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Minor elements in relict olivine grains of deep-sea spheres: Match with Mg-rich olivines from C2 meteoritesThe bulk composition and relict minerals of meteoroid ablation spheres from deep sea sediments can be related to the parental material, and bulk compositions and elemental ratios favor a CI/CM affinity for most spheres. Although largely melted, some deep sea spheres (DSS) have retained rare grains apparently unmodified chemically by ablation heating or seawater alteration. Minor elements in relict olivines for comparison with compositions of olivines in known meteorites were analyzed. All relict olivines are very Mg rich. No terrestrial olivines match the chemical features which reinforces other evidence for an extraterrestrial origin. There is no match with achondritic olivines. Mg rich olivines occur in all types of carbonaceous meteorites, but the minor elements of most DSS olivines do not match with those for Allende (C3) olivines, and fit poorly with those of Murchison (C2) olivines. There is a good fit for Fe and Cr with those of the olivines in the unusual Belgica 7904 (C2) meteorite (3). It seems likely that the relict olivines of at least many deep sea spheres are chemically related to olivines in at least one C2 meteorite.
Document ID
19850007301
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Smith, J. V.
(Chicago Univ. Chicago, IL, United States)
Steele, I. M.
(Chicago Univ. Chicago, IL, United States)
Brownlee, D. E.
(Washington Univ. Seattle, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Publication Information
Publication: Lunar and Planetary Institute The 47th Ann. Meteoritical Soc. Meeting
Subject Category
Lunar And Planetary Exploration
Accession Number
85N15610
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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