Archean Granitoids of India: Windows into Early Earth Tectonics
CONTAINS OPEN ACCESS

Granitoids form the bulk of the Archean continental crust and preserve key information on early Earth evolution. India hosts five main Archean cratonic blocks (Aravalli, Bundelkhand, Singhbhum, Bastar and Dharwar). This book summarizes the available information on Archean granitoids of Indian cratons. The chapters cover a broad spectrum of themes related to granitoid typology, emplacement mechanism, petrogenesis, phase-equilibria modelling, temporal distribution, tectonic setting, and their roles in fluid evolution, metal delivery and mineralizations. The book presents a broader picture incorporating regional- to cratons-scale comparisons, implications for Archean geodynamic processes, and temporal changes thereof. This synthesis work, integrating modern concepts on granite petrology and crustal evolution, offers an irreplaceable body of reference information for any geologist interested in Archean Indian granitoids.
Application of anisotropy of magnetic susceptibility (AMS) in understanding regional deformation, fabric development and granite emplacement: examples from Indian cratons Available to Purchase
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Published:December 14, 2020
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CiteCitation
Manish A. Mamtani, Sandeep Bhatt, Virendra Rana, Koushik Sen, Tridib K. Mondal, 2020. "Application of anisotropy of magnetic susceptibility (AMS) in understanding regional deformation, fabric development and granite emplacement: examples from Indian cratons", Archean Granitoids of India: Windows into Early Earth Tectonics, S. Dey, J.-F. Moyen
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Abstract
In this paper the authors review various applications of analysing fabric in granites from Indian cratons using anisotropy of magnetic susceptibility (AMS). First the general importance of AMS in identifying the internal fabric in massive granitoids devoid of visible foliations/lineations is highlighted. Subsequently, three important applications of AMS in granitoids are discussed. (a) The case of Godhra Granite (southern parts of the Aravalli Mountain Belt) is presented as an example of the robustness of AMS in working out the time relationship between emplacement/fabric development and regional deformation by integrating field, microstructural and magnetic data. (b) AMS orientation data from Chakradharpur Granitoid (eastern India) are compared with field-based information from the vicinity of the Singhbhum Shear Zone to highlight the use of AMS in kinematic analysis and vorticity quantification of syntectonic granitoids. (c) Magnetic fabric orientations from the Mulgund Granite (Dharwar Craton) are presented to document the application of AMS in recognizing superposed deformation in granitoids. Moreover, AMS data from Mulgund Granite are also compared with data from another pluton of similar age ( c.2.5 Ga) from the Dharwar Craton (Koppal Granitoid; syenitic composition). This highlights the use of AMS from granitoids of similar absolute ages in constraining the age of regional superposed deformation.
- anisotropy
- Aravalli Range
- Aravalli System
- Archean
- Asia
- banded gneiss
- cratons
- deformation
- Dharwar Craton
- emplacement
- fabric
- gneisses
- granites
- igneous rocks
- India
- Indian Peninsula
- kinematics
- magnetic properties
- magnetic susceptibility
- metamorphic rocks
- microstructure
- paleomagnetism
- petrography
- plutonic rocks
- Precambrian
- Rajasthan India
- Singhbhum shear zone
- syntectonic processes
- tectonics
- Lunavada Group
- Champaner Group
- Godhra Granite
- Chakradharpur Granitoid
- Mulgund Granite
- Koppal Granitoid