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Discovery of distal ejecta from the 1850 Ma Sudbury impact event

2005; Geological Society of America; Volume: 33; Issue: 3 Linguagem: Inglês

10.1130/g21048.1

1943-2682

William D. Addison, Gregory R. Brumpton, Daniela A. Vallini, Neal J. McNaughton, D. W. Davis, S. A. Kissin, Philip Fralick, A. L. Hammond,

Planetary Science and Exploration

Research Article| March 01, 2005 Discovery of distal ejecta from the 1850 Ma Sudbury impact event William D. Addison; William D. Addison 1R.R. 2, Kakabeka Falls, Ontario P0T 1W0, Canada Search for other works by this author on: GSW Google Scholar Gregory R. Brumpton; Gregory R. Brumpton 2211 Henry Street, Thunder Bay, Ontario P7E 4Y7, Canada Search for other works by this author on: GSW Google Scholar Daniela A. Vallini; Daniela A. Vallini 3Centre for Global Metallogeny, School of Earth and Geographic Sciences, University of Western Australia, Nedlands, Western Australia 6009, Australia Search for other works by this author on: GSW Google Scholar Neal J. McNaughton; Neal J. McNaughton 3Centre for Global Metallogeny, School of Earth and Geographic Sciences, University of Western Australia, Nedlands, Western Australia 6009, Australia Search for other works by this author on: GSW Google Scholar Don W. Davis; Don W. Davis 4Department of Geology, Earth Sciences Centre, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada Search for other works by this author on: GSW Google Scholar Stephen A. Kissin; Stephen A. Kissin 5Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada Search for other works by this author on: GSW Google Scholar Philip W. Fralick; Philip W. Fralick 5Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada Search for other works by this author on: GSW Google Scholar Anne L. Hammond Anne L. Hammond 5Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information William D. Addison 1R.R. 2, Kakabeka Falls, Ontario P0T 1W0, Canada Gregory R. Brumpton 2211 Henry Street, Thunder Bay, Ontario P7E 4Y7, Canada Daniela A. Vallini 3Centre for Global Metallogeny, School of Earth and Geographic Sciences, University of Western Australia, Nedlands, Western Australia 6009, Australia Neal J. McNaughton 3Centre for Global Metallogeny, School of Earth and Geographic Sciences, University of Western Australia, Nedlands, Western Australia 6009, Australia Don W. Davis 4Department of Geology, Earth Sciences Centre, University of Toronto, 22 Russell Street, Toronto, Ontario M5S 3B1, Canada Stephen A. Kissin 5Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada Philip W. Fralick 5Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada Anne L. Hammond 5Department of Geology, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada Publisher: Geological Society of America Received: 28 Jul 2004 Revision Received: 29 Oct 2004 Accepted: 02 Nov 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2005) 33 (3): 193–196. https://doi.org/10.1130/G21048.1 Article history Received: 28 Jul 2004 Revision Received: 29 Oct 2004 Accepted: 02 Nov 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation William D. Addison, Gregory R. Brumpton, Daniela A. Vallini, Neal J. McNaughton, Don W. Davis, Stephen A. Kissin, Philip W. Fralick, Anne L. Hammond; Discovery of distal ejecta from the 1850 Ma Sudbury impact event. Geology 2005;; 33 (3): 193–196. doi: https://doi.org/10.1130/G21048.1 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 A 25–70-cm-thick, laterally correlative layer near the contact between the Paleoproterozoic sedimentary Gunflint Iron Formation and overlying Rove Formation and between the Biwabik Iron Formation and overlying Virginia Formation, western Lake Superior region, contains shocked quartz and feldspar grains found within accretionary lapilli, accreted grain clusters, and spherule masses, demonstrating that the layer contains hypervelocity impact ejecta. Zircon geochronologic data from tuffaceous horizons bracketing the layer reveal that it formed between ca. 1878 Ma and 1836 Ma. The Sudbury impact event, which occurred 650–875 km to the east at 1850 ± 1 Ma, is therefore the likely ejecta source, making these the oldest ejecta linked to a specific impact. Shock features, particularly planar deformation features, are remarkably well preserved in localized zones within the ejecta, whereas in other zones, mineral replacement, primarily carbonate, has significantly altered or destroyed ejecta features. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.