Computer Science
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt.........6e&link_type=abstract
PhD Dissertation, Arizona State Univ. Tempe, AZ United States
Computer Science
Chondrule, Chondrites, Meteoritic Composition, Inclusions, Minerals, Radiant Heating, Solar Radiation, Electromagnetic Radiation, Meteoritic Microstructures, Computerized Simulation, Solar Corona, Particle Size Distribution
Scientific paper
Some opaque mineral within chondritic meteorites exhibit unique, fluffy textures that are distinct from the compact spheroidal blebs characteristic of formation from immiscible melts. These 'fluffy opaque inclusions' (FOI's) are approximately 10 to 100 microns in diameter and consist of numerous individual or interconnecting (less than 10 microns) inclusions of metal, magnetite, and sulfides within a matrix of Fe-rich olivine. Similar opaque-mineral textures were produced experimentally by heating compact opaque inclusions of troilite, pentlandite, and taenite hosted within silicates with 0.488 and 0.514 microns radiation from a 10-watt, argon-ion laser. The similarities between the fluffy opaque-mineral textures within chondrules and those produced experimentally suggest that electromagnetic (EM) radiation may have been an important energy source in chondrule formation. Computer simulations provide additional evidence for the role of electromagnetic (EM) radiation in the formation of chondrules. The radiative heat transfer properties of chondrules over the wavelength interval 80 nm less than or equal to lambda less than 100 micron were considered. Results indicate that in addition to the total radiative flux, peak chondrule temperatures are strongly dependent on both chondrule size and on the frequency of the incident radiation. Chondrule formation by light at wavelengths in the visible and near infrared (IR) provides explanations for: (1) the size distributions of chondrules, (2) the correlation between mean chondrule size and the proportion of nonporphyrite chondrules, and (3) the formation of coarse-grained chondrule rims. The dust-aggregate size distributions required to produce observed chondrule distributions by radiative heating are in general agreement with those predicted by nebular models of dust agglomeration. Nebular lightning and magnetic reconnection flares are possible transient heating processes capable of producing abundant EM radiation for chondrule formation.
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