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The fall, recovery, classification, and initial characterization of the Hamburg, Michigan H4 chondrite

Journal Article · · Meteoritics and Planetary Science
DOI:https://doi.org/10.1111/maps.13584· OSTI ID:1690295
 [1];  [1];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [5];  [14];  [15];  [16];  [17];  [17] more »;  [18];  [19];  [17];  [20];  [21];  [21];  [21];  [21];  [8] « less
  1. Robert A. Pritzker Center for Meteoritics and Polar Studies Negaunee Integrative Research Center The Field Museum of Natural History 1400 South Lake Shore Drive Chicago Illinois 60605 USA, Chicago Center for Cosmochemistry and Department of the Geophysical Sciences The University of Chicago 5734 South Ellis Avenue Chicago Illinois 60637‐1433 USA
  2. Department of Earth, Environmental and Planetary Sciences Brown University 324 Brook Street Box 1846 Providence Rhode Islands 02912 USA
  3. Bayerisches Geoinstitut Universität Bayreuth Universitätsstraße 30 95447 Bayreuth Germany, Department of Earth Sciences University of Western Ontario BGS 1026, 1151 Richmond Street London Ontario N6A 5B7 Canada
  4. Department of Physics and Astronomy Purdue University West Lafayette Indiana 47906 USA, Department of Earth, Atmospheric, and Planetary Sciences Purdue University West Lafayette Indiana 47906 USA
  5. Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory 7000 East Avenue (L‐235) Livermore California 94550 USA
  6. Department of Mineral Sciences National Museum of Natural History Smithsonian Institution 10th St and Constitution Ave, NW Washington District of Columbia USA
  7. Robert A. Pritzker Center for Meteoritics and Polar Studies Negaunee Integrative Research Center The Field Museum of Natural History 1400 South Lake Shore Drive Chicago Illinois 60605 USA, Chicago Center for Cosmochemistry and Department of the Geophysical Sciences The University of Chicago 5734 South Ellis Avenue Chicago Illinois 60637‐1433 USA, Enrico Fermi Institute The University of Chicago 5734 South Ellis Avenue Chicago Illinois 60637‐1433 USA
  8. Department of Earth Sciences University of Toronto 22 Russell St Toronto Ontario M5S 3B1 Canada
  9. Astromaterials Research and Exploration Science Division NASA Johnson Space Center Mail Code XI2 Building 31 Houston Texas USA
  10. American Meteor Society 54 Westview Crescent Geneseo New York 14454 USA
  11. SETI Institute 189 Bernardo Avenue Mountain View California 94043 USA, NASA Ames Research Center Moffett Field California 94035 USA
  12. Helmholtz Zentrum München Deutsches Forschungszentrum für Gesundheit und Umwelt (GmbH), Ingolstädter Landstr. 1 85764 Neuherberg Germany
  13. Chicago Center for Cosmochemistry and Department of the Geophysical Sciences The University of Chicago 5734 South Ellis Avenue Chicago Illinois 60637‐1433 USA
  14. Department of Mineral Sciences National Museum of Natural History Smithsonian Institution 10th St and Constitution Ave, NW Washington District of Columbia USA, Department of Earth and Environmental Sciences Michigan State University 288 Farm Lane, 207 Natural Sciences Building East Lansing Michigan 48824 USA
  15. Albany Medical College 43 New Scotland Ave Albany New York 12208 USA
  16. Space Sciences Laboratory University of California 7 Gauss Way Berkeley California 94720‐7450 USA
  17. Department of Earth and Planetary Sciences University of California at Davis One Shields Avenue Davis California 95616 USA
  18. Institute of Meteoritics University of New Mexico 221 Yale Blvd NE, 313 Northrop Hall Albuquerque New Mexico 87131 USA
  19. Center for Molecular and Genomic Imaging University of California at Davis Davis California 95616 USA
  20. National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 China
  21. State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing 100029 China
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Abstract

The Hamburg meteorite fell on January 16, 2018, near Hamburg, Michigan, after a fireball event widely observed in the U.S. Midwest and in Ontario, Canada. Several fragments fell onto frozen surfaces of lakes and, thanks to weather radar data, were recovered days after the fall. The studied rock fragments show no or little signs of terrestrial weathering. Here, we present the initial results from an international consortium study to describe the fall, characterize the meteorite, and probe the collision history of Hamburg. About 1 kg of recovered meteorites was initially reported. Petrology, mineral chemistry, trace element and organic chemistry, and O and Cr isotopic compositions are characteristic of H4 chondrites. Cosmic ray exposure ages based on cosmogenic 3 He, 21 Ne, and 38 Ar are ~12 Ma, and roughly agree with each other. Noble gas data as well as the cosmogenic 10 Be concentration point to a small 40–60 cm diameter meteoroid. An 40 Ar‐ 39 Ar age of 4532 ± 24 Ma indicates no major impact event occurring later in its evolutionary history, consistent with data of other H4 chondrites. Microanalyses of phosphates with LA‐ICPMS give an average Pb‐Pb age of 4549 ± 36 Ma. This is in good agreement with the average SIMS Pb‐Pb phosphate age of 4535.3 ± 9.5 Ma and U‐Pb Concordia age of 4535 ± 10 Ma. The weighted average age of 4541.6 ± 9.5 Ma reflects the metamorphic phosphate crystallization age after parent body formation in the early solar system.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; AC52-07NA27344
OSTI ID:
1690295
Alternate ID(s):
OSTI ID: 1787149
OSTI ID: 1798433
Journal Information:
Meteoritics and Planetary Science, Journal Name: Meteoritics and Planetary Science Journal Issue: 11 Vol. 55; ISSN 1086-9379
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United States
Language:
English

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