Computer Science
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981gecoa..45..727p&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 45, May 1981, p. 727-729, 731-741, 743-752. Research supported by the Centre National de
Computer Science
33
Abundance, Chemical Composition, Chondrites, Meteoritic Composition, Mineralogy, Radiation Effects, Electron Microscopy, Meteoritic Microstructures, Minerals, Neutron Activation Analysis, Petrology, Rare Gases, Trace Elements, X Ray Analysis, H Chondrites, Minor Elements, Trace Elements, Rare Earth Elements, Data, Siderophile Elements, Refractory Elements, Cosmic Ray Tracks, Analysis, Fission Tracks, Plutonium, Cooling Rate, Patterns, Photomicrographs, Neutron Activation Analysis, Antarctic Meteorites, Alla
Scientific paper
The mineralogy, chemical composition and radiation exposure history of the Acapulco meteorite, an object with a chondritic composition but achondritic texture which fell in August, 1976, are investigated. Sections of the meteorite were examined by optical and scanning electron microscopy and analyzed by electron microprobe and X-ray energy dispersive analysis; bulk samples were analyzed to yield concentrations of 50 elements, as well as light and heavy rare gas components and cosmic ray and fission track densities. A high degree of recrystallization and the mineral composition indicate meteorite formation under redox conditions intermediate between those of H and E chondrites at 1100 C, with cooling at a rate greater than 10 C/million years. The major element composition is within the range of H chondrites, however depletions in chalcophile elements and enrichments in Cr, P, U, light rare earth elements, volatile elements, planetary noble gases, and refractory siderophile are found. An old K-Ar age (4.7 billion years) and high Pu-244 track densities suggest that Acapulco may represent a rock formed in the early stages of melting of a chondritic parent body. Oxygen isotope and chemical data are then used to distinguish three groups of such reduced chondritic meteorites, comprising: (1) Acapulco, Lodran and Allan Hills A 77081; (2) Pontlyfini, Mount Morris, Winona and silicate inclusions in IAB meteorites; and (3) Kakangari.
Lorin Jean-Claude
Michel-Levy Christophe M.
Palme Herbert
Schultz Ludolf
Spettel Bernhard
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