Spectroscopic Characterization of Mineralogy and Its Diversity Across Vesta

被引：224

作者：

De Sanctis, M. C. ^{[1
]}

Ammannito, E. ^{[1
]}

Capria, M. T. ^{[1
]}

Tosi, F. ^{[1
]}

Capaccioni, F. ^{[1
]}

Zambon, F. ^{[1
]}

Carraro, F. ^{[1
]}

Fonte, S. ^{[1
]}

Frigeri, A. ^{[1
]}

Jaumann, R. ^{[2
]}

Magni, G. ^{[1
]}

Marchi, S. ^{[3
]}

McCord, T. B. ^{[4
]}

McFadden, L. A. ^{[5
]}

McSween, H. Y. ^{[6
]}

Mittlefehldt, D. W. ^{[7
]}

Nathues, A. ^{[8
]}

Palomba, E. ^{[1
]}

Pieters, C. M. ^{[9
]}

Raymond, C. A. ^{[10
]}

Russell, C. T. ^{[11
]}

Toplis, M. J. ^{[12
]}

Turrini, D. ^{[1
]}

机构：

[1] Ist Nazl Astrofis, Ist Astrofis & Planetol Spaziali, Rome, Italy

[2] German Aerosp Ctr DLR, Inst Planetary Res, Berlin, Germany

[3] NASA, Lunar Sci Inst, Boulder, CO USA

[4] Bear Fight Inst, Winthrop, WA USA

[5] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[6] Univ Tennessee, Dept Earth & Planetary Sci, Knoxville, TN USA

[7] NASA, Lyndon B Johnson Space Ctr, Houston, TX 77058 USA

[8] Max Planck Inst Sonnensyst Forsch, D-37191 Katlenburg Lindau, Germany

[9] Brown Univ, Providence, RI 02912 USA

[10] CALTECH, Jet Prop Lab, Pasadena, CA USA

[11] Univ Calif Los Angeles, Inst Geophys & Planetary Phys, Los Angeles, CA 90024 USA

[12] Observ Midi Pyrenees, F-31400 Toulouse, France

来源：

SCIENCE | 2012年 / 336卷 / 6082期

关键词：

ASTEROID VESTA; EUCRITES; CONSTRAINTS; EVOLUTION; MODEL; DAWN;

D O I：

10.1126/science.1219270

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

The mineralogy of Vesta, based on data obtained by the Dawn spacecraft's visible and infrared spectrometer, is consistent with howardite-eucrite-diogenite meteorites. There are considerable regional and local variations across the asteroid: Spectrally distinct regions include the south-polar Rheasilvia basin, which displays a higher diogenitic component, and equatorial regions, which show a higher eucritic component. The lithologic distribution indicates a deeper diogenitic crust, exposed after excavation by the impact that formed Rheasilvia, and an upper eucritic crust. Evidence for mineralogical stratigraphic layering is observed on crater walls and in ejecta. This is broadly consistent with magma-ocean models, but spectral variability highlights local variations, which suggests that the crust can be a complex assemblage of eucritic basalts and pyroxene cumulates. Overall, Vesta mineralogy indicates a complex magmatic evolution that led to a differentiated crust and mantle.

引用

页码：697 / 700

页数：4

共 31 条

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