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• W4385777614 endingPage "105823" @default.
• W4385777614 startingPage "105823" @default.
• W4385777614 abstract "The Southern Granulite Terrane (SGT), at the southern tip of the Indian shield, is an integral component in the Proterozoic orogens of India. It is a collage of several crustal blocks amalgamated through several tectonic processes. These blocks are demarcated by several shear zones that can be traced across different Gondwana fragments. Characterizing the tectonics and anatomy of shear zones is essential to understand the controlling factors for mineral deposition, igneous activity, migmatisation, and crustal deformation. In the present study, we utilized terrestrial and satellite-derived gravity data, EMAG2v3 global Earth Aeromagnetic data, and computed gravity gradient to understand structural heterogeneities within geological formations. The Bouguer anomaly and gravity gradients in the region highlight spatial variability of the terrane at different depth scales, and unambiguously decipher the Mayur-Bhavani-Cauvery Shear System (MBCS) and its continuity to a lower crustal depth of 30-40 km, similar to other shear zones. In contrast, signatures of the Achan-Kovil shear zone (AKSZ) and other minor shear zones disappear at shallow depths whereas the Palghat gap, Nilgiris hills, and Coorg block extend up to deeper levels. The derived reduced-to-pole map, however, reveals an extended wide negative magnetic anomaly, which clearly marks the band of low-amplitude anomalies separating SGT from the northern Dharwar craton. The 2-D joint modelling across the NNW-SSE traverses across the SGT covering the major Shear zones (AKSZ, PCSZ, and MBSZ) and EDC, revealing a four-layer crustal configuration constrained by seismic results. The Moho ranges from 36 km to 45 km along the profile, and beneath the Palghat gap. The Moho is upwarping (∼5 km) showing positive gravity anomaly caused by high density material (2.80 gm/cc) at intermediate crustal levels. The combined analysis of qualitative interpretation of gravity and magnetic anomalies and joint modelling results clearly distinguishes between different crustal block and their bounding shear zones in accordance with the available tectonic framework." @default.
• W4385777614 created "2023-08-13" @default.
• W4385777614 creator A5002722090 @default.
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• W4385777614 date "2023-10-01" @default.
• W4385777614 modified "2023-10-14" @default.
• W4385777614 title "Tectonic and structural elements of Southern Granulite Terrane, South India: Inferences from gravity and magnetic studies" @default.
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• W4385777614 doi "https://doi.org/10.1016/j.jseaes.2023.105823" @default.
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