Chicxulub crater source for shocked zircon crystals from the Cretaceous-Tertiary boundary layer, Saskatchewan: Evidence from new U-Pb data

Research Article| March 01, 1995 Chicxulub crater source for shocked zircon crystals from the Cretaceous-Tertiary boundary layer, Saskatchewan: Evidence from new U-Pb data Sandra L. Kamo; Sandra L. Kamo 1Jack Satterly Geochronology Laboratory, Royal Ontario Museum, 100 Queen's Park, Toronto M5S 2C6, Ontario, Canada Search for other works by this author on: GSW Google Scholar Thomas E. Krogh Thomas E. Krogh 1Jack Satterly Geochronology Laboratory, Royal Ontario Museum, 100 Queen's Park, Toronto M5S 2C6, Ontario, Canada Search for other works by this author on: GSW Google Scholar Author and Article Information Sandra L. Kamo 1Jack Satterly Geochronology Laboratory, Royal Ontario Museum, 100 Queen's Park, Toronto M5S 2C6, Ontario, Canada Thomas E. Krogh 1Jack Satterly Geochronology Laboratory, Royal Ontario Museum, 100 Queen's Park, Toronto M5S 2C6, Ontario, Canada Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1995) 23 (3): 281–284. https://doi.org/10.1130/0091-7613(1995)023<0281:CCSFSZ>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 Sandra L. Kamo, Thomas E. Krogh; Chicxulub crater source for shocked zircon crystals from the Cretaceous-Tertiary boundary layer, Saskatchewan: Evidence from new U-Pb data. Geology 1995;; 23 (3): 281–284. doi: https://doi.org/10.1130/0091-7613(1995)023<0281:CCSFSZ>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 data for five of six individual shocked zircon grains from the Cretaceous-Tertiary (K-T) boundary fireball layer, Rock Creek site, south-central Saskatchewan, yield a source age of 548 ± 6 Ma. The collinear data points are variably discordant in proportion to the intensity of shock metamorphism exhibited by each zircon. The age and zircon shock features establish a strong temporal and genetic link with K-T distal ejecta from the fireball layer at the Berwind canyon site in the Raton basin, Colorado, where texturally similar zircons from a previous study gave an indistinguishable source age of 544 ± 5 Ma. These ages are in agreement with independent ages obtained from a previous study for single shocked zircons from the Chicxulub crater, Mexico, and from Beloc, Haiti. The U-Pb zircon data unequivocally support a meteorite impact origin for the global K-T boundary layer and imply that the Chicxulub crater is the sole North American target source. 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.