|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 Jack Satterly Geochronology Laboratory, Royal Ontario Museum, 100 Queen's Park, Toronto M5S 2C6, Ontario, Canada
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 article has been cited by other articles:
|
|
 |
|
  M. Rocher, M. ROCHER, A. TREMBLAY, D. LAVOIE, and A. CAMPEAU Brittle fault evolution of the Montreal area (St Lawrence Lowlands, Canada): rift-related structural inheritance and tectonism approached by palaeostress analysis Geological Magazine, March 1, 2003; 140(2): 157 - 172. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 D. Davis, D. W. Davis, T. E. Krogh, and I. S. Williams Historical Development of Zircon Geochronology Reviews in Mineralogy and Geochemistry, January 1, 2003; 53(1): 145 - 181. [Full Text] [PDF]
|
|
|
|
 |
|
 W. U. REIMOLD, H. LEROUX, and R. L. GIBSON Shocked and thermally metamorphosed zircon from the Vredefort impact structure, South Africa: a transmission electron microscopic study European Journal of Mineralogy, October 1, 2002; 14(5): 859 - 868. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 B. P. Glass, S. Liu, and P. B. Leavens Reidite: An impact-produced high-pressure polymorph of zircon found in marine sediments American Mineralogist, April 1, 2002; 87(4): 562 - 565. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 R. C. Ewing THE DESIGN AND EVALUATION OF NUCLEAR-WASTE FORMS: CLUES FROM MINERALOGY Can Mineral, June 1, 2001; 39(3): 697 - 715. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 B.P. Glass and S. Liu Discovery of high-pressure ZrSiO4 polymorph in naturally occurring shock-metamorphosed zircons Geology, April 1, 2001; 29(4): 371 - 373. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 R. C. Ewing Nuclear waste forms for actinides PNAS, March 30, 1999; 96(7): 3432 - 3439. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 W. Alvarez, W. Alvarez, P. Claeys, and S. W. Kieffer Emplacement of Cretaceous-Tertiary Boundary Shocked Quartz from Chicxulub Crater Science, August 18, 1995; 269(5226): 930 - 935. [Abstract] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
