The anomalous polymict ordinary chondrite breccia of Elmshorn (H3‐6)—Late reaccretion after collision between two ordinary chondrite parent bodies, complete disruption, and mixing possibly about 2.8 Gyr ago

• Published in: Meteoritics & planetary science 2024-09, Vol.59 (9), p.2321-2356
• Main Authors: Bischoff, Addi, Patzek, Markus, Alosius, Romain M. L., Barrat, Jean‐Alix, Berndt, Jasper, Busemann, Henner, Degering, Detlev, Di Rocco, Tommaso, Ek, Mattias, Gattacceca, Jérôme, Godinho, Jose R. A., Heinlein, Dieter, Krietsch, Daniela, Maden, Colin, Marchhart, Oscar, Martschini, Martin, Merchel, Silke, Pack, Andreas, Peters, Stefan, Rüfenacht, Miriam, Schlüter, Jochen, Schönbächler, Maria, Stojic, Aleksandra, Storz, Jakob, Tillmann, Wolfgang, Wieser, Alexander, Wimmer, Karl, Zielke, Reiner
• Format: Article
• Language: English
• Subjects: Physics
• ISSN: 1086-9379; 1945-5100
• DOI: 10.1111/maps.14193

Elmshorn fell April 25, 2023, about 30 km northwest of the city of Hamburg (Germany). Shortly after the fall, 21 pieces were recovered totaling a mass of 4277 g. Elmshorn is a polymict and anomalous H3‐6 chondritic, fragmental breccia. The rock is a mixture of typical H chondrite lithologies and clasts of intermediate H/L (or L, based on magnetic properties) chondrite origin. In some of the 21 pieces, the H chondrite lithologies dominate, while in others the H/L (or L) chondrite components are prevalent. The H/L chondrite assignment of these components is based on the mean composition of their olivines in equilibrated type 4 fragments (~Fa21–22). The physical properties like density (3.34 g cm−3) and magnetic susceptibility (logχ