Geological Map of India

Geological Map of India
Name	Geological Map of India
Caption	Generalized depiction of lithological provinces of the Indian subcontinent
Country	India
Authority	Geological Survey of India
Scale	variable
Year	ongoing

Geological Map of India

The Geological Map of India is a cartographic synthesis that delineates lithological units, structural features, and mineral occurrences across the Indian subcontinent, produced principally by the Geological Survey of India and used by agencies such as the Ministry of Mines, Ministry of Coal, Oil and Natural Gas Corporation, and Council of Scientific and Industrial Research. The map integrates field mapping traditions from the era of James Prinsep, institution-building from the period of Lord Dalhousie, stratigraphic frameworks influenced by workers like F. H. Hatch, and tectonic concepts tied to theories advanced by Alfred Wegener and John Tuzo Wilson.

Overview and Purpose

The map serves to document lithology, stratigraphy, structural geology, and mineralization across states such as Maharashtra, Rajasthan, Karnataka, Andhra Pradesh, and West Bengal, informing policy instruments in bodies like the Ministry of Environment, Forest and Climate Change and the National Disaster Management Authority. It synthesizes data from projects led by institutions including the Indian Institute of Science, Banaras Hindu University, Indian Institute of Technology Bombay, Indian Institute of Technology Madras, and international collaborators such as the United States Geological Survey and British Geological Survey to support exploration by firms like Vedanta Resources, Coal India Limited, Reliance Industries, and ONGC. Users range from planners at the Central Water Commission and the National Highways Authority of India to conservationists at the World Wildlife Fund and researchers at the Indian Space Research Organisation.

Geological Provinces and Rock Units

The map partitions the subcontinent into provinces including the Deccan Traps, the Peninsular Gneissic Shield (encompassing the Aravalli Range, Shimoga Belt, and Eastern Ghats Mobile Belt), the Himalayan orogen with units like the Tethys Himalaya and the Siwalik Group, and sedimentary basins such as the Ganges Basin, Indus Basin, Godavari Basin, and Krishna–Godavari Basin. It records volcanic provinces like the Vindhyan Supergroup margins adjacent to the Chotanagpur Plateau and records Precambrian assemblages including the Singhbhum Craton, Bastar Craton, and the Dharwar Craton. Major rock types mapped include basalts, granites, gneisses, schists, carbonates in the Kurnool Group, and siliciclastic successions in the Cambay Basin.

Stratigraphy and Geological History

Stratigraphic columns on the map reflect sequences from Archean units such as the Archean greenstone belts of Karnataka through Proterozoic formations including the Vindhyan Supergroup and Cuddapah Basin to Phanerozoic successions of the Jurassic and Cretaceous represented in the Ladakh Complex and Kutch Basin. The map encodes episodes tied to events like the Pan-African orogeny, the Indian Plate drift and Indian–Eurasian collision, rifting related to the breakup of Gondwana, and flood basalt eruptions associated with the Deccan Traps at the Cretaceous–Paleogene boundary contemporaneous with global signals recorded at sites studied by researchers from the Natural History Museum, London and the Smithsonian Institution.

Tectonics and Structural Features

Structural symbols depict major faults such as the Himalayan Frontal Thrust, the Main Boundary Thrust, the Kutch Mainland Fault, and intracratonic shear zones including the Eastern Ghat Shear Zone and the Narmada–Son Lineament that influence seismicity monitored by the India Meteorological Department and the National Centre for Seismology. The map integrates plate reconstructions developed at institutions like the University of Cambridge and Lamont–Doherty Earth Observatory to illustrate the motion of the Indian Plate relative to the Eurasian Plate and the Arabian Plate, and documents structural styles relevant to folding in the Himalaya and basin inversion in the Rajasthan Basin.

Mineral Resources and Economic Geology

Mapped resources include coalfields of Jharia, Raniganj, and Singrauli; iron ores of Kudremukh and Bailadila; bauxite deposits in Koraput; manganese in Balaghat; gold in the Kolar Gold Fields and Wayanad; hydrocarbons in the Mumbai High and KG Basin; and strategic minerals such as rare earths at Manavalakurichi and uranium occurrences in Jharkhand and Nalgonda District. The map underpins exploration by agencies such as the Atomic Minerals Directorate for Exploration and Research, NHPC Limited, and multinational miners including Tata Steel and Hindustan Zinc.

Map Production, Scale, and Methodology

Cartography follows standards promulgated by the Geological Survey of India and uses scales from 1:50,000 to 1:1,000,000, combining field mapping, petrographic studies at university laboratories, geochemical analyses performed at facilities like the Council of Scientific and Industrial Research laboratories, and geophysical surveys (seismic, gravity, magnetic) executed by groups including ONGC and the National Geophysical Research Institute. Remote sensing inputs from the Indian Space Research Organisation missions such as IRS and Cartosat, and GIS frameworks like QGIS and proprietary systems are integrated, while stratigraphic nomenclature references stratotypes housed in institutions like the Geological Museum, Kolkata.

Applications and Implications for Land Use and Hazards

Planners and hazard managers in organizations such as the National Disaster Management Authority, Central Public Works Department, and state authorities rely on the map for siting infrastructure in states like Uttar Pradesh and Gujarat, assessing landslide susceptibility in the Northeast India and the Himalayan foothills, evaluating floodplain geology along the Ganges and the Brahmaputra, and guiding groundwater exploration for agencies including the Central Ground Water Board. The map informs heritage conservation at sites like Hampi and Ajanta Caves, supports climate-resilience planning coordinated with the Ministry of Earth Sciences, and aids international collaborations with bodies such as the United Nations Educational, Scientific and Cultural Organization.

Category:Geology of India Category:Geological maps