The Ardón L6 ordinary chondrite : a long-hidden Spanish meteorite fall

Autor: Trigo Rodríguez, Josep María, Llorca, Jordi, Weyrauch, Mona, Bischoff, Addi, Moyano Cambero, Carles E., Keil, Klaus, Laubenstein, Matthias, Pack, Andreas, Madiedo Gil, José María|||0000-0003-0806-5194, Alonso Azcárate, Jacinto, Riebe, My, Wieler, Rainer, Ott, Uli, Tapia, Mar, Mestres, Narcís
Jazyk: angličtina
Rok vydání: 2014
Zdroj: Meteoritics & Planetary Science
Arias Montano. Repositorio Institucional de la Universidad de Huelva
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Popis: We report and describe an L6 ordinary chondrite fall that occurred in Ardon Leon province Spain (longitude 5.5605 degrees W latitude 42.4364 degrees N) on July 9th 1931. The 5.5 g single stone was kept hidden for 83 yr by Rosa Gonzalez Perez at the time an 11 yr old who had observed the fall and had recovered the meteorite. According to various newspaper reports the event was widely observed in Northern Spain. Ardon is a very well preserved fresh strongly metamorphosed (petrologic type 6) and weakly shocked (S3) ordinary chondrite with well equilibrated and recrystallized minerals. The mineral compositions (olivine Fa(23.7 +/ 0.3) low Ca pyroxene Fs(20.4 +/ 0.2)Wo(1.5 +/ 0.2) plagioclase An(10.3 +/ 0.5)Ab(84.3 +/ 1.2)) magnetic susceptibility (log chi = 4.95 +/ 0.05 x10( 9) m(3) kg( 1)) bulk density (3.49 +/ 0.05 g cm( 3)) grain density (3.58 +/ 0.05 g cm( 3)) and porosity (2.5 vol) are typical for L6 chondrites. Short lived radionuclides confirm that the meteorite constitutes a recent fall. The Ne 21 and Ar 38 cosmic ray exposure ages are both about 20 30 Ma similar to values for many other L chondrites. The cosmogenic Ne 22/Ne 21 ratio indicates that preatmospheric Ardon was a relatively large body. The fact that the meteorite was hidden in private hands for 83 yr makes one wonder if other meteorite falls may have experienced the same fate thus possibly explaining the anomalously low number of falls reported in continental Spain in the 20th century.
Databáze: OpenAIRE
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