| タイトル | The Diversity of Anomalous HEDs: Isotopic Constraints on the Connection of EET 92023, GRA 98098, and Dhofar 700 With Vesta |
| 本文（外部サイト） | http://hdl.handle.net/2060/20160003148 |
| 著者（英） | Yin, Q.-Z.; Mittlefehldt, D. W.; Sanborn, M. E. |
| 著者所属（英） | NASA Johnson Space Center |
| 発行日 | 2016-03-21 |
| 言語 | eng |
| 内容記述 | The possibility for multiple parent bodies, instead of a common parent body of Vesta, for eucrites has been suggested based on the variable oxygen isotopic composition observed in some eucrites.. Recently, we added an extra dimension to the discussion based on the (epsilon)54Cr composition of the same eucrites with known (delta)17O to compare with the normal eucrites. The combined (delta)17O and (epsilon)54Cr isotope systematics for Pasamonte, PCA 91007, A-881394, and Ibitira indicate their likely origin from multiple different parent bodies than the normal eucrites. Often the qualifier anomalous is used to identify HEDs with (delta)17O values that deviate significantly (>3(sigma)) from the mean HED (delta)17O. However, variations in eucrites and diogenites also include unique geochemical characteristics such as bulk composition, trace element abundances, or volatile concentrations, in addition to (delta)17O. Here, we investigate three such geochemically anomalous HEDs: Elephant Moraine (EET) 92023, Graves Nunataks (GRA) 98098, and Dhofar 700. In addition, to verify the homogeneity of (epsilon)54Cr observed for normal HEDs thus far, a set of seven eucrites and diogenites considered normal samples were also investigated. |
| NASA分類 | Lunar and Planetary Science and Exploration |
| レポートNO | JSC-CN-35242 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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