Abstract
This study aims to investigate the petrography and strain pattern of mylonites from parts of N-S trending Sitampundi-Kanjamalai Shear Zone (SKSZ) around Thiruchengode. The petrographic study indicates the presence of recrystallized quartz, K-feldspar, plagioclase, biotite and some hornblende. The kinematic analysis of Mylonites was done with the help of shear sense indicators such as recrystallized type quartz (quartz ribbon) around the cluster of feldspar, S-C fabric shows dextral shear sense and some sinisterly shear sense in some parts of SASZ which can be considered as a product of partitioning of both strain and vorticity between domains. These all indicates the simple shear extension along E-W direction and the mylonitic foliation shows the pure shear compression along N-S direction. Further the study of bulk strain analysis by Flinn plot method using L and T section of mylonite shows k<1 which lies in the field of flattening zone of finite strain. The kinematic vorticity number is calculated by Rxz/β method which gives the value of 0.36 indicating the general shear. The rigid grain graph shows that the pure shear component is more dominant than the simple shear component. The analysis leads to the conclusion that the mylonite has experienced a high temperature shearing of above 700°cat deep crustal level.
Highlights
The process of Mylonitic rocks are foliated high-strain rocks mylonitization is usually associated with addition of aqueous formed in ductile shear zones under low to medium-grade fluid to the deforming rock system
Mylonites are subdivided into three study area covers survey of India (SOI) topographic sheets categories by their matrix-to-porphyroclast ratio [1, 2]. 58 I/3, 58 I/4 58 E/15 and 58 E/16
Quartz is the dominant phase with little bit of Morepalayam hill shows the development of mylonites feldspar and microcline in the rock, biotite shows within the parent rock mafic granulite, migmatites and straight extinction and it has been recrystallized around quartz-feldspathic gneisses
Summary
Strain Pattern Analysis of Mylonites From Sitampundi-Kanjamalai Shear Zone, Thiruchengode, South India.
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