IDR - IIT Kharagpur

Fabric Development in the Malanjkhand Granite (Central India) and Its Relationship with Regional Tectonics

Fabric Development in the Malanjkhand Granite (Central India) and Its Relationship with Regional Tectonics

 

Several Tectonic And Geodynamic Processes Take Place During Accretion Of Continental Blocks. The Emplacement Of Granites Is One Such Process That Is Known To Be Associated With Continental Collision And Supercontinent Formation. Recent Researches On Granite Emplacement Processes Reveal That They Are Dominantly Synchronous With Regional Tectonics. Thus, Fabric Analysis In Granitic Rocks Can Provide Useful Information About Regional Tectonics. However, Analyzing Fabrics In Granites Is Challenging Because They Do Not Develop Mesoscopic Scale Fabrics At All Localities. The Malanjkhand Granite In Central India Is One Such Granite. It Is ∼2.48 Ga In Age And Lies To The South Of The Central Indian Suture (CIS) That Forms The Southern Extremity Of The Central Indian Tectonic Zone (CITZ). The Latter Is A Zone That Formed Due To Accretion Of The Northern And Southern Indian Shields During The Proterozoic Time. The Fabric In The Malanjkhand Granite And Its Relationship With Regional Tectonic Events Such As Evolution Of The CITZ And Formation Of CIS Has Not Been Investigated Earlier. The Objective Of This Research Is To Evaluate The Above. To Fulfill This Objective The Author Has Adopted An Integrated Approach Involving Field, Microstructure And AMS Studies. Data Related To Mesoscopic Fabric Are Presented. These Are Interpreted Along With Microstructures To Comment On The Time Relation Between Crystallization And Deformation Of Minerals During Different Temperatures. The Internal Fabric In The Granite Is Evaluated Using AMS Data And It Is Concluded That The Same Was Influenced By Tectonic Events That Led To Formation Of CIS. This Inference Is Also Supported By Fractal Analysis Of Quartz Grain Boundary Sutures And Measurement Of Strength Of Mineral Lineation In The Granite. It Is Concluded That The Suturing Of The Northern And Southern Indian Shields Took Place During The Palaeoproterozoic Time. Keywords: Fabric, Deformation, Granite, Tectonics, Microstructures, Anisotropy Of Magnetic Susceptibility (AMS), Central India Vi

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