| タイトル | Spectroscopic Characterization of Mineralogy Across Vesta: Evidence of Different Lithologies |
| 本文（外部サイト） | http://hdl.handle.net/2060/20120008538 |
| 著者（英） | Filacchione, G.; Fonte, S.; Palomba, E.; Pieters, C. M.; Carraro, F.; Zambon, F.; McCord, T. B.; Magni, G.; McSween, H. Y.; Frigeri, A.; Ammannito, E.; Jaumann, R.; Capria, M. T.; De Sanotis, M. C.; Turrini, D.; McFadden, L. A.; Tosi, F.; Capaccioni, F.; Nathues, A.; Marchi, S.; Mittlefehldt, D. W.; Raymond, C. A.; Russell, C. T. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2012-01-01 |
| 言語 | eng |
| 内容記述 | The average spectrum of Vesta, obtained by VIR in the range 0.25-5.1 microns, shows clear evidence of absorption bands due to pyroxenes and thermal emissions beyond 3.5 11m. Vesta shows considerable variability across its surface in terms of spectral reflectance and emission, band depths, bands widths and bands centers, reflecting a complex geological history. Vesta's average spectrum and inferred mineralogy resemble those of howardite meteorites. On a regional scale, significant deviations are seen: the south polar 500km Rheasilvia impact crater has a higher diogenitic component, and equatorial regions show a higher eucritic component. This lithologic distribution, with a concentration of Mg-pyroxenes in the Rheasilvia area, reinforces the hypothesis of a deeper diogenitic crust excavated by the impact that formed the Rheasilvia crater, and an upper eucritic crust, whose remnants are seen in the equatorial region. This scenario has implications for Vesta differentiation, consistent with magma ocean models. However, serial magmatism models could also have concentrated pyroxene cumulates in plutons emplaced within the lower crust, |
| NASA分類 | Geophysics |
| レポートNO | GSFC.JA.5909.2012 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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