On the use of a nuclear microprobe for trace element analysis in meteorites and cosmic dust

Vis, R.D.; Stap, C. C. A. H. van der; Heymann, D.

doi:10.1016/0168-583x(87)90363-6

Cited by 10 publications

(2 citation statements)

References 11 publications

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“…This occurrence is considered unique for this type of lOP and therefore, supports asteroidal aqueous alteration. Secondly, trace element abundances in chondritic lOPs (Sutton and Flynn, 1988;Vis et al, 1987;Wallenwein et al, 1989) indicate 'non-chondritic,' that is elemental abundances in excess of those in CI carbonaceous chondrites, trends for minor elements as a function of their volatility in chondritic lOPs. However, these chemical analyses can not provide information on the identity of minor element carriers.…”

Section: Introductionsupporting

confidence: 84%

Salts in two chondritic porous interplanetary dust particles

Rietmeijer

1990

Meteoritics

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Abstract— Grain‐by‐grain analytical electron microscope analyses of two micrometeorites, or interplanetary dust particles (IDPs), of the chondritic porous subtype, show the presence of rare barite (BaSO4) and magnesium carbonate, probably magnesite. Salt minerals in chondritic porous (CP) IDPs give evidence for in situ aqueous alteration in their parent bodies. The uniquely high barium content of CP IDP W7029*C1 is consistent with barite precipitation from a mildly acidic (pH > ∼5) aqueous fluid at temperatures below 417 K and low oxygen fugacity. The presence of magnesite in olivine‐rich, anhydrous CP IDP W7010*A2 is evidence that carbonate minerals occur in both the chondritic porous and chondritic smooth subtypes of chondritic IDPs. Citing Schramm et al. (1989) for putative asteroidal‐type aqueous alteration in IDPs and probable sources of chondritic IDPs, salt minerals in CP IDPs could support low‐temperature aqueous activity in nuclei of active short‐period comets.

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Section: Introductionsupporting

confidence: 84%

Salts in two chondritic porous interplanetary dust particles

Rietmeijer

1990

Meteoritics

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“…Relatively high concentrations of Br in the stratosphere noted by Vis et al [45] are consistent with our data. High concentrations of Br have also been measured in IDP's with enrichments of 8 to 37 relative to C1 meteorites [46].…”

Section: Particle Concentrationssupporting

confidence: 94%

Collection of microparticles at high balloon altitudes in the stratosphere

Testa

Stephens

Berg

et al. 1990

Earth and Planetary Science Letters

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We report the collection of stratospheric particles at 34-36 km using balloon-borne collectors. The concentration of particles on the collection surfaces and element concentrations were measured on the majority of the particles using scanning electron microscope (SEM) and proton-induced X-ray emission (PIXE) analysis respectively. Particle morphologies, elemental composition, and electron diffraction data were obtained on a small number of the collected particles using transmission electron microscope (TEM) techniques. The concentration of particles between 0.045 (lower imaging limit) and 1/tin in radius is several orders of magnitude above the blank levels on the collection surfaces while the concentration of particles above 1 #m is near blank levels. More than 106 submicron particles were collected. The concentration of submicron particles is between 10 and 50 times the concentration expected at the sampling altitude based on models using the measured flux of extraterrestrial particles to the atmosphere. The higher concentration of submicron particles may be due to contributions from volcanic particles, inaccuracies in the influx of particles of this size to the earth, or breakup of larger particles. Analysis of the elemental composition using PIXE showed C1, S, Ti, Fe, Br, Ni, Zr, Zn, Sr, and Cu in decreasing order of concentration. Elements below S could not be detected in the analysis. C1, S, and Br are believed to be present due to reaction of the collection surfaces and particles with atmospheric gases while the other elements are present in the particles. The elemental composition of the particles does not aUow an unequivocal origin to be assigned because particles from several of the possible sources listed above contain the measured elements. TEM analysis of 23 of the submicron particles showed 16 to be non-graphitic. The particles ranged from A1 rich silicates to almost pure Fe to one containing almost exclusively Ba and S. None were definitely chondritic in composition. This collection of particles complements existing collections obtained by aircraft. They were collected at much higher altitude and are predominantly submicron in size. Collection and analysis of particles at high altitudes using balloons presents unique challenges and opportunities in understanding the particle population in the stratosphere.

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Particle Induced X-Ray Emission: Basic Principles, Instrumentation and Interdisciplinary Applications

Koltay

1988

X-Ray Spectroscopy in Atomic and Solid State Physics

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On the use of a nuclear microprobe for trace element analysis in meteorites and cosmic dust

Cited by 10 publications

References 11 publications

Salts in two chondritic porous interplanetary dust particles

Salts in two chondritic porous interplanetary dust particles

Collection of microparticles at high balloon altitudes in the stratosphere

Particle Induced X-Ray Emission: Basic Principles, Instrumentation and Interdisciplinary Applications

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