Browsing by Author "Rudraswami, N.G."
Now showing items 1-20 of 41
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A unique corundum and refractory metal-nugget bearing micrometeorite P117
Rudraswami, N.G.; Reshma, K.; ShyamPrasad, M. (The Meteoritical Society, 2017)Micrometeorites provide a large range of samples sourced from a wide variety of planetary materials, thereby providing a scope for expanding the known inventory of solar system materials. Here we report the micrometeorite ... -
Ablation and chemical alteration of cosmic dust particles during entry into the earth`s atmosphere
Rudraswami, N.G.; ShyamPrasad, M.; Dey, S.; Plane, J.M.C.; Feng, W.; Carrillo-Sanchez, J.D.; Fernandes, D. (American Astronomical Society, 2016)Most dust-sized cosmic particles undergo ablation and chemical alteration during atmospheric entry, which alters their original properties. A comprehensive understanding of this process is essential in order to decipher ... -
Anthropogenic spherules in Zuari estuary, south west coast of India
Shetye, S.S.; Rudraswami, N.G.; Nandakumar, K.; Manjrekar, S. (2019)In this study we report silica rich anthropogenic spherules from the marine environment. We found spherical, dumbbell, teardrop and fused spherules in Zuari estuary (near the Dona paula jetty), south west coast of India. ... -
Characterisation, Sources and Flux of Unmelted Micrometeorites on Earth During the Last ~50,000 Years
ShyamPrasad, M.; Rudraswami, N.G.; DeAraujo, A.A.; Khedekar, V.D. (Nature Publishing Group, 2018)Dust dominates extraterrestrial flux on the earth (30,000 tonnes/yr), however only ~5% of the cosmic dust survives atmospheric entry which is basically in two forms: melted and unmelted. Melted micrometeorites undergo ... -
Chemical composition of Low Moor and Walker Company cannons in the Odisha State Maritime Museum, east coast of India
Tripati, S.; Behera, R.P.; Rudraswami, N.G.; Deshpande, P.P. (Current Science Association, IAS, 2022)Cannons are military or civil weapons supported on carriages or fixed mounts and used in warfare as well as against rebellions. Now, most of the cannons are exhibited in museums, forts, public and private buildings , and ... -
Chemical compositions of Fe-rich relict olivines from cosmic spherules, understanding their links with ordinary and carbonaceous chondrites
Fernandes, D.; Rudraswami, N.G.; Pandey, M; Singh, V.P. (John Wiley & Sons, Ltd, 2024)Fe-rich relict olivine grains are found in a small percentage of cosmic spherules, which are studied here to determine the nature of their precursors. We examined 128 Fe-rich relict olivine grains with Fa >10 mol% from 53 ... -
Chemical, isotopic and amino acid composition of Mukundpura CM2.0 (CM1) chondrite: Evidence of parent body aqueous alteration
Rudraswami, N.G.; Naik, A.K.; Tripathi, R.P.; Bhandari, N.; Karapurkar, S.G.; Prasad, M.S.; Babu, E.V.S.S.K.; VijayaSarathi, U.V.R. (Elsevier, 2019)The carbonaceous chondrites are intriguing and unique in the sense that they are the only rocks that provide pristine records of the early solar nebular processes. We report here results of a detailed mineralogical, chemical, ... -
Chemistry and petrology of Fe-Ni beads from different types of cosmic spherules: Implication for precursors
Rudraswami, N.G.; ShyamPrasad, M.; Babu, E.V.S.S.K.; VijayaKumar, T. (Elsevier, 2014)Fe–Ni beads are observed to occur in all three (Stony, Glass, Iron) types of cosmic spherules collected from deep sea sediments of the Indian Ocean. Fe–Ni beads in cosmic spherules can provide insights for understanding ... -
Chondrule-like object from the Indian Ocean cosmic spherules
Reshma, K.; Rudraswami, N.G.; ShyamPrasad, M. (Indian Academy of Sciences, 2013)Five hundred and eighteen cosmic spherules were identified among the 672 spherules handpicked from deep sea sediments by using Scanning Electron Microscope-Energy Dispersive Spectrometry (SEM-EDS). One of the spherules is ... -
Evaluating changes in the elemental composition of micrometeorites during entry into the earth`s atmosphere
Rudraswami, N.G.; ShyamPrasad, M.; Dey, S.; Plane, J.M.C.; Feng, W.; Taylor, S. (The American Astronomical Society, 2015)We evaluate the heating of extraterrestrial particles entering the atmosphere using the comprehensive chemical ablation model (CABMOD). This model predicts the ablation rates of individual elements in a particle with a ... -
Extraterrestrial components from deep sea sediments of Indian Ocean
Rudraswami, N.G.; ShyamPrasad, M. (Indian National Science Academy, 2016)Two different types of extraterrestrial particulate matter collections were undertaken during the last few years-by using magnets encased in dredges that were dragged along the seafloor and by sieving massive quantities ... -
Extraterrestrial dust as a source of bioavailable iron contributing to the ocean for driving primary productivity
Rudraswami, N.G.; Pandey, M.; Genge, M.J.; Fernandes, D. (Wiley, 2021)Bioavailable Fe is an essential nutrient for phytoplankton that enables the organisms to flourish and draw down atmospheric CO2 thus affecting global climatic conditions. In marine locales, remote from the continents, ... -
Fine-grained volatile components ubiquitous in solar nebula: Corroboration from scoriaceous cosmic spherules
Rudraswami, N.G.; Fernandes, D.; Naik, A.K.; ShyamPrasad, M.; Taylor, S. (John Wiley & Sons, 2018)The scoriaceous cosmic spherules (CSs) that make up to a few percent (for sizes >150 -m size) of total micrometeorite flux are ubiquitous and have remained enigmatic. The present work provides in-depth study of 81 scoriaceous ... -
Fractionation and fragmentation of glass cosmic spherules during atmospheric entry
Rudraswami, N.G.; ShyamPrasad, M.; Babu, E.V.S.S.K.; VijayaKumar, T.; Feng, W.; Plane, J.M.C. (Elsevier, 2012)Glass cosmic spherules are a sub-type of S-type cosmic spherules that are almost at the end phase of fractionation and volatilization during atmospheric entry. A focused investigation of 36 glass spherules out of several ... -
Fremdlinge type object in a cosmic spherule from the Indian Ocean
Rudraswami, N.G.; ShyamPrasad, M. (Lunar and Planetary Institute (LPI), 2013)The article presents here the discovery of a fremdlinge-type object from the cosmic spherule collection from Indian Ocean which survived atmospheric entry. -
Geochemical evaluation of cosmic spherules collected from the Central Indian Ocean Basin
Pandey, M.; Rudraswami, N.G.; Singh, Vijay; Viegas, A. (Elsevier, 2023)Micrometeorites (MMs) significantly contribute to the extraterrestrial material the Earth receives and represent a broader range of precursors than known meteorites. Low sedimentation rates prevalent in the deep-sea regions ... -
Geochemistry of aerodynamically distorted Australasian microtektites: Implications for ejecta on Mars and Venus
Rudraswami, N.G.; Prasad, M.S.; Iyer, S.D.; Pandey, M.; Helo, C.; Panda, D.K. (Springer, 2021)We report microtektites recovered from a large area of the deep seafloor (Central Indian Ocean) that appear to have undergone aerodynamic distortion during re-entry into the atmosphere. Considering the geographic locations, ... -
Glass spherules from Antarctica blue ice and deep-sea sediment of the Central Indian Ocean Basin
Fernandes, Dafilgo; Rudraswami, N.G.; Pandey, M.; Kotha, M. (Springer, 2021)We report the chemical composition of 176 glass spherules obtained from Antarctica blue ice and deep-sea sediments from the Central Indian Ocean Basin. This study compares the chemistry of glass spherules collected from ... -
In situ oxygen isotope compositions in olivines of different types of cosmic spherules: An assessment of relationships to chondritic particles
Rudraswami, N.G.; ShyamPrasad, M.; Jones, R.H.; Nagashima, K. (Elsevier, 2016)Cosmic spherules collected from deep sea sediments of the Indian Ocean having different textures such as scoriaceous (4), relict-bearing (16), porphyritic (35) and barred olivine (2) were investigated for petrography, as ... -
In-situ O-isotope analysis of relict spinel and forsterite in small (<200µm) Antarctic micrometeorites - Samples of chondrules & CAIs from carbonaceous chondrites
Rudraswami, N.G.; Suttle, M.D.; Marrocchi, Y.; Taylor, S.; Villeneuve, J. (Elsevier, 2022)We report high-precision secondary ion mass spectrometer triple oxygen isotope systematics (95 individual analyses) from 37 micrometeorites (MMs) collected from South Pole Water Well (SPWW), Antarctica. The study population ...