The Renchen L5-6 chondrite breccia - The first confirmed meteorite fall from Baden-Wurttemberg (Germany)

Type Article
Date 2019-12
Language English
Author(s) Bischoff Addi1, Barrat Jean-Alix2, Berndt Jasper3, Borovicka Jiri4, Burkhardt Christoph1, Busemann Henner5, Hakenmueller Janina6, Heinlein Dieter7, Hertzog JasmineORCID8, 9, Kaiser Jozef10, Maden Colin5, Meier Matthias M. M.5, 11, Morino Precillia5, Pack Andreas12, Patzek Markus1, Reitze Maximilian P.1, Rufenacht Miriam5, Schmitt-Kopplin PhilippeORCID8, 9, Schonbachler Maria5, Spurny Pavel4, Weber Iris1, Wimmer Karl13, Zikmund Tomas11
Affiliation(s) 1 : Westfalische Wilhelms Univ Munster, Inst Planetol, Wilhelm Klemm Str 10, D-48149 Munster, Germany.
2 : Univ Bretagne Occidentale, Inst Univ Europeen Mer, Pl Nicolas Copernic, F-29280 Plouzane, France.
3 : Westfalische Wilhelms Univ Munster, Inst Mineral, Corrensstr 24, D-48149 Munster, Germany.
4 : Czech Acad Sci, Astron Inst, Fricova 298, CZ-25165 Ondrejov, Czech Republic.
5 : Swiss Fed Inst Technol, Inst Geochem & Petetrol, Clausiusstr 25, CH-8092 Zurich, Switzerland.
6 : Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany.
7 : German Fireball Network, Lilienstr 3, D-86156 Augsburg, Germany.
8 : German Res Ctr Environm Hlth, Helmholtz Zentrum, Analyt BioGeoChem, Ingolstadter Landstr 1, D-85764 Neuherberg, Germany.
9 : Tech Univ Munich, Chair Analyt Food Chem, D-85354 Freising Weihenstephan, Germany.
10 : Brno Univ Technol, CEITEC Cent European Inst Technol, Purkynova 123, CZ-61200 Brno, Czech Republic.
11 : Nat Museum St Gallen, Rorschacher Str 263, CH-9016 St Gallen, Switzerland.
12 : Univ Gottingen, Geowissensch Zentrum, Goldschmidtstr 1, D-37077 Gottingen, Germany.
13 : RiesKraterMuseum, Eugene Shoemaker Pl 1, D-86720 Nordlingen, Germany.
Source Geochemistry (0009-2819) (Elsevier Gmbh), 2019-12 , Vol. 79 , N. 4 , P. 125525 (19p.)
DOI 10.1016/j.chemer.2019.07.007
WOS© Times Cited 9
Keyword(s) Ordinary chondrite, Chondrite breccia, L chondrite, Meteorite fall
Abstract

On July 10, 2018 at 21:29 UT extended areas of South-Western Germany were illuminated by a very bright bolide. This fireball was recorded by instruments of the European Fireball Network (EN). The records enabled complex and precise description of this event including the prediction of the impact area. So far six meteorites totaling about 1.23 kg have been found in the predicted location for a given mass during dedicated searches. The first piece of about 12 g was recovered on July 24 close to the village of Renchen (Baden-Wurttemberg) followed by the largest fragment of 955 g on July 31 about five km north-west of Renchen. Renchen is a moderately-shocked (S4) breccia consisting of abundant highly recrystallized rock fragments as well as impact melt rock clasts. The texture, the large grain size of plagioclase, and the homogeneous compositions of olivine (similar to Fa(26)) and pyroxene (similar to Fs(22)) clearly indicate that Renchen is composed of metamorphosed rock fragments (L5-6). An L-group (and ordinary chondrite) heritage is consistent with the data on the model abundance of metal, the density, the magnetic susceptibility as well as on O-, Ti-, and Cr-isotope characteristics. Renchen does not contain solar wind implanted noble gases and is a fragmental breccia. An unusually large mm-sized merrillite-apatite aggregate shows trace element characteristics like other phosphates from ordinary chondrites. Data on the bulk chemistry, IR-spectroscopy, cosmogenic nuclides, and organic components also indicate similarities to other metamorphosed L chondrites. Noble gas studies reveal that the meteorite has a cosmic ray exposure (CRE) age of 42 Ma and that most of the cosmogenic gases were produced in a meteoroid with a radius of at max. 20 cm based on the radionuclide Al-26 and 10-150 cm based on cosmogenic Ne-22/Ne-21. K-Ar and U/Th-He gas retention ages are both in the range similar to 3.0-3.2 Ga. Both systems do not show evidence for a complete reset 470 Ma ago, and may instead have recorded the same resetting event 3.0 Ga ago.

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Bischoff Addi, Barrat Jean-Alix, Berndt Jasper, Borovicka Jiri, Burkhardt Christoph, Busemann Henner, Hakenmueller Janina, Heinlein Dieter, Hertzog Jasmine, Kaiser Jozef, Maden Colin, Meier Matthias M. M., Morino Precillia, Pack Andreas, Patzek Markus, Reitze Maximilian P., Rufenacht Miriam, Schmitt-Kopplin Philippe, Schonbachler Maria, Spurny Pavel, Weber Iris, Wimmer Karl, Zikmund Tomas (2019). The Renchen L5-6 chondrite breccia - The first confirmed meteorite fall from Baden-Wurttemberg (Germany). Geochemistry, 79(4), 125525 (19p.). Publisher's official version : https://doi.org/10.1016/j.chemer.2019.07.007 , Open Access version : https://archimer.ifremer.fr/doc/00637/74895/