The Puerto Lápice eucrite |
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| Authors: | Jordi LLORCA Ignasi CASANOVA Josep M TRIGO‐RODRÍGUEZ José M MADIEDO Julia ROSZJAR Addi BISCHOFF Ulrich OTT Ian A FRANCHI Richard C GREENWOOD Matthias LAUBENSTEIN |
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| Institution: | 1. Institut de Tècniques Energètiques, Universitat Politècnica de Catalunya, Diagonal 647, ed. ETSEIB, 08028 Barcelona, Spain;2. Centre for Research in Nanoengineering, Universitat Politècnica de Catalunya, Campus Nord B1‐109C, 08034 Barcelona, Spain;3. Institute of Space Sciences (CSIC) and Institut d'Estudis Espacials de Catalunya (IEEC), Campus UAB, Facultat de Ciències C‐5p 2a planta, 08193 Bellaterra, Spain;4. Facultad de Ciencias Experimentales, Universidad de Huelva, 21071 Huelva, Spain;5. Institut für Planetologie, Universit?t Münster, Wilhelm‐Klemm‐Str. 10, 48149 Münster, Germany;6. Max Planck Institut für Chemie, Becherweg 27, 55128 Mainz, Germany;7. Planetary and Space Sciences Research Institute, The Open University, Milton Keynes, MK7 6AA, UK;8. Laboratori Nazionali del Gran Sasso (I.N.F.N.), S.S. 17/bis km 18+910, 67010 Assergi (AQ), Italy |
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| Abstract: | Abstract— Puerto Lápice is a new eucrite fall (Castilla‐La Mancha, Spain, 10 May 2007). In this paper, we report its detailed petrography, magnetic characterization, mineral and bulk chemistry, oxygen and noble gas isotope systematics, and radionuclide data. Study of four thin sections from two different specimens reveal that the meteorite is brecciated in nature, and it contains basaltic and granulitic clasts, as well as recrystallized impact melt and breccia fragments. Shock veins are ubiquitous and show evidence of at least three different shock events. Bulk chemical analyses suggest that Puerto Lápice belongs to the main group of basaltic eucrites, although it has a significantly higher Cr content. Oxygen isotopes also confirm that the meteorite is a normal member of the HED suite. Noble gas abundances show typical patterns, with dominant cosmogenic and radiogenic contributions, and indicate an average exposure age of 19 ± 2 Ma, and a Pu‐fission Xe age well within typical eucrite values. Cosmogenic radionuclides suggest a preatmospheric size of about 20–30 cm in diameter. |
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