A5030080701- Geological and Geochemical Analysis
- earthquake and tectonic studies
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Geology and Paleoclimatology Research
- Paleontology and Stratigraphy of Fossils
- Planetary Science and Exploration
- Geological and Geophysical Studies
- Geomagnetism and Paleomagnetism Studies
- Evolution and Paleontology Studies
- Geological formations and processes
- Geological Studies and Exploration
- Geochemistry and Elemental Analysis
- Geological and Geophysical Studies Worldwide
- Astro and Planetary Science
- Geological and Tectonic Studies in Latin America
- Mineralogy and Gemology Studies
- Hydrocarbon exploration and reservoir analysis
National Centre for Earth Science Studies
2017-2024
Korea Polar Research Institute
2024
Indian Institute of Technology Kharagpur
2023
Ministry of Earth Sciences
2023
Government of India
2023
Presidency University
2016
Indian Institute of Science Education and Research Kolkata
2014
Phase equilibria modelling coupled with U–Pb zircon and monazite ages of garnet–cordierite gneiss from Vallikodu Kottayam in the Kerala Khondalite Belt, southern India are presented here. The results suggest that area attained peak P–T conditions ~900 °C at 7.5–8 kbar, followed by decompression to 3.5–5 kbar cooling 450–480 °C, preserving signatures partial melting event field high ultra-high temperature metamorphism. Melt reintegration models up 35% granitic melt could have been...
Abstract The Precambrian Southern Granulite Terrane (SGT) of south India is well-known for the preservation high- to ultrahigh-temperature (HT-UHT) granulites, prominently exposed in its central part forming a linear belt referred as Kambam UHT belt. This also hosts widespread occurrences mafic granulites that are observed close spatial association with HT-UHT granulites. study presents detailed petrology, geochemistry and geochronology representative from area understand their petrogenesis...
The Madurai block, the largest crustal block in Precambrian Southern Granulite Terrane of south India, preserves rare assemblages high- to ultrahigh-temperature metamorphic rocks. These rocks bear exclusive evidence for high thermal regime prevalent during their formation and can be constrained from accessory phases such as zircon, monazite garnet. Here, we present P-T-t evolutionary history garnet-cordierite-spinel granulites different localities block. Combined petrography, mineral...
Rocks of the Lesser Himalayan Sequence are important from a global tectonic perspective as they represent crucial evolutionary chronicle Indian continent Paleoproterozoic to Cenozoic orogeny. Eroded remnants tectonically transported crystalline thrust sheets overlying metasedimentary zone along Main Central represented by Almora, Baijnath, Askot, and Chiplakot klippen belts in Kumaun Himalaya, India. In this work, we present deformation history, geochemistry, U-Pb zircon-apatite...
Mg-Al granulites and associated metapelites occurring in a shear zone at the contact of Archean Bastar Craton Proterozoic Eastern Ghats Province (EGP) have been studied here. Reaction textures, geothermobarometry P-T pseudosection studies reveal that rocks record ultrahigh peak temperatures (>900 °C) pressures 8–8.5 kbar were exhumed along retrograde decompression-cooling trajectory reaching ∼770 °C 5–6 following an overall clockwise path. Texturally constrained in-situ monazite chemical...
The Nagercoil block situated at the southernmost tip of India occupies a key position in East Gondwana collisional tectonic models. is dominated by Orosirian I-type charnockite massifs that host numerous gabbroic emplacements. Our present understanding about crustal architecture derived mostly from these charnockites, while detailed studies on gabbros are lacking. We new petrology, geochemistry, and zircon U-Pb/Hf isotopic data to understand their petrogenesis significance. results reveal...
Abstract The present work is focussed on a suite of high-grade rocks including mafic granulite, aluminous khondalite, charnockite, and augen gneiss along with medium-grade like olivine-bearing metanorite, gabbro, porphyritic granite the Angul domain at northern margin Proterozoic Eastern Ghats Province (EGP). Based petrological geothermobarometric data, two distinct metamorphic events have been identified. imprints earlier event (MA1) are preserved in gneiss, fine-grained but those best...
Mafic granulites occur as enclaves within host mylonitized felsic rocks along the WNW-ESE trending, northerly dipping (40°-80°) Mahanadi Shear Zone (MSZ) of Eastern Ghats Province (EGP), eastern India. granulite are characterized by mineral assemblages Grt+Cpx+Pl+Qtz±Opx±Hbl±Bt (type-1) and Opx+Cpx+Pl+Hbl±Bt (type-2). The type-1 mafic is focus present study this rock occurs small (up to a few tens meters in maximum size) mylonitic augen...
Medium‐grade metamorphic rocks representing metapelites, calc‐silicates and metavolcanics constitute the of Alwar Khetri sub‐basins North Delhi Fold Belt (NDFB) in southern Haryana adjacent western Rajasthan. Using modern petrological tools including pseudosection modelling, we describe metamorphism these two show that reported westward increasing grade NDFB is non‐tenable. We that, if anything, decreases from central sub‐basin to sub‐basin. Clockwise segments P‐T paths are constructed using...
The Angul-Tikarpara domain of the northern Eastern Ghats Province (EGP) India is characterized by high-grade rocks like felsic gneiss, khondalite (garnet-sillimanite-K-feldspar-quartz bearing granulite), charnockite, mafic granulite and aluminous (spinel-magnetite-hematite-garnet-cordierite-sillimanite-K-feldspar-quartz-biotite-plagioclase). Two distinct mineralogical varieties are present as enclaves within gneiss coarse-grained charnockite. Type-A composed orthopyroxene, clinopyroxene,...
Abstract Hydrous Cr‐bearing uvarovite garnets are rare in natural occurrences and belong to the ugrandite series exist binary solid solutions with grossular andradite garnets. Here, we report occurrence of hydrous garnet having Cr 2 O 3 upto 19.66 wt% CaO 32.12–35.14 serpentinized mantle peridotites Naga Hills Ophiolite (NHO), India. They occur association low‐Cr diopsides. enriched LILE (Ba, Sr), LREEs, fractionating LREE‐MREE [avg. (La/Sm) N = 2.16] flat MREE/HREE patterns (Sm/Yb) 0.95]....