{"id":25211,"date":"2020-10-27T21:13:07","date_gmt":"2020-10-27T19:13:07","guid":{"rendered":"http:\/\/karmaka.de\/?p=25211"},"modified":"2020-10-27T21:13:16","modified_gmt":"2020-10-27T19:13:16","slug":"the-fall-recovery-classification-and-initial-characterization-of-the-hamburg-michigan-h4-chondrite","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=25211","title":{"rendered":"The fall, recovery, classification, and initial characterization of the Hamburg, Michigan H4 chondrite<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Philipp R. Heck, Jennika Greer, Joseph S. Boesenberg, Audrey Bouvier, Marc W. Caffee, William S. Cassata, Catherine Corrigan, Andrew M. Davis, Donald W. Davis, Marc Fries, Mike Hankey, Peter Jenniskens, Philippe Schmitt\u2010Kopplin, Shannon Sheu, Reto Trappitsch, Michael Velbel, Brandon Weller, Kees Welten, Qing\u2010Zhu Yin, Matthew E. Sanborn, Karen Ziegler, Douglas Rowland, Kenneth L. Verosub, Qin Zhou, Yu Liu, Guoqiang Tang, Qiuli Li, Xianhua Li, Zoltan Zajacz<\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13584\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13584\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;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 3He, 21Ne, and 38Ar are ~12 Ma, and roughly agree with each other. Noble gas data as well as the cosmogenic 10Be concentration point to a small 40\u201360 cm diameter meteoroid. An 40Ar\u201039Ar age of 4532 \u00b1 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\u2010ICPMS give an average Pb\u2010Pb age of 4549 \u00b1 36 Ma. This is in good agreement with the average SIMS Pb\u2010Pb phosphate age of 4535.3 \u00b1 9.5 Ma and U\u2010Pb Concordia age of 4535 \u00b1 10 Ma. The weighted average age of 4541.6 \u00b1 9.5 Ma reflects the metamorphic phosphate crystallization age after parent body formation in the early solar system.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Philipp R. Heck, Jennika Greer, Joseph S. Boesenberg, Audrey Bouvier, Marc W. Caffee, William S. Cassata, Catherine Corrigan, Andrew M. Davis, Donald W. Davis, Marc Fries, Mike Hankey, Peter Jenniskens, Philippe Schmitt\u2010Kopplin, Shannon Sheu, Reto&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,4828,7,47],"tags":[4829,1807,1832],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/25211"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=25211"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/25211\/revisions"}],"predecessor-version":[{"id":25212,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/25211\/revisions\/25212"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25211"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25211"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25211"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}