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dc.contributor.authorParashar, K.
dc.contributor.authorShyamPrasad, M.
dc.contributor.authorChauhan, S.S.S.
dc.date.accessioned2017-09-27T13:03:21Z
dc.date.available2017-09-27T13:03:21Z
dc.date.issued2010
dc.identifier.citationEarth Moon Planets, vol.107(2-4); 2010; 197-217
dc.identifier.urihttp://drs.nio.org/drs/handle/2264/5137
dc.description.abstractWe collected 1,245 spherules from the Central Indian Ocean basin by Magnetic cosmic dust collection (MACDUC) experiment raking the deep sea floor. This collection ranks among the large deep sea collections of cosmic dust. For this study, 168 particles are analyzed with SEM-EDS to characterise their cosmic nature and identify the processes that their morphological features, textures and chemical compositions reveal. All the three basic types of cosmic spherules have been identified: I-type, S-type and the G-type. The silicate or the S-type spherules are dominant in this collection. In all, 115 spherules were sectioned, polished and analyzed for major elements. I-type spherules are mainly composed of Fe and Ni oxides, some have metallic cores where appreciable amounts of Co is observed in addition to glassy phases with lithophile elements are also observed in these spherules. These evidences are supportive of the view that the I-type spherules could be metal grains from carbonaceous/unequilibrated chondritic bodies. The S-type spherules show elemental composition of Mg, Al, Si, Ca, Fe, and Ni approximately similar to chondritic compositions. In addition, some other rare particles such as an S-type sphere which contains a large zoned relict chromite crystal, other spheres with a semi-porphyritic/barred olivine texture are also observed. While most the S-type spherules appear to have carbonaceous chondrites as their parent bodies, the relict grain bearing spherule shows distinctly an ordinary chondritic parent body
dc.language.isoen
dc.publisherSpringer
dc.rightsAn edited version of this paper was published by Springer. This paper is for R & D purpose and Copyright [2010] Springer
dc.titleInvestigations on a large collection of cosmic dust from the central Indian Ocean.
dc.typeJournal Article


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