Impact origin for the Hummeln structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body

Abstract

Research Article| April 01, 2015 Impact origin for the Hummeln structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body C. Alwmark; C. Alwmark * 1Department of Geology, Lund University, Sölvegatan 12, 22362 Lund, Sweden *E-mail: carl.alwmark@geol.lu.se Search for other works by this author on: GSW Google Scholar L. Ferrière; L. Ferrière 2Natural History Museum, Burgring 7, A-1010 Vienna, Austria Search for other works by this author on: GSW Google Scholar S. Holm-Alwmark; S. Holm-Alwmark 1Department of Geology, Lund University, Sölvegatan 12, 22362 Lund, Sweden Search for other works by this author on: GSW Google Scholar J. Ormö; J. Ormö 3Centro de Astrobiología (CSIC-INTA), Instituto Nacional de Técnica Aeroespacial, Carretera de Torrejón a Ajalvir, km 4, 28850 Torrejón de Ardoz, Madrid, Spain Search for other works by this author on: GSW Google Scholar H. Leroux; H. Leroux 4Unité Matériaux et Transformations, UMR 8207, Université Lille 1 and CNRS, F-59655 Villeneuve d’Ascq, France Search for other works by this author on: GSW Google Scholar E. Sturkell E. Sturkell 5Department of Earth Sciences, University of Gothenburg, PO Box 460, SE-405 30 Gothenburg, Sweden Search for other works by this author on: GSW Google Scholar Author and Article Information C. Alwmark * 1Department of Geology, Lund University, Sölvegatan 12, 22362 Lund, Sweden L. Ferrière 2Natural History Museum, Burgring 7, A-1010 Vienna, Austria S. Holm-Alwmark 1Department of Geology, Lund University, Sölvegatan 12, 22362 Lund, Sweden J. Ormö 3Centro de Astrobiología (CSIC-INTA), Instituto Nacional de Técnica Aeroespacial, Carretera de Torrejón a Ajalvir, km 4, 28850 Torrejón de Ardoz, Madrid, Spain H. Leroux 4Unité Matériaux et Transformations, UMR 8207, Université Lille 1 and CNRS, F-59655 Villeneuve d’Ascq, France E. Sturkell 5Department of Earth Sciences, University of Gothenburg, PO Box 460, SE-405 30 Gothenburg, Sweden *E-mail: carl.alwmark@geol.lu.se Publisher: Geological Society of America Received: 07 Nov 2014 Revision Received: 07 Jan 2015 Accepted: 22 Jan 2015 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2015 Geological Society of America Geology (2015) 43 (4): 279–282. https://doi.org/10.1130/G36429.1 Article history Received: 07 Nov 2014 Revision Received: 07 Jan 2015 Accepted: 22 Jan 2015 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation C. Alwmark, L. Ferrière, S. Holm-Alwmark, J. Ormö, H. Leroux, E. Sturkell; Impact origin for the Hummeln structure (Sweden) and its link to the Ordovician disruption of the L chondrite parent body. Geology 2015;; 43 (4): 279–282. doi: https://doi.org/10.1130/G36429.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Several studies of meteorites show that a large disruption of an asteroid occurred ca. 470 Ma in our solar system’s asteroid belt. As a consequence, a large number of meteorite impacts occurred on Earth during the following few million years. The finding and characterization, for the first time, of planar deformation features in quartz grains from rocks collected at the Middle Ordovician Hummeln structure (Sweden) prove the hypervelocity impact origin of the structure. The unambiguous shock features allow us to close an ∼200-yr-old discussion about its origin, and further the hypothesis of enhanced asteroid bombardment during the Middle Ordovician, adding an impact crater to the increasing number confirmed and properly dated from this period. Despite its relatively small size (∼1.2 km in diameter), similar to the young Meteor Crater (Arizona, USA), and its old age, the Hummeln structure is remarkably well preserved, contradicting the general assumption that small craters are not preserved on Earth for more than a few tens of thousands to a couple of million years. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.