What is the Eastern Ghats Mobile Belt (EGMB)? The Proterozoic Eastern Ghats Mobile Belt (EGMB) extends for about 1000 km in a NE direction from Ongole in Andhra Pradesh in the south to Brahmani River in Orissa in the north, with a maximum width of about 300 km. It lies along the eastern margin of […]
Deterioration of Land Quality: The United Nations celebrated 2015 as the ‘World Soil Year’ and designated 2015-2024 as the ‘International Decade of Soils.’ India, with the 10th largest cultivable land resource globally, hosts 46 out of 60 soil types found worldwide. National and international agencies predict a future decline in cultivable land and soil fertility
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Aravalli Craton What areas does the Aravalli Craton cover? The Aravalli Craton covers over one lakh(100000) sq. km, including the entire state of Rajasthan, parts of Gujarat, Madhya Pradesh, and fringes of Delhi and Haryana. What are the main components of the composite Aravalli Craton? The composite Aravalli Craton consists of the Mewar Craton in
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The Bundelkhand Craton is a 26,000 sq. km Archean cratonic block in central India, characterized by a triangular geometry with semi-circular sides. It is named after the 15th-century Bundelkhand kingdom. This geological formation contains tonalite-trondhjemite-granodiorite (TTG) gneisses dating from 3.55–2.5 Ga, Bundelkhand granite complexes, and distinctive supracrustal rock enclaves. The craton is bounded by the Son-Narmada lineament in the south, separated from the Aravalli craton by the Vindhyan basin in the west, and overlain by Indo-Gangetic alluvium in the north.
UGC-NET June 2024 Examination Cancellation Why was the UGC-NET June 2024 Examination cancelled? The UGC-NET June 2024 Examination, held on 18th June 2024, has been cancelled following serious concerns about the integrity of the exam. On 19th June 2024, the University Grants Commission (UGC) received inputs from the National Cyber Crime Threat Analytics Unit of
Introduction of Singhbhum Craton? Singhbhum Craton covers a triangular area of 50,000 sq. km and consists of a core (8,000 sq. km) of Singhbhum granite, rimmed by supracrustals of varied character and age. It covers Jharkhand, Odisha, and adjoining areas in the eastern part of the Indian Shield. Location and Boundaries of Singhbhum Craton The
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Bastar Craton covers an area of 130,000 sq. km and is bounded by the Godavari graben in the south, Mahanadi graben in the north-east, Central Indian Tectonic Zone (CITZ) forming part of the Satpura mobile belt in the north, Eastern Ghats mobile belt in the east, and Deccan Trap cover in the west. Bastar craton
The Indian shield consists of five major Archean Cratons: Dharwar, Bastar, Singhbhum, Bundelkhand, and Aravalli. The Indian shield, comprising the Precambrian basement, is primarily made up of granitic gneisses and migmatites, known as the Peninsular Gneiss or Fundamental Gneiss. The Peninsular Gneiss was emplaced on an older Greenstone belt, a relic of the Primordial Crust,
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Chronostratigraphy Introduction Lithology (Lithostratigraphy): The stratigraphic units described in the preceding lectures are rock units distinguished by: Magnetic characteristics Fossil content (Biostratigraphy) Seismic reflection characteristics To interpret Earth’s history, stratigraphic units must be related to geologic time. The ages of rock units must be known. Chronostratigraphy: Establishing the time relationship among rock units is called
The characterization and correlation of rock units on the basis of their fossil content is called biostratigraphy. It is fundamentally different from a lithostratigraphic unit that is defined by the lithological properties of the rock. The concept of biostratigraphy is based on the principle that organisms have undergone successive changes throughout geologic time. Thus, any