Maribo—A new CM fall from Denmark |
| |
| Authors: | Henning HAACK Thomas GRAU Addi BISCHOFF Marian HORSTMANN John WASSON Anton SØRENSEN Matthias LAUBENSTEIN Ulrich OTT Herbert PALME Marko GELLISSEN Richard C GREENWOOD Victoria K PEARSON Ian A FRANCHI Zelimir GABELICA Philippe SCHMITT‐KOPPLIN |
| |
| Institution: | 1. Centre for Star and Planet Formation, Natural History Museum of Denmark, University of Copenhagen, ?ster Voldgade 5‐7, Copenhagen K, Denmark;2. European Research Center for Fireballs and Meteorites, Puschkinstr. 23, 16321 Bernau bei Berlin, Germany;3. Institut für Planetologie, University of Münster, Wilhelm‐Klemm‐Str. 10, 48149 Münster, Germany;4. UCLA, Institute of Geophysics & Planetary Physics, 3845 Slichter Hall, 603 Charles E. Young Drive East, Los Angeles, California 90095–1567, USA;5. The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen ?, Denmark;6. Laboratori Nazionali del Gran Sasso––I.N.F.N., S.S. 17 bis, km. 18+910, I‐67010 Assergi (AQ), Italy;7. Max‐Planck‐Institut für Chemie, Joh.‐Joachim‐Becher‐Weg 2755128 Mainz, Germany and University of Western Hungary, Szombathely, Hungary;8. Forschungsinstitut und Naturmuseum Senckenberg, Senckenberganlage 25, 60325 Frankfurt, Germany;9. Institut für Geologie und Mineralogie, Universit?t zu K?ln, Zülpicher Stra?e 49 a + b, 50674 K?ln, Germany;10. Department of Physical Sciences, Open University, Walton Hall, Milton Keynes MK7 6AA, UK;11. Université de Haute Alsace, ENSCMu, Lab. GSEC, 3, Rue A. Werner, F‐68093 Mulhouse Cedex, France;12. Helmholtz Zentrum München, BioGeoChemistry and Analytics, Ingolstaedter Landstrasse 1, 85764 Neuherberg, Germany |
| |
| Abstract: | Abstract– Maribo is a new Danish CM chondrite, which fell on January 17, 2009, at 19:08:28 CET. The fall was observed by many eye witnesses and recorded by a surveillance camera, an all sky camera, a few seismic stations, and by meteor radar observatories in Germany. A single fragment of Maribo with a dry weight of 25.8 g was found on March 4, 2009. The coarse‐grained components in Maribo include chondrules, fine‐grained olivine aggregates, large isolated lithic clasts, metals, and mineral fragments (often olivine), and rare Ca,Al‐rich inclusions. The components are typically rimmed by fine‐grained dust mantles. The matrix includes abundant dust rimmed fragments of tochilinite with a layered, fishbone‐like texture, tochilinite–cronstedtite intergrowths, sulfides, metals, and carbonates often intergrown with tochilinite. The oxygen isotopic composition: (δ17O = ?1.27‰; δ18O = 4.96‰; Δ17O = ?3.85‰) plots at the edge of the CM field, close to the CCAM line. The very low Δ17O and the presence of unaltered components suggest that Maribo is among the least altered CM chondrites. The bulk chemistry of Maribo is typical of CM chondrites. Trapped noble gases are similar in abundance and isotopic composition to other CM chondrites, stepwise heating data indicating the presence of gas components hosted by presolar diamond and silicon carbide. The organics in Maribo include components also seen in Murchison as well as nitrogen‐rich components unique to Maribo. |
| |
| Keywords: | |
|
|
