Fold pattern analysis around Kanjamalai Salem district Tamilnadu
Open Access
- 30 October 2020
- journal article
- Published by IOR Press in International Journal of Civil, Environmental and Agricultural Engineering
- Vol. 2 (2), 74-32
- https://doi.org/10.34256/ijceae2025
Abstract
Kanjamalai one of the fascinating location in Southern Granulite Terrain (SGT) for studying Archaean geology and structures as the entire hill is made up of variety of rock types like two pyroxene granulite, amphibolites, quartzo - feldsapthic gneisses, banded iron formation, and intrusive rocks like dunite, peridotite and pegmatite and beautifully carved structures. The entire hill resembles a canoe shape with doubly plunging fold structure with E-W elongation. The entire hillock seems to sit pretty on mylonitised hornblende biotite gneisses which also have a common N70-95 degree trend and sub vertical dip with NE plunge which is in contradiction to centrally plunging lineations of the hill. The SW part of Kanjamalai near Chinasrirangapadi was displaying beautiful fold structures, with interference pattern out of which six domains were selected for detailed study and analysis. The multiple generation folded structure will have a clue in reconstructing the deformation history of this Kanjamalai. The observed f1, f2 and f3 folds show significant Type III interference pattern as that of Ramsay and 01 and 03 type folds of Bernhard Grasemann. Wavelength –amplitude analysis was made to generalize and regroup the observed folds in to high amplitude, high wavelength or open folds, low wavelength and Mesoscopic folds. And visual harmonic analysis was made to analyse the symmetry of the folds and analyze the geometry, symmetry and harmony and genesis of the fold in terms of relative timing of the events.Keywords
This publication has 13 references indexed in Scilit:
- Classification of Refold StructuresThe Journal of Geology, 2004
- The geometry and kinematics of flow perturbation foldsTectonophysics, 2002
- Modifications of early lineations during later folding in simple shearPublished by Geological Society of America ,2001
- The Nilgiri enderbites, South India: nature and age constraints on protolith formation, high-grade metamorphism and cooling historyPrecambrian Research, 1999
- Nature of the Moyar and Bhavani shear zones, with a note on its implication on the tectonics of the southern Indian Precambrian shieldJournal of Earth System Science, 1996
- Folds with axes parallel to the extension direction: an experimental studyJournal of Structural Geology, 1995
- Fold‐fault relationships in low‐angle detachment systemsTectonics, 1994
- Precambrian Tectonics and Crustal Evolution in South IndiaThe Journal of Geology, 1984
- Development of sheath folds in shear regimesJournal of Structural Geology, 1980
- Classification of fold interference patterns: a reexaminationJournal of Structural Geology, 1980