Journal ArticleDOI
Crustal Evolution in South India: Constraints from Nd Isotopes
TLDR
In this paper, a range of lithologies, including charnockites, metasediments, and granitoids that comprise the high-grade terrain of South India define contrasting age provinces.Abstract:
Nd-isotope analyses from a range of lithologies, including charnockites, metasediments, and granitoids that comprise the high-grade terrain of South India define contrasting age provinces. North of the Palghat-Cauvery shear zone, the Karnataka Craton and the granulite blocks of Nilgiri and Madras are characterized by model Nd ages from 3.4 to 2.4 Ga with significant crustal growth during the Late Archean. South of the Palghat-Cauvery shear zone a Pan-African granulite-facies event resulted in Sm/Nd fractionation, as observed in several incipient charnockite localities. Model Nd age calculations that allow for Sm/Nd fractionation at 550 Ma yield ages in the range of 2.9 to 1.3 Ga. This range compares closely with published model Nd ages from the high-grade terrain of Sri Lanka. Mid-Proterozoic crustal growth (~1.1 Ga) observed in the Vijayan Complex of Sri Lanka may have provided source material for metasediments characterized by young model Nd ages in southern Peninsular India. The Palghat-Cauvery shear z...read more
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A synopsis of events related to the assembly of eastern Gondwana
TL;DR: The assembly of the eastern part of Gondwana (eastern Africa, Arabian-Nubian shield (ANS), Seychelles, India, Madagascar, Sri Lanka, East Antarctica and Australia) resulted from a complex series of orogenic events spanning the interval from ∼750 to ∼530 Ma as mentioned in this paper.
Journal ArticleDOI
Amalgamating eastern Gondwana: The evolution of the Circum-Indian Orogens
TL;DR: In this paper, the authors integrated Neoproterozoic palaeomagnetic solutions from the various blocks that made up eastern Gondwana, with the large amount of recent geological data available from the orogenic belts that formed as eastern gondwana amalgamated.
Journal ArticleDOI
Anatomy of a Cambrian suture in Gondwana: Pacific-type orogeny in southern India?
TL;DR: In this paper, a model involving Pacific-type orogeny was proposed to explain the Neoproterozoic evolution of southern India and its final amalgamation within the Gondwana assembly.
Journal ArticleDOI
The thermal history of the Eastern Ghats Belt (India) as revealed by U–Pb and 40Ar/39Ar dating of metamorphic and magmatic minerals: implications for the SWEAT correlation
Klaus Mezger,Michael A. Cosca +1 more
TL;DR: The Eastern Ghats belt is a large high-grade terrane exposed along the east coast of India as mentioned in this paper, which represents an important part of the reconstructed global Southwest-United States-East-Antarctica (SWEAT) orogen.
Journal ArticleDOI
Precambrian crustal evolution of Peninsular India: A 3.0 billion year odyssey
Joseph G. Meert,Manoj K. Pandit,Vimal R. Pradhan,Jonathan Banks,Robert Sirianni,Misty M. Stroud,Brittany Newstead,Jennifer N. Gifford +7 more
TL;DR: In this paper, the authors review the major tectonic and igneous events that led to the formation of Peninsular India and provide an up-to-date geochronologic summary of the Precambrian.
References
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Journal ArticleDOI
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Journal ArticleDOI
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