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Inferring a Neoproterozoic orogeny preceding the Rodinia break-up in the Sirohi Group, NW India

By
Devsamridhi Arora
Devsamridhi Arora
Department of Geology, University of Delhi, Delhi 110007, India
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Naresh C. Pant
Naresh C. Pant
Department of Geology, University of Delhi, Delhi 110007, India
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Fareeduddin
Fareeduddin
Bangalore Metro Rail Corporation Ltd, India
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Surbhi Sharma
Surbhi Sharma
Department of Geology, University of Delhi, Delhi 110007, India
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Raghuram
Raghuram
Geological Survey of India, Faridabad, Haryana 121001, India
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Mohd. Sadiq
Mohd. Sadiq
Geological Survey of India, Faridabad, Haryana 121001, India
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Published:
January 01, 2017

Abstract

Recent studies indicate the Delhi Orogeny to be a Grenvillian-age collision event in the NW Indian Shield. West of the southern part of the South Delhi Fold Belt, aeromagnetic anomalies show a high-angle relationship with the Delhi Fold Belt trend. We examined an argillaceous–calcareous metamorphosed sequence exposed within and adjacent to this aeromagnetic anomaly. This sequence, deposited over a granitic basement, is reported as the Sirohi Group. The basement granite is dated to be 892 ± 10 Ma (Erinpura age) and this was partially reset at 815 ± 43 Ma. The metapelites preserve a low- to medium-grade metamorphic assemblage (peak temperature of c. 460°C) and the metamorphism took place at 822 ± 29 Ma, which was partially reset at 723 ± 65 Ma. The partial resetting can be ascribed to the Malani eruption. Control of accessory minerals on the garnet trace element chemistry is evident in the Y distribution of the two analysed garnets.

It is contended that the Rodinia break-up, marked by Malani Igneous Suite, was preceded by an orogenic event (the Sirohi Orogeny) which marked the culminating mountain-building event in the cratonization of the NW Indian Shield.

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Contents

Geological Society, London, Special Publications

Crustal Evolution of India and Antarctica: The Supercontinent Connection

N. C. Pant
N. C. Pant
University of Delhi, India
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S. Dasgupta
S. Dasgupta
Jamia Millia Islamia, India
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The Geological Society of London
Volume
457
ISBN electronic:
9781786203380
Publication date:
January 01, 2017

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