plate subduction during the Neoarchean in this terrane.

Keywords

Leucosyenite, magmatic crystallization, mantle melting, proto-plate subduction, relict silico-carbonatite.
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  • Relict Neoarchean Silico-Carbonatite from Elagiri Alkaline Complex, Southern Granulite Terrane, India

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Authors

Jyotisankar Ray
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India
Qiong-Yan Yang
School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China
Liangshu Shu
State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjing 210093, China
M. Santosh
School of Earth Sciences and Resources, China University of Geosciences Beijing, 29 Xueyuan Road, Beijing 100083, China
Anindita Dey
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India
Biswajit Ghosh
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India
Payel Dey
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India
Sohini Ganguly
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India
Sarmistha Mukhopadhyay
Department of Geology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, India

Abstract


Here, we report the occurrence of relict Neoarchean silico-carbonatites from the Elagiri complex (12°31¢N: 78°35¢E), Southern Granulite Terrane, Indian Shield, where they occur within leucosyenites as enclaves. Trace elements suggest that the silico-carbonatites and leucosyenite are related through melting–crystallization epi­sodes. U–Pb zircon ages from the silico-carbonatites yield two statistical peaks at ~2539 ± 9 Ma (~emplacement age) and ~2490 ± 15 Ma (~younger overprinting age). High Th/U ratios of zircon are consistent with magmatic crystallization. We suggest that silico-carbonatite gene­ration was favoured by proto-plate subduction during the Neoarchean in this terrane.

Keywords


Leucosyenite, magmatic crystallization, mantle melting, proto-plate subduction, relict silico-carbonatite.



DOI: https://doi.org/10.18520/cs%2Fv127%2Fi5%2F617-624