Koronis asteroid dust within Antarctic ice

Research Article| September 01, 2008 Koronis asteroid dust within Antarctic ice Matthew J. Genge Matthew J. Genge 1Impact and Astromaterials Research Centre, Department of Earth Science and Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK, and Mineralogy Department, The Natural History Museum, Cromwell Road, London SW7 5BT, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Matthew J. Genge 1Impact and Astromaterials Research Centre, Department of Earth Science and Engineering, Imperial College London, Exhibition Road, London SW7 2AZ, UK, and Mineralogy Department, The Natural History Museum, Cromwell Road, London SW7 5BT, UK Publisher: Geological Society of America Received: 05 Nov 2007 Revision Received: 06 May 2008 Accepted: 17 May 2008 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2008 Geological Society of America Geology (2008) 36 (9): 687–690. https://doi.org/10.1130/G24493A.1 Article history Received: 05 Nov 2007 Revision Received: 06 May 2008 Accepted: 17 May 2008 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Matthew J. Genge; Koronis asteroid dust within Antarctic ice. Geology 2008;; 36 (9): 687–690. doi: https://doi.org/10.1130/G24493A.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 Here I report the first discovery of large numbers of ordinary chondrite–derived micro-meteorites (MMs) recovered from Antarctic ice. Ordinary chondrite–derived MMs comprise 70% coarse-grained igneous particles and are identified on the basis of their distribution of petrologic types, accessory mineralogy, and minor element compositions, all of which are very similar to those of millimeter-sized igneous objects known as chondrules, from ordinary chondrites, and largely distinct from those of other meteorite groups. The majority of ordinary chondrite–derived MMs are unequilibrated materials; however, 15% are equilibrated, indicating parent body metamorphism, and have compositions consistent with both H (high iron) and L (low iron) chondrites. The total abundance of ordinary chondrite–derived MMs of ~18% is similar to predictions by numerical calculations for the abundance of dust generated by the recent breakup of the Karin group asteroids of the Koronis asteroid family, suggesting that these asteroids are the main source of the particles. These MMs represent the first to be associated with a known asteroid and imply that the Karin group progenitor asteroid was a rubble-pile asteroid that sampled different depths within the original internally metamorphosed Koronis parent body. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.