Mineralogy of HED Meteorites Using the Modified Gaussian Model

被引：0

作者：

Lina Canas

René Duffard

Teresa Seixas

机构：

[1] Faculdade de Ciências da Universidade do Porto,

[2] Instituto Astrofisica de Andalucia,undefined

来源：

Earth, Moon, and Planets | 2008年 / 102卷

关键词：

Vesta; HEDs; Meteorites; Asteroids; Modified Gaussian Model;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The correlation between specific meteorites and asteroids is a long-standing problem. The best-known correlation seems to be the HED–Vesta, although several problems still remain to be solved. We report the spectral reflectance analysis (0.4–2.5 μm) of a set of HED meteorites, taken from the RELAB database and three V-type asteroids, taken from MIT-UH-IRTF Joint Campaign for NEO Reconnaissance. We used the Modified Gaussian Model to fit the spectra to a series of overlapping, modified Gaussian absorptions. The fitted individual bands are validated against established laboratory calibrations. With spectral resolution extending to the near-infrared, we are able to resolve the presence of both high-calcium pyroxene (HCP) and low-calcium pyroxene (LCP) and, thus, use the HCP/(HCP + LCP) ratios to remotely trace igneous processing on the parent asteroids. A search of this mineral provides a useful probe of differentiation. The high HCP/(HCP + LCP) ratios found require extensive differentiation of these asteroids and/or their primordial parent body. The degree of melting obtained for the eucrites, using the former ratio, is comparable with that obtained for all V-type asteroids here analyzed, suggesting a comparable geologic history.

引用

页码：543 / 548

页数：5

共 28 条

[1]

Adams J.B.(1974)Visible and near-infrared diffuse reflectance spectra of pyroxenes as applied to remeote sensing of solid objects in the solar system J. Geophys. Res. 79 4829-4836

[2]

Asimov P.D.(1998)Algorithmic modifications extending MELTS to calculate sub-solidus phase relations Am. Mineral. 83 1127-1282

[3]

Ghiroso M.S.(1977)Composition and evolution of the eucrite parent body—evidence from rare earth elements Geochim. Cosmochim. Acta 41 1271-132

[4]

Consolmagno Drake G.J. M.J.(2004)Mineralogical characterization of some basaltic asteroids in the neighborhood of (4) Vesta: first results Icarus. 171 120-1447

[5]

Duffard R.(1995)Chemical mass transfer in magmatic processes IV. A revised and internally consistent thermodynamic model for the interpolation and extrapolation of liquid-solid equilibria in magmatic systems at elevated temperatures and pressures Contrib. Mineral. Petr. 119 197-497

[6]

Lazzaro D.(1970)Asteroid Vesta: spectral reflectivity and compositional implications Science. 168 1445-6966

[7]

Licandro J.(1994)Meteorite and Asteroid reflectance spectroscopy: clues to early solar system processes Ann. Rev. Earth Planet. Sci. 22 457-9087

[8]

De Sanctis M.C.(1990)Deconvolution of mineral absorption bands: an improved approach J. Geophys. Res. 95 6955-1357

[9]

Capria M.T.(1993)Estimating modal abundances from the spectra of natural and laboratory pyroxene mixtures using the modified Gaussian model J. Geophys. Res. 98 9075-undefined

[10]

Carvano J.M.(2004)High-calcium pyroxene as an indicator of igneous differentiation in asteroids and meteorites Meteoritics & Planet. Sci. 39 1343-undefined

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