Pristine stratospheric collection of interplanetary dust on an oil‐free polyurethane foam substrate

Messenger, S.; Nakamura‐Messenger, K.; Keller, L. P.; Clemett, S. J.

doi:10.1111/maps.12473

Cited by 23 publications

(30 citation statements)

References 61 publications

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“…Meteorites that preserve amorphous materials formed through disequilibrium condensation include leastprocessed carbonaceous chondrites in the CO, CR and ungrouped samples (e.g., Brearley, 1993;Abreu and Brearley, 2010;Greshake, 1997), CMs Paris and Yamato-791198 where these phases are preserved during heterogeneous aqueous alteration (Leroux et al, 2015;Chizmadia and Brearley, 2008) and ordinary chondrites (e.g., Alexander et al, 1989) . Glass with Embedded Metal and Sulfide (GEMS) grains found in interplanetary dust particles are also interpreted to form through disequilibrium condensation (Keller and Messenger, 2011;Messenger et al, 2015) and it has been proposed that they were the precursors for the amorphous materials found in chondrite matrices (e.g., Chizmadia and Brearley, 2008;Le Guillou and Brearley, 2014;Leroux et al, 2015;Keller and Messenger, 2012).…”

Section: Disequilibrium Condensation Of Amorphous Silicatesmentioning

confidence: 99%

Spectral evidence for amorphous silicates in least-processed CO meteorites and their parent bodies

McAdam

Sunshine

Howard

et al. 2018

Icarus

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Least-processed carbonaceous chondrites (carbonaceous chondrites that have experienced minimal aqueous alteration and thermal metamorphism) are characterized by their predominately amorphous iron-rich silicate interchondrule matrices and chondrule rims. This material is highly susceptible to destruction by the parent body processes of thermal metamorphism or aqueous alteration. The presence of abundant amorphous material in a meteorite indicates that the parent body, or at least a region of the parent body, experienced minimal processing since the time of accretion. The CO chemical group of carbonaceous chondrites has a significant number of these least-processed samples. We present visible/nearinfrared and mid-infrared spectra of eight least-processed CO meteorites (petrologic type 3.0-3.1). In the visible/near-infrared, these COs are characterized by a broad weak feature that was first observed by Cloutis et al. (2012) to be at 1.3-µm and attributed to iron-rich amorphous silicate matrix materials. This feature is observed to be centered at 1.4-µm for terrestrially unweathered, least-processed CO meteorites. At mid-infrared wavelengths, a 21-µm feature, consistent with Si-O vibrations of amorphous materials and glasses, is also present. The spectral 2 features of iron-rich amorphous silicate matrix are absent in both the near-and mid-infrared spectra of higher metamorphic grade COs because this material has recrystallized as crystalline olivine. Furthermore, spectra of least-processed primitive meteorites from other chemical groups (CRs, MET 00426 and QUE 99177, and C2-ungrouped Acfer 094), also exhibit a 21-µm feature.Thus, we conclude that the 1.4-and 21-µm features are characteristic of primitive least-processed meteorites from all chemical groups of carbonaceous chondrites. Finally, we present an IRTF+SPeX observation of asteroid (93) Minerva that has spectral similarities in the visible/near-infrared to the least-processed CO carbonaceous chondrites. While Minerva is not the only CO-like asteroid (e.g., Burbine et al., 2001), Minerva is likely the least-processed COlike asteroid observed to date.

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Section: Disequilibrium Condensation Of Amorphous Silicatesmentioning

confidence: 99%

Spectral evidence for amorphous silicates in least-processed CO meteorites and their parent bodies

McAdam

Sunshine

Howard

et al. 2018

Icarus

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“…Keller and Messenger () and Messenger et al. () measured compositions of 287 GEMS, from which we calculated mean compositions and standard deviations for each element. We used a

χ^{2}

test to determine if objects within the FGM were consistent in their elemental composition with GEMS:

{normalχ}^{2} = \underset{normalelements}{false\sum} \frac{{false(X - {\bar{X}}_{GEMS} false)}^{2}}{σ_{normalGEMS}^{2}}

where X is the atomic fraction of an element in the particle,

{\bar{X}}_{GEMS}

and

σ_{GEMS}

are the mean and standard deviation, respectively, of the atomic elemental fractions, measured in a large number of GEMS from Keller and Messenger () and Messenger et al.…”

Section: Resultsmentioning

confidence: 99%

“…We used a

χ^{2}

test to determine if objects within the FGM were consistent in their elemental composition with GEMS:

{normalχ}^{2} = \underset{normalelements}{false\sum} \frac{{false(X - {\bar{X}}_{GEMS} false)}^{2}}{σ_{normalGEMS}^{2}}

where X is the atomic fraction of an element in the particle,

{\bar{X}}_{GEMS}

and

σ_{GEMS}

are the mean and standard deviation, respectively, of the atomic elemental fractions, measured in a large number of GEMS from Keller and Messenger () and Messenger et al. (). To compute

χ^{2}

, we used atomic fractions of eight elements and report the reduced

χ^{2}

(

χ_{ν}^{2}

, ν = 7 degrees of freedom) along with p , the probability that the composition is inconsistent with that of the GEMS distribution.…”

Section: Resultsmentioning

confidence: 99%

“…we show the compositions of all the FGMs studied in Andromeda against literature values for GEMS compositions from Messenger et al. () and EA compositions from Keller and Messenger (). The plot shows the importance of using both compositional data and petrographic data in order to classify the objects as GEMS or altered materials, since we have many objects which are compositionally consistent with GEMS in the ternary plot but are not likely to be pristine GEMS based on their morphology.…”

Section: Discussionmentioning

confidence: 99%

“… Ternary plot showing the compositions of fine‐grained materials in Andromeda compared to the GEMS field from Messenger et al. (), and EA field from Keller and Messenger (). SiO

_{2}

enrichment from aerogel mixing would push all the points toward the Si corner.…”

Section: Discussionmentioning

confidence: 99%

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Fine‐grained material associated with a large sulfide returned from Comet 81P/Wild 2

Gainsforth

Westphal

Butterworth

et al. 2019

Meteorit & Planetary Scien

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In a consortium analysis of a large particle captured from the coma of comet 81P/ Wild 2 by the Stardust spacecraft, we report the discovery of a field of fine-grained material (FGM) in contact with a large sulfide particle. The FGM was partially located in an embayment in the sulfide. As a consequence, some of the FGM appears to have been protected from damage during hypervelocity capture in aerogel. Some of the FGM particles are indistinguishable in their characteristics from common components of chondritic-porous interplanetary dust particles, including glass with embedded metals and sulfides and equilibrated aggregates. The sulfide exhibits surprising Ni-rich lamellae, which may indicate that this particle experienced a long-duration heating event after its formation but before incorporation into Wild 2.

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Advanced Curation of Astromaterials for Planetary Science

et al. 2019

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Just as geological samples from Earth record the natural history of our planet, astromaterials hold the natural history of our solar system and beyond. Astromaterials acquisition and curation practices have direct consequences on the contamination levels of astromaterials and hence the types of questions that can be answered about our solar system and the degree of precision that can be expected of those answers. Advanced curation was developed as a cross-disciplinary field to improve curation and acquisition practices in existing astromaterials collections and for future sample return activities, including meteorite and cosmic dust samples that are collected on Earth. These goals are accomplished through research and development of new innovative technologies and techniques for sample collection, handling, characterization, analysis, and curation of astromaterials. In this contribution, we discuss five broad topics in advanced curation that are critical to improving sample acquisition and curation practices, including (1) best practices for monitoring and testing of curation infrastructure for inorganic, organic, and biological contamination; (2) requirements for storage, processing, and sample handling capabilities for future sample

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Pristine stratospheric collection of interplanetary dust on an oil‐free polyurethane foam substrate

Cited by 23 publications

References 61 publications

Spectral evidence for amorphous silicates in least-processed CO meteorites and their parent bodies

Spectral evidence for amorphous silicates in least-processed CO meteorites and their parent bodies

Fine‐grained material associated with a large sulfide returned from Comet 81P/Wild 2

Advanced Curation of Astromaterials for Planetary Science

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