A5069013082- Methane Hydrates and Related Phenomena
- Astro and Planetary Science
- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Astronomical Observations and Instrumentation
- Planetary Science and Exploration
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geomagnetism and Paleomagnetism Studies
- Offshore Engineering and Technologies
- Spacecraft and Cryogenic Technologies
- Geochemistry and Geologic Mapping
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Geological and Geophysical Studies
- Astronomy and Astrophysical Research
- Geochemistry and Elemental Analysis
- Geological Modeling and Analysis
- Hydrocarbon exploration and reservoir analysis
- Nuclear Physics and Applications
- Atmospheric Ozone and Climate
- Inertial Sensor and Navigation
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
- Paleontology and Stratigraphy of Fossils
Pondicherry University
2015-2024
University of Massachusetts Amherst
2023
University of Kashmir
2020
Geological Survey of India
2003-2004
Physical Research Laboratory
2001
Spinifex-textured, magnesian (MgO >25 wt.%) komatiites from Mesoarchean Banasandra greenstone belt of the Sargur Group in Dharwar craton, India were analysed for major and trace elements 147,146Sm-143,142Nd systematics to constrain age, petrogenesis understand evolution Archean mantle. Major element ratios such as CaO/Al2O3, Al2O3/TiO2, Gd/Yb, La/Nb Nb/Y suggest aluminium undepleted enriched compositional range these komatiites. The depth melting is estimated be varying 120 240 km...
We present 40 Ar‐ 39 Ar ages of 60.4±0.6 Ma and 61.8±0.6 (2σ) for Deccan Trap trachytes from Manori Saki Naka, Bombay, situated in the tectonized Panvel flexure zone along western Indian rifted continental margin. These provide clear evidence that (i) these are Palaeocene age therefore substantially younger than lower part main flood basalt sequence exposed Western Ghats, which precedes K‐T Boundary (ii) formation west coast must have been subsequent to ∼60 Ma. Considering early alkaline...
The Proterozoic felsic and mafic magmatism in India varied tectonic settings is reviewed discussed based on available geological, geochemical, geochronological constraints.Neoarchean-Paleoproterozoic magmatism, as discrete volcanoplutonic complexes Large Igneous Provinces (LIPs) the Bastar, Singhbhum Dharwar cratons associated mobile belts are also included.Paleoproterozoic contributed to geodynamics of Himalaya.Meso-to Neoproterozoic comprises kimberlites lamproites Bastar...
Several different geochemical signatures, i.e., mid-oceanic ridge (MOR) and supra subduction zone (SSZ), are frequently reported from ophiolite belts. Such bi-modal signatures generally interpreted in terms of formation two contrasting tectonic settings: divergent convergent settings with associated petrogenetic processes. Whilst MOR-like SSZ-like well understood general terms, their combined occurrence the peridotite component belts is not fully understood. Here, we describe geochemically...
The Banded Gneissic Complex (BGC) of the Aravalli Craton is divided into BGC-I and BGC-II; BGC-II (central Rajasthan) comprised Sandmata Mangalwar Complex. We report elemental Nd-isotope geochemistry basement gneisses constrain its origin evolution. Geochemically, have been classified as low-SiO2 (LSG) high-SiO2 (HSG). Both LSG HSG are potassic, calc-alkaline peraluminous in nature. enriched incompatible (K, Sr, Ba, large ion lithophile elements) compatible elements (MgO, Cr, Ni). They...
Abstract This study reports, for the first time, Sr and Nd isotope ratios from mafic rocks in Manipur Ophiolite Complex (MOC), along with new elemental abundances to show subduction zone influence. The initial 87 Sr/ 86 (for t = 127 Ma) range 0.705230 0.709734. 143 Nd/ 144 ɛ ( 0.512611 0.512900 +2.7 +8.3, respectively. high field strength element (HFSE) vary widely, Nb/Ta ranging c. 3 18 Zr/Hf 20 41, indicating fluid–rock interaction presence of rutile. correlated variation HFSEs, including...
The Spongtang ophiolite (Ladakh, NW India) constrains the nature of oceanic lithosphere before Indo-Asia collision and key stages in development Himalayas. We report whole-rock 40 Ar/ 39 Ar situ zircon 238 U– 206 Pb ages from its crustal upper lower mantle sequences. Major trace elements harzburgite minerals suggest that formed at a mid-ocean ridge-type spreading centre, whereas published spinel compositions dunites are consistent with suprasubduction-zone setting. Rare earth...