Ion irradiation of Allende meteorite probed by visible, IR, and Raman spectroscopies

Brunetto, R.; Lantz, C.; Ledu, D.; Baklouti, D.; Barucci, Maria Antonietta; Beck, Pierre; Delauche, L.; Dionnet, Z.; Dumas, Paul; Duprat, J.; Engrand, C.; Jamme, Frédéric; Oudayer, P.; Quirico, E.; Sandt, Christophe; Dartois, E.

doi:10.1016/j.icarus.2014.04.047

Cited by 70 publications

(94 citation statements)

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“…Predictions for these bodies suggested a possible limited effect on the spectral slope (Pieters et al 2000), or even an opposite effect defined as blueing of the slope (Nesvorný et al 2005). Contradictory results have also been obtained in laboratory SpWe ion irradiation experiments performed on primitive materials: spectral reddening on Allende (Lazzarin et al 2006;Brunetto et al 2014) and Frontier Mountain 95002 (Lazzarin et al 2006), and blueing on asphaltite (Moroz et al 2004a) and Tagish Lake meteorite (Vernazza et al 2013) have been observed. Tagish Lake also shows a significant spectral flattening after pulse laser irradiation Article published by EDP Sciences A41, page 1 of 9 (Hiroi et al 2013).…”

Section: Introductionmentioning

confidence: 60%

“…Ion irradiation of the pellets was performed on the SIDONIE platform (CSNSM, Orsay) with He + and Ar + at 40 keV. The following fluences were used (several spots allowed on one pellet, plus a central area left virgin): 1 × 10 16 and 3 × 10 16 ions/cm 2 for He + , and 2 × 10 15 and 6 × 10 15 ions/cm 2 for Ar + (see Brunetto et al 2014 for details on the experimental setup and technique). We chose to prepare pellets because in our experimental setup samples are held vertically.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Raman micro-spectroscopy was also performed at the SMIS beamline at SOLEIL using a 532 nm exciting laser radiation, and a power on the sample lower than 0.3 mW. We used a spectral resolution of 4 cm −1 and a spatial resolution of about 1 µm, and we probed matrix areas (see Brunetto et al 2014 for more details). In all spectral ranges, several spectra were acquired to account for the sample heterogeneity.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…Testing several classes of CCs will give us a larger view of SpWe influence on the primitive dark asteroids. In a previous paper (Brunetto et al 2014) we studied ion irradiation of CV Allende meteorite. Here we focus on the CM2 Murchison chondrite because of the well established link between the CM meteorites and the C-class asteroids (see, e.g., Burbine et al 2002).…”

Section: Introductionmentioning

confidence: 99%

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Ion irradiation of the Murchison meteorite: Visible to mid-infrared spectroscopic results

Lantz

Brunetto

Barucci

et al. 2015

A&A

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Aims. The goal of this study is to simulate space weathering processes on primitive bodies. We use ion implantation as a simulation of solar wind irradiation, which has been suggested by several authors to be the major component of space weathering on main belt asteroids. The laboratory analogs we irradiate and analyze are carbonaceous chondrites; we started the study with the Allende CV meteorite and in this companion paper we present results on the Murchison CM meteorite. Methods. We performed irradiations on pressed pellets of Murchison with 40 keV He+ and Ar + ions using fluences up to 3 × 10 16 ions/cm 2 . Reflectance spectra were acquired ex situ before and after irradiation in the visible to mid-infrared range (0.4-16 µm). A Raman analysis was also performed to investigate the modifications of the aromatic carbonaceous component. Results. Our results indicate that spectral variations after irradiation within the visible range are smaller than spectral variations due to sample grain size or viewing geometry of the Murchison meteorite. The aqueous alteration band profile near 3 µm changes after irradiation, as adsorbed water is removed, and phyllosilicates are affected. Raman spectroscopy highlights the insoluble organic matter (IOM) modification under irradiation. We observe a shift of the silicates band at 9.9 µm, probably due to a preferential loss of Mg (compared to Fe, the lighter Mg is more easily sputtered backward) and/or amorphization of Mg-rich materials. We compare our results to previous experiments on organic-rich materials (like asphaltite or carbonaceous chondrites), and on ordinary chondrites and olivine grains. We find that the reddening/darkening trend observed on silicate-rich surfaces is not valid for all carbonaceous chondrites, and that the spectral modifications after irradiation are a function of the initial albedo.

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Section: Introductionmentioning

confidence: 60%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Ion irradiation of the Murchison meteorite: Visible to mid-infrared spectroscopic results

Lantz

Brunetto

Barucci

et al. 2015

A&A

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“…Laboratory simulations indicate that solar wind may alter the surfaces in a relatively short timescale, of the order of 10 3 -10 5 years, producing darkening and reddening effects on ordinary chondrites ), on S-type asteroids (Vernazza et al 2009a(Vernazza et al , 2009b, and on the Allende carbonaceous chondrite (Brunetto et al 2014). This has also been confirmed by the Itokawa grain analysis brought back to the Earth by the sample return mission…”

Section: Scenario C): the Family Parent Body Was Homogeneous And The mentioning

confidence: 99%

Spectral variability on primitive asteroids of the Themis and Beagle families: Space weathering effects or parent body heterogeneity?

Fornasier

Lantz

Perna

et al. 2016

Icarus

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Themis is an old and statistically robust asteroid family populating the outer main belt, and resulting from a catastrophic collision that took place 2.5±1.0 Gyr ago. Within the old Themis family a young sub-family, Beagle, formed less than 10 Myr ago, has been identified. We present the results of a spectroscopic survey in the visible and near infrared range of 22 Themis and 8 Beagle families members. The Themis members investigated exhibit a wide range of spectral behaviors, including asteroids with blue/neutral and moderately red spectra, while the younger Beagle family members look spectrally bluer than the Themis ones and they have a much smaller spectral slope variability. Four Themis members, including (24) Themis, have absorption bands centered at 0.68-0.73 µm indicating the presence of aqueously altered minerals. The best meteorite spectral analogues found for both Themis and Beagle families members are carbonaceous chondrites having experienced different degrees of aqueous alteration, prevalently CM2 but also CV3 and CI, and some of them are chondrite samples being unusual or heated. The presence of aqueous altered materials on the asteroids surfaces and the meteorite matches indicate that the parent body of the Themis family experienced mild thermal metamorphism in the past. We extended the spectral analysis including the data available in the literature on Themis and Beagle families members, and we looked for correlations between spectral behavior and physical parameters using the albedo and size values derived from the WISE data. The analysis of this larger sample confirm the spectral diversity within the Themis family and that Beagle members tend to be bluer and to have an higher albedo. The differences between the two family may be partially explained by space weathering processes, which act on these primitive surfaces in a similar way than on S-type asteroids, i.e. producing reddening and darkening. However we see several Themis members having albedos and spectral slopes similar to the young Beagle members. Alternative scenarios are proposed including heterogeneity in the parent body having a compositional gradient with depth, and/or the survival of projectile fragments having a different composition than the parent body.

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Micro‐ R aman Imaging of Planetary Analogs: Nanoscale Characterization of Past and Current Processes

Bower

Jabukek

Fries

et al. 2022

Spectroscopy and Characterization of Nanomaterials and Novel Materials

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Ion irradiation of Allende meteorite probed by visible, IR, and Raman spectroscopies

Cited by 70 publications

References 82 publications

Ion irradiation of the Murchison meteorite: Visible to mid-infrared spectroscopic results

Ion irradiation of the Murchison meteorite: Visible to mid-infrared spectroscopic results

Spectral variability on primitive asteroids of the Themis and Beagle families: Space weathering effects or parent body heterogeneity?

Micro‐ R aman Imaging of Planetary Analogs: Nanoscale Characterization of Past and Current Processes

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