Browsing by Author "ShyamPrasad, M."
Now showing items 1-20 of 47
-
A tektite fragment discovered in the Central Indian Basin
ShyamPrasad, M.; Mislankar, P.G.; Charan, S.N.; Prasad, K. (Current Science Association, 1998)On the basis of various lines of evidence, tektites are now considered as glassy objects generated by meteorite impacts, distributed in four known strewn fields, of which, the Australasian tektite strewn field is the ... -
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 ... -
Ablated tektite from the central Indian Ocean
Glass, B.P.; Chapman, D.R.; ShyamPrasad, M. (Meteoritical Society, Fayetteville, USA, 1996)A well-preserved ablated (button-shaped) tektite recovered from the surface sediments of the central Indian Ocean lacks flow ridges and has apparently undergone ablation of 6.9 to 7.9 mm. The lack of flow ridges and amount ... -
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 ... -
Australasian microtektites from the Central Indian Basin: Implications for ejecta distribution patterns
ShyamPrasad, M.; Sudhakar, M. (Current Science Association, Bangalore, India, 1996)Microtektites belonging to the Australasian tektite strewn field have been recovered in one (SK-16/176) out of three cores examined from the Central Indian Basin. The microtektites have been identified based on their ... -
Australasian microtektites in a substrate: A new constraint on ferromanganese crust accumulation rates
ShyamPrasad, M. (Elsevier, 1994)Microtektites belonging to the Australasian tektite strewn field are found in the substrate of a ferromanganese crust dredged from the Central Indian Basin. They are identified on their physical appearance, geographic ... -
Australian minitektites discovered in the Indian Ocean
ShyamPrasad, M.; Sudhakar, M. (Meteoritical Society, Fayetteville, USA, 1999)Large area sampling with a box core in the Indian Ocean has led to the discovery of minitektites (> 1-3.75 mm long) and a tektite fragment (approx 1.25 mm) occuring with microtektites belonging to the Australasian tektite ... -
Changes in abundance and nature of microimpact craters on the surfaces of Australasian microtektites with distance from the proposed source crater location
ShyamPrasad, M.; Roy, S.K.; Gupta, A. (Wiley-Blackwell, 2010)Over 4600 Australasian microtektites from 11 sediment cores along an N-S transect in the Central Indian Ocean have been investigated optically for microimpact features on their surfaces. Detailed scanning electron microscope ... -
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 ... -
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 ... -
Correlation of the oldest Toba Tuff to sediments in the central Indian Ocean Basin
Pattan, J.N.; ShyamPrasad, M.; Babu, E.V.S.S.K. (Indian Academy of Sciences, 2010)We have identified an ash layer in association with Australasian microtektites of approx. 0.77Ma old in two sediment cores which are approx. 450 km apart in the central Indian Ocean Basin (CIOB). Morphology and chemical ... -
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 ... -
Evidence for recent hydrothermal activity in the Central Indian Basin
Iyer, S.D.; ShyamPrasad, M.; Gupta, S.M.; Charan, S.N. (Pergamon, 1997)This study documents the first actual prof of recent intraplate volcanic-hydrothermal activity in the Central Indian Basin (CIB). Twenty-six surface sediments and a spade core (37 cm long) from the CIB were examined for ... -
Exploration for nodules in the Central Indian Ocean Basin: Past present and the future
ShyamPrasad, M. (Regional Research laboratory, Bhubaneswar, 2005)The Polymetallic Nodules Project has a long (less than 2 decades)history. Initially, the Surveys and Exploration aspect was the driving force for this project. The project was initiated with the recovery of manganese nodules ... -
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 matter in the oceans
ShyamPrasad, M. (National Institute of Oceanography, India, 2007) -
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.