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The Villalbeto de la Peña meteorite fall: III. Bulk chemistry, porosity, magnetic properties, 57 Fe Mössbauer spectroscopy, and Raman spectroscopy
Author(s) -
Llorca Jordi,
Gich Martí,
Molins Elies
Publication year - 2007
Publication title -
meteoritics and planetary science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.09
H-Index - 100
eISSN - 1945-5100
pISSN - 1086-9379
DOI - 10.1111/j.1945-5100.2007.tb00603.x
Subject(s) - kamacite , chondrite , meteorite , olivine , mössbauer spectroscopy , raman spectroscopy , analytical chemistry (journal) , mineralogy , porosity , geology , chemistry , crystallography , astrobiology , physics , optics , chromatography , geotechnical engineering
— Detailed mineralogical and chemical studies and measurements of the magnetic properties and porosity of the Villalbeto de la Peña (L6) chondrite are reported. The measured abundances of 36 chemical elements are within the range observed for L6 chondrites for most elements, except for Pd and Os, which are particularly abundant in Villalbeto de la Peña. The specific magnetic susceptibility of the meteorite is 4.85 ± 0.05 (in 10 −9 m 3 kg −1 ) and the porosity is 4.7%. The J RS /J S (1.2 ± 0.2 × 10 −3 ) and H C (3.3 × 10 −4 T) values recorded are among the lowest ever reported for a chondrite. 57 Fe Mössbauer spectroscopy of the whole rock indicates that the meteorite faced oxidizing conditions prior to fall. The Mössbauer spectrum of the metal fraction shows the presence of the only ferromagnetic phases kamacite and taenite. No tetrataenite is present, which is in total accordance to magnetic studies. Raman spectra yield compositional values for olivine (χMg ∼0.76), orthopyroxene (χMg ∼0.79), and clinopyroxene (χMg ∼0.49). Raman spectra of phosphate in shock veins indicates that Villalbeto de la Peña was not severely shock‐metamorphosed.