Geological setup, structure and metamorphism of south-eastern part of Sandur Schist Belt around Obulapuram area, Anantapur District, Andhra Pradesh

Geological mapping of over 50 km 2 area has been carried out in and around Obulapuram area, SE of Sandur Schist Belt. The Sandur Schist Belt (SSB), a part of Eastern Dharwar Craton (EDC) is a NW–SE trending lens-shaped late Archaean volcano-sedimentary belt. The litho-types exposed include peninsula...

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Bibliographic Details
Published in:Arabian journal of geosciences 2024, Vol.17 (3), Article 95
Main Authors: Bhat, Nadeem Ahmad, Bhimte, Amit Devidas, Mishra, Snigdharani, Barik, Samir Kumar, Sahu, Siba Sundar, Mishra, Raghunath, Mohan, Reshma Venalkudy, Ghosh, Prasun
Format: Article
Language:English
Subjects:
Amphibolite facies
Amphibolites
Basalt
Belts
Cratons
Deformation
Earth and Environmental Science
Earth Sciences
Gabbro
Geologic mapping
Geological mapping
Gneiss
Granite
Haematite
Hematite
Magnetite
Metamorphism
Metamorphism (geology)
Quartzite
Regional development
Schist
Schists
Sedimentary facies
Short Communication
Volcanoes
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Summary:Geological mapping of over 50 km 2 area has been carried out in and around Obulapuram area, SE of Sandur Schist Belt. The Sandur Schist Belt (SSB), a part of Eastern Dharwar Craton (EDC) is a NW–SE trending lens-shaped late Archaean volcano-sedimentary belt. The litho-types exposed include peninsular gneiss of PGC, fuchsite quartzite, meta-basalt with intercalation of amphibolite, phyllite, metagabbro and quartzite, banded magnetite quartzite (BMQ), banded hematite quartzite (BHQ) belonging to the Donimalai Formation of Sandur Group. Granites, dolerite dykes, gabbro dykes and quartz veins are younger intrusives. Basement Peninsular Gneiss and intrusive granite are exposed towards the southern and eastern side of the study area. The area has undergone two phases of deformation, of which the earlier D 1 deformation is quite pronounced producing the NW–SE trending S 0 ∥S 1 regional structures of the area. D 1 deformation is responsible for the development of tight isoclinal and macroscopic (F 1 ) folds. D 2 deformation resulted in the development of open to close mesoscopic (F 2 ) folds and broad warps with axial traces along ENE-WSW direction and crenulation cleavage (S 2 ). The area is predominantly characterised by regional green schist facies of metamorphism, which increases to amphibolite facies near the contact of the schist belt with gneisses and intrusive granites.
ISSN:1866-7511
1866-7538
DOI:10.1007/s12517-024-11902-x