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Chemically Anomalous, Preaccretionally Irradiated Grains in Interplanetary Dust from Comets
Abstract
Nonstoichiometric grains with depletions of magnesium and silicon (relative to oxygen) and inclusions of iron-nickel metal and iron-rich sulfides have been identified in interplanetary dust particles from comets. These chemical anomalies accumulate in grains exposed to ionizing radiation. The grains, known as GEMS (glass with embedded metal and sulfides), were irradiated before the accretion of comets, and their inferred exposure ages, submicrometer sizes, and "amorphous" silicate structures are consistent with those of interstellar silicate grains. The measured compositional trends suggest that chemical (as well as isotopic) anomalies can be used to identify presolar interstellar components in primitive meteoritic materials.
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Cited by
Draine, B. T. (2003) · Annual Review of Astronomy and Astrophysics · doi:10.1146/annurev.astro.41.011802.094840 · Cited by 2,389
The nature and origin of rims on lunar soil grains
Keller, L. P., & McKay, D. S. (1997) · Geochimica et Cosmochimica Acta · doi:10.1016/s0016-7037(97)00085-9 · Cited by 451
STELLAR NUCLEOSYNTHESIS AND THE ISOTOPIC COMPOSITION OF PRESOLAR GRAINS FROM PRIMITIVE METEORITES
Zinner, E. (1998) · Annual Review of Earth and Planetary Sciences · doi:10.1146/annurev.earth.26.1.147 · Cited by 361
Metadata
- Authors
- Bradley, J. P.
- Venue
- Science
- Published
- 1994-08-12
- Volume
- 265
- Issue
- 5174
- Pages
- 925-929
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W1979610917
- Cited by
- 453
- References
- 0
- FWCI
- 12.78
- Type
- journal article
- Language
- en
- Open access
- closed
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- Bradley, J. P. (1994). Chemically Anomalous, Preaccretionally Irradiated Grains in Interplanetary Dust from Comets. Science. https://doi.org/10.1126/science.265.5174.925
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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