A Precambrian proximal ejecta blanket from Scotland

Abstract

Research Article| April 01, 2008 A Precambrian proximal ejecta blanket from Scotland Kenneth Amor; Kenneth Amor 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Search for other works by this author on: GSW Google Scholar Stephen P. Hesselbo; Stephen P. Hesselbo 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Search for other works by this author on: GSW Google Scholar Don Porcelli; Don Porcelli 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Search for other works by this author on: GSW Google Scholar Scott Thackrey; Scott Thackrey 2Department of Geology and Petroleum Geology, Meston Building, King's College, Aberdeen AB24 3UE, UK Search for other works by this author on: GSW Google Scholar John Parnell John Parnell 2Department of Geology and Petroleum Geology, Meston Building, King's College, Aberdeen AB24 3UE, UK Search for other works by this author on: GSW Google Scholar Author and Article Information Kenneth Amor 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Stephen P. Hesselbo 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Don Porcelli 1Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK Scott Thackrey 2Department of Geology and Petroleum Geology, Meston Building, King's College, Aberdeen AB24 3UE, UK John Parnell 2Department of Geology and Petroleum Geology, Meston Building, King's College, Aberdeen AB24 3UE, UK Publisher: Geological Society of America Received: 27 Sep 2007 Revision Received: 12 Dec 2007 Accepted: 14 Dec 2007 First Online: 03 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 © 2008 Geological Society of America Geology (2008) 36 (4): 303–306. https://doi.org/10.1130/G24454A.1 Article history Received: 27 Sep 2007 Revision Received: 12 Dec 2007 Accepted: 14 Dec 2007 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Kenneth Amor, Stephen P. Hesselbo, Don Porcelli, Scott Thackrey, John Parnell; A Precambrian proximal ejecta blanket from Scotland. Geology 2008;; 36 (4): 303–306. doi: https://doi.org/10.1130/G24454A.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 Ejecta blankets around impact craters are rarely preserved on Earth. Although impact craters are ubiquitous on solid bodies throughout the solar system, on Earth they are rapidly effaced, and few records exist of the processes that occur during emplacement of ejecta. The Stac Fada Member of the Precambrian Stoer Group in Scotland has previously been described as volcanic in origin. However, shocked quartz and biotite provide evidence for high-pressure shock metamorphism, while chromium isotope values and elevated abundances of platinum group metals and siderophile elements indicate addition of meteoritic material. Thus, the unit is reinterpreted here as having an impact origin. The ejecta blanket reaches >20 m in thickness and contains abundant dark green, vesicular, devitrified glass fragments. Field observations suggest that the deposit was emplaced as a single fluidized flow that formed as a result of an impact into water-saturated sedimentary strata. The continental geological setting and presence of groundwater make this deposit an analogue for Martian fluidized ejecta blankets. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.