NDLI: The Eastern Ghats Belt … A polycyclic granulite terrain

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The Eastern Ghats Belt … A polycyclic granulite terrain

Content Provider	Springer Nature Link
Author	Mukhopadhyay, Dhruba Basak, Krishnapriya
Copyright Year	2009
Abstract	The Eastern Ghats Belt is a polycyclic granulite terrain along the east coast of India whose western boundary is marked by a shear zone along which the granulites are thrusted over the cratonic units of the Indian shield, and its northern margin is marked by the presence of a number of fault-bounded blocks. Recent work has convincingly brought out that there are domains within the belt having different evolutionary histories. The segment south of the Godavari Rift went through a high grade thermo-tectonic event at ∼1.6–1.7 Ga. North of the Godavari Rift in a narrow zone along the western boundary the last high-grade metamorphic event is of late Archaean age. A series of alkaline plutons along the western boundary zone testifies to a rifting episode at ∼1.3–1.5 Ga. In the major part of the EGB the metamorphism is broadly of Grenvillian age, with two major thermo-tectonic pulses at ∼1.1–1.2 Ga and ∼0.95–1.0 Ga. But high grade conditions persisted for a long period and younger thermal events of ∼0.65 Ga to ∼0.80 Ga are locally recorded. There are differences in the tectonometamorphic histories of different domains, but the tectonic significance of these differences remains uncertain. Pan-African (0.50–0.55) thermal overprints are common and become conspicuous along the western boundary zone. The thrusting of the Eastern Ghats granulites in a hot state over the cratons to the west is of Pan-African age. In the Rodinia assembly (∼0.9 Ga) the Eastern Ghats and the Rayner-Napier Complexes of Antarctica were contiguous, but the pre-Rodinia configuration of these terrains remains unclear. At ∼0.8 Ga during the Rodinia break up Greater India rifted apart from East Antarctica, and only later it docked with Australia-East Antarctica at 530–550 Ma. The continuation of the East Antarctic Pan-African orogenic belts into the Eastern Ghats is yet to be ascertained.
Starting Page	489
Ending Page	518
Page Count	30
File Format	PDF
ISSN	00167622
Journal	Journal of the Geological Society of India
Volume Number	73
Issue Number	4
e-ISSN	09746889
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-05-20
Publisher Place	India
Access Restriction	Subscribed
Subject Keyword	Granulite terrain Rodinia assembly Pan-African events Eastern Ghats Hydrogeology Geology
Content Type	Text
Resource Type	Article
Subject	Geology

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