Analysis of chondritic interplanetary dust thin-sections

Journal Article · Fri Apr 01 04:00:00 EST 1988 · Geochimica et Cosmochimica Acta; (USA)

DOI:https://doi.org/10.1016/0016-7037(88)90359-6· OSTI ID:5181165

Bradley, J P ^[1]

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1. McCrone Associates, Inc., Westmont, IL (USA)

Chondritic interplanetary dust particles (IDPs) are heterogeneous aggregates of predominantly submicrometer mineral grains and carbonaceous material, whose bulk compositions agree within a factor of two with type CI/CM carbonaceous chondrites. The mineralogy and petrography of 25 such particles were studied by analytical electron microscopic examination of ultramicrotomed thin-sections (500-1,000 {angstrom} thick). Four classes of chondritic IDPs were recognized, referred to as pyroxene, olivine, smectite, and serpentine, and their relative abundances were 9:4:10:2 respectively. Pyroxene and olivine particles are porous assemblages of anhydrous mineral grains, glass, and carbonaceous material. Smectite and serpentine particles are low porosity objects whose matrices contain layer silicates and glassy material. Quantitative thin-film analyses indicate that pyroxene particles most closely resemble material emitted from comet Halley. Smectite particles may have formed from pyroxene particles by aqueous alteration of glass and enstatite crystals. Serpentine particles are the only class that are similar to the matrices of carbonaceous chondrites, but these are the least abundant chondritic IDPs. Collectively, chondritic particles are a mineralogically diverse group of extraterrestrial materials.

• OSTI ID: 5181165
• Journal Information: Geochimica et Cosmochimica Acta; (USA), Journal Name: Geochimica et Cosmochimica Acta; (USA) Vol. 52:4; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
CARBONACEOUS MATERIALS
CHEMICAL COMPOSITION
CHEMISTRY
CHONDRITES
CLAYS
COSMIC DUST
DUSTS
GEOCHEMISTRY
IRON COMPOUNDS
IRON SILICATES
MAGNESIUM COMPOUNDS
MAGNESIUM SILICATES
MATERIALS
METEORITES
MINERALOGY
MINERALS
OLIVINE
OXYGEN COMPOUNDS
PETROGRAPHY
PYROXENES
SERPENTINE
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SMECTITE
STONE METEORITES
TRANSITION ELEMENT COMPOUNDS