Aqueous alteration in five chondritic porous interplanetary dust particles

Details Aqueous alteration in five chondritic porous interplanetary dust particles Aqueous alteration in five chondritic porous interplanetary dust particles

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991e%26psl.102..148r&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 102, no. 2, Feb. 1991, p. 148-157.

Computer Science

19

Carbonaceous Chondrites, Interplanetary Dust, Micrometeoroids, Porous Materials, Stratosphere, Water, Amorphous Materials, Chemical Composition, Electron Diffraction, Silicates, Interplanetary Dust, Alteration, Particles, Chondritic Material, Idps, Laboratory Studies, Micrometeorites, Samples, Extraterrestrial, Aem, Electron Microscopy, Silicates, Mineralogy, Source, Parent Bodies, Plagioclase, Alkali, Feldspar, Procedure, Origin, Formation, Illite, Hypotheses, Amorphous Material, Parameters, Calcium

Scientific paper

Results are presented on AEM observations carried out on chondritic porous (CP) interplanetary dust particles (IDPs), which include data on alkali-rich layer silicates and new observations of nonstoichiometric plagioclase and alkali feldspars in individual CP IDPs. The compositional similarities found between the feldspar minerals and the layer silicates suggest that the latter have formed from these feldspars during low-temperature aqueous alterations at a stage of diagenesis in the CP IDP parent bodies. Small, but persistent, amounts of layer silicates, carbonates, and barite found in several nominally anhydrous CP IDPs support the suggestion of incipient aqueous alterations in their parent bodies, which may include short-period comet nuclei and outer-belt asteroids.

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