Archean Granitoids of India: Windows into Early Earth Tectonics

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.
Dissecting through the metallogenic potentials of Precambrian granitoids: case studies from the Bastar and Eastern Dharwar Cratons, India
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Published:December 14, 2020
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CiteCitation
Dinesh Pandit, Sourabh Bhattacharya, Mruganka K. Panigrahi, 2020. "Dissecting through the metallogenic potentials of Precambrian granitoids: case studies from the Bastar and Eastern Dharwar Cratons, India", Archean Granitoids of India: Windows into Early Earth Tectonics, S. Dey, J.-F. Moyen
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Abstract
The Malanjkhand granodiorite in the Bastar Craton hosts a major copper (+ molybdenum) deposit. It represents a Precambrian granite–ore system lacking in key morphological features of porphyry-type deposits but is comparable as a chemical package with a distinct mode of evolution of the magmatic-hydrothermal system. Mineral chemistry of biotite and apatite along with bulk geochemical data constrain critical parameters such as initial water and halogen contents of the magma. Evolution of the magmatic-hydrothermal fluid has been envisaged with available thermobarometric data. A quantitative ore genetic model in terms of efficiency of removal of metals and resultant mineralization in terms of quantity of metals has been attempted for the Malanjkhand deposit. The Eastern Dharwar Craton witnessed prolific granitic activities in multiple phases during the Late Archean and are spatially close to auriferous schist belts. Against a widely held view of a single metamorphogenic origin of metal and ore fluid, a granite–gold connection can be visualized for the auriferous schist belts of the Eastern Dharwar Craton through comparison of fluid characteristics in the granitoid and ore regimes and mineral chemical constraints. Although a quantitative genetic link between the granitoid and gold would need more data, a magmatic component of the ore fluid could be established based on the available information.
- apatite
- Archean
- Asia
- Bastar Craton
- biotite
- case studies
- copper ores
- depth
- Dharwar Craton
- electron probe data
- enrichment
- exsolution
- fluid inclusions
- geologic thermometry
- gold ores
- granites
- granodiorites
- igneous rocks
- inclusions
- India
- Indian Peninsula
- magmas
- metal ores
- metallogeny
- mica group
- molybdenum ores
- Neoarchean
- ore-forming fluids
- phosphates
- plutonic rocks
- potential deposits
- Precambrian
- sheet silicates
- silicates
- water content
- Malanjkhand Deposit
- Ramagiri-Penakacherla schist belt