Dating of a regional hydrothermal system induced by the 1850 Ma Sudbury impact event

Abstract

Research Article| May 01, 1998 Dating of a regional hydrothermal system induced by the 1850 Ma Sudbury impact event D. E. Ames; D. E. Ames 1Geological Survey of Canada, Ottawa, Ontario K1A 0E8, Canada Search for other works by this author on: GSW Google Scholar D. H. Watkinson; D. H. Watkinson 2Ottawa-Carleton Geoscience Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada Search for other works by this author on: GSW Google Scholar R. R. Parrish R. R. Parrish 3National Engineering Research Council Isotope Geosciences Centre, Kingsley Dunham Centre, Keyworth, Nottinghamshire NG12 5GG, England Search for other works by this author on: GSW Google Scholar Author and Article Information D. E. Ames 1Geological Survey of Canada, Ottawa, Ontario K1A 0E8, Canada D. H. Watkinson 2Ottawa-Carleton Geoscience Centre, Carleton University, Ottawa, Ontario K1S 5B6, Canada R. R. Parrish 3National Engineering Research Council Isotope Geosciences Centre, Kingsley Dunham Centre, Keyworth, Nottinghamshire NG12 5GG, England Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1998) 26 (5): 447–450. https://doi.org/10.1130/0091-7613(1998)026<0447:DOARHS>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation D. E. Ames, D. H. Watkinson, R. R. Parrish; Dating of a regional hydrothermal system induced by the 1850 Ma Sudbury impact event. Geology 1998;; 26 (5): 447–450. doi: https://doi.org/10.1130/0091-7613(1998)026<0447:DOARHS>2.3.CO;2 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 New U-Pb geochronologic data from the Sudbury structure directly link extensive hydrothermal activity in crater-fill breccias with the 1850 Ma impact event, and constrain complex impact-induced processes to <4 m.y. Semiconformable alteration of breccias in the Onaping Formation includes silicification, albitization, chloritization, calcitization, and complex feldspathization, which directly underlies Zn-Cu-Pb ore deposits. Geochronologic data demonstrate a middle to lower crustal source for the crater-fill deposit that was subsequently affected by the hydrothermal event at 1848.4 +3.8/−1.8 Ma. These and other data confirm that the crater-fill breccia, hydrothermal system, Sudbury igneous complex, and its sublayer Ni-ore-bearing units were emplaced as a result of impact. The ages of events associated with the Sudbury structure are now more closely constrained than in any other meteorite impact structure. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.