Chemical fractionation effects during high velocity impact

Lange, G.; Aigner, Sandra; Igenbergs, E.; Jeßberger, E. K.; Kuczera, H.; Maas, D.; Sutton, S. R.; Weishaupt, U.; Zinner, E.

doi:10.1016/0273-1177(86)90203-6

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…Table 2 summarizes the atomic abundances normalized to Si of the seven analyzed crater residues. In contrast to investigations of highvelocity impact crater residues from the LDEF experiment, where element fractionation clearly occurred (Lange et al 1986), no such effect was unambiguously observed.…”

Section: Bulk Element Compositionmentioning

confidence: 52%

TOF‐SIMS analysis of crater residues from Wild 2 cometary particles on Stardust aluminum foil

Leitner

Stephan

Kearsley

et al. 2008

Meteorit & Planetary Scien

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TOF-SIMS analysis of crater residues fromAbstract-Impact residues of cometary particles on aluminum foils from the Stardust mission were investigated with TOF-SIMS for their elemental and organic composition. The residual matter from comet 81P/Wild 2 shows a wide compositional range, from nearly monomineralic grains to polymict aggregates. Despite the comparably small analyzed sample volume, the average element composition of the investigated residues is similar to bulk CI chondritic values. Analysis of organic components in impact residues is complicated, due to fragmentation and alteration of the compounds during the impact process and by the presence of contaminants on the aluminum foils. Nevertheless, polycyclic aromatic hydrocarbons (PAHs) that are unambiguously associated with the impact residues were observed, and thus are most likely of cometary origin.

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Section: Bulk Element Compositionmentioning

confidence: 52%

TOF‐SIMS analysis of crater residues from Wild 2 cometary particles on Stardust aluminum foil

Leitner

Stephan

Kearsley

et al. 2008

Meteorit & Planetary Scien

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“…In their pioneering study, Lange et al (1986) used SIMS to demonstrate strong spatial elemental fractionation in vapor deposits on foils suspended above impact targets. The results from experimental shots at velocities similar to the Stardust encounter highlight the necessity of sampling bulk (micronscale) residue, rather than thin films redeposited from vapor, if reliable analysis of volatile elements is required.…”

Section: Elemental Fractionation In Impact Residuesmentioning

confidence: 99%

“…This is still sufficient to melt most silicate minerals (Stöffler et al, 1988), although the presence of solid remnants in many of our experimental craters suggests that stress decays rapidly and strain is distributed inhomogeneously within the projectile, due to irregular particle shape and internal structure giving interference from complex free surfaces. However, the potential for elemental fractionation from high temperature melts into vacuum is obvious from the range in evaporation temperature data tabulated by Lodders (2001), with sodium and sulfur largely in the vapour state at temperatures of 900 o C. In their pioneering study, Lange et al (1986) used SIMS to demonstrate strong spatial elemental fractionation in vapour deposits on foils suspended above impact targets. Their results, from experimental shots at velocities similar to the Stardust encounter, highlight the necessity of sampling bulk (micron scale) residue, rather than thin films re-deposited from vapour, if reliable analysis of volatile elements is required.…”

Section: Elemental Fractionation In Impact Residuesmentioning

confidence: 99%

“…However, the potential for elemental fractionation from high temperature melts into vacuum is obvious from the range in evaporation temperature data tabulated by Lodders (2001), with sodium and sulfur largely in the vapor state at temperatures of 900 °C. In their pioneering study, Lange et al (1986) used SIMS to demonstrate strong spatial elemental fractionation in vapor deposits on foils suspended above impact targets. The results from experimental shots at velocities similar to the Stardust encounter highlight the necessity of sampling bulk (micronscale) residue, rather than thin films redeposited from vapor, if reliable analysis of volatile elements is required.…”

Section: Elemental Fractionation In Impact Residuesmentioning

confidence: 99%

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Analytical scanning and transmission electron microscopy of laboratory impacts on Stardust aluminum foils: Interpreting impact crater morphology and the composition of impact residues

Kearsley¹,

Graham²,

Burchell³

et al. 2007

Meteorit & Planetary Scien

113

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Abstract-The known encounter velocity (6.1 kms −1 ) and particle incidence angle (perpendicular) between the Stardust spacecraft and the dust emanating from the nucleus of comet Wild-2 fall within a range that allows simulation in laboratory light-gas gun (LGG) experiments designed to validate analytical methods for the interpretation of dust impacts on the aluminum foil components of the Stardust collector. Buckshot of a wide size, shape, and density range of mineral, glass, polymer, and metal grains, have been fired to impact perpendicularly on samples of Stardust Al 1100 foil, tightly wrapped onto aluminum alloy plate as an analogue of foil on the spacecraft collector. We have not yet been able to produce laboratory impacts by projectiles with weak and porous aggregate structure, as may occur in some cometary dust grains. In this report we present information on crater gross morphology and its dependence on particle size and density, the pre-existing major-and trace-element composition of the foil, geometrical issues for energy dispersive X-ray analysis of the impact residues in scanning electron microscopes, and the modification of dust chemical composition during creation of impact craters as revealed by analytical transmission electron microscopy. Together, these observations help to underpin the interpretation of size, density, and composition for particles impacted on the Stardust aluminum foils.

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