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dc.contributor.authorFernandes, D.
dc.contributor.authorRudraswami, N.G.
dc.contributor.authorPandey, M
dc.contributor.authorSingh, V.P.
dc.date.accessioned2024-03-31
dc.date.accessioned2024-09-12T10:37:05Z
dc.date.available2024-03-07
dc.date.available2024-09-12T10:37:05Z
dc.date.issued2024
dc.identifier.citationMeteoritics & Planetary Science, vol.59(3); 2024; 605-625
dc.identifier.issn1945-5100
dc.identifier.otherhttps://onlinelibrary.wiley.com/doi/full/10.1111/maps.14143
dc.identifier.urihttps://doi.org/10.1111/MAPS.14143
dc.identifier.urihttp://drs.nio.res.in/drs/handle/2264/9214
dc.descriptionIF(JCR2023) = 2.2
dc.description.abstractFe-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 cosmic spherules of different types collected from Antarctica (Antarctica micrometeorites [AMM]) and deep-sea sediments (DSS) of the Indian Ocean. Fe-rich olivines identified in cosmic spherules are close analogs of type II chondrule olivines formed in the early solar system. The olivine analysis shows well-defined trends in molar Fe/Mn versus Fe/Mg with an affinity for ordinary and carbonaceous chondrites. The minor oxides in olivine are in ranges such as MnO ~0.1-0.8 wt%, Cr2O3 ~0-0.7 wt%, CaO ~0-0.6 wt%, and Al2O3 ~0-0.2 wt%, respectively. The chemical composition suggests that the precursors for these Fe-rich olivine-bearing cosmic spherules consist of ordinary chondrites (~21%-23%, AMM-DSS), carbonaceous chondrites (~17%-36%, AMM-DSS), and a large fraction overlapping both carbonaceous and ordinary chondrites (~41%-62% AMM-DSS). The elemental ratios Fe/Si/CI and Mg/Si/CI for the Fe-rich relict olivines ranging between the values 0.5-1.0 and 1.1-1.7 are compatible with IDPs, Comet 81P/Wild 2 as well as the Asteroid Itokawa and Ryugu, which are indistinguishable from carbonaceous and ordinary chondrites. In addition, pyroxene and olivine assemblages in their Fa versus Fs mol% show strong similarities to EOC chondrites. Our results on Fe-rich relict olivines show that these grains in cosmic spherules are less common than Mg-rich olivines, which show a narrow range of chemical compositions identical to those from ordinary chondrites and carbonaceous chondrites, indicating a supplementary contribution of an ordinary chondritic component to the micrometeorite source of dust.
dc.languageen
dc.publisherJohn Wiley & Sons, Ltd
dc.relation.isreferencedbySCI
dc.rightsOnly the author version of the copright reserved papers uploaded. Contact drs@nio.org for any complaints regarding copyright violations
dc.titleChemical compositions of Fe-rich relict olivines from cosmic spherules, understanding their links with ordinary and carbonaceous chondrites
dc.typeJournal Article
dc.affiliation.authorCSIR-National Institute of Oceanography, Dona Paula, Goa, India


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