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Time Relationship Between Regional Deformation and Fabric Development in the Peralimala Pluton, South India - Inferences from Magnetic Fabric


Affiliations
1 Department of Geology, University of Kerala, Kariavattom, Trivandrum - 695 581, India
2 Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, India
     

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Anisotropy of magnetic susceptibility (AMS) is investigated in samples of Peralimala (PM) pluton (ca. 550 Ma) and adjacent gneiss, gabbro, mylonite and amphibolite from the Moyar Shear Zone (MSZ), Southern Granulite Terrane (SGT) with an aim to decipher the time-relationship between fabric development in the pluton and regional tectonics. Magnetic foliation recorded in the PM pluton is sub-parallel to the WNW-ESE striking MSZ. Magnetic foliation and lineation trajectories are sigmoidal and curve into the shear zone. A dextral sense of shear is deciphered from the trajectories, which is similar to that reported within the MSZ in some earlier studies. It is inferred that the PM pluton has developed post-emplacement deformation-fabric related to reactivation of the MSZ during Pan-African age. Based on the data and existing information about regional tectonics of the area, the possibility of the (a) PM pluton being a Deformed Alkali Rock and Carbonatite (DARC) and (b) MSZ marking an ancient suture zone, is discussed.

Keywords

Southern Granulite Terrane, Moyar Shear Zone, Deformed Pluton, Anisotropy of Magnetic Susceptibility, DARC.
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  • Time Relationship Between Regional Deformation and Fabric Development in the Peralimala Pluton, South India - Inferences from Magnetic Fabric

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Authors

K. R. Praveen
Department of Geology, University of Kerala, Kariavattom, Trivandrum - 695 581, India
V. Prasannakumar
Department of Geology, University of Kerala, Kariavattom, Trivandrum - 695 581, India
Manish A. Mamtani
Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur - 721 302, India

Abstract


Anisotropy of magnetic susceptibility (AMS) is investigated in samples of Peralimala (PM) pluton (ca. 550 Ma) and adjacent gneiss, gabbro, mylonite and amphibolite from the Moyar Shear Zone (MSZ), Southern Granulite Terrane (SGT) with an aim to decipher the time-relationship between fabric development in the pluton and regional tectonics. Magnetic foliation recorded in the PM pluton is sub-parallel to the WNW-ESE striking MSZ. Magnetic foliation and lineation trajectories are sigmoidal and curve into the shear zone. A dextral sense of shear is deciphered from the trajectories, which is similar to that reported within the MSZ in some earlier studies. It is inferred that the PM pluton has developed post-emplacement deformation-fabric related to reactivation of the MSZ during Pan-African age. Based on the data and existing information about regional tectonics of the area, the possibility of the (a) PM pluton being a Deformed Alkali Rock and Carbonatite (DARC) and (b) MSZ marking an ancient suture zone, is discussed.

Keywords


Southern Granulite Terrane, Moyar Shear Zone, Deformed Pluton, Anisotropy of Magnetic Susceptibility, DARC.

References