Granitization

Introduction

  • It is the chemical alteration which can alter the source rock (sedimentary, igneous or metamorphic rock) into granatoid
  • It is a metamorphic process by which a solid rock is converted into a granitic rock by the entry and exit of material, without passing through a magmatic stage.
  • The process of granitization is intense in plutonic zones of strata in metamorphic zones especially in amphibolitic phase of plutonization.
  • The crystallization rock zones of Precambrian era the granitization is on the regional scale while today in younger strata they are restricted to local scale.
  • The process of granitization arises due to involvement of gaseous and liquid solutions which is formed deep inside the earth and has association with alkali and silica.
  • The sediments are transformed in their solid or partially molten state.
  • Various types of sub-processes such as solid-solution, diffusion, vapour transport are associated with it.
  • Some authors include in this term all granitic rocks formed from sediments by any process, regardless of the amount of melting or evidence of movement. The precise mechanism, frequency, and magnitude of the processes are still in dispute.