MacLeod, Kenneth G. et al. (2003): (super 87) Sr/ (super 86) Sr test of the degree of impact-induced slope failure in the Maastrichtian of the western North Atlantic
Leg/Site/Hole:
Related Expeditions:
ODP 171B
Identifier:
ID:
2003-032323
Type:
georefid
ID:
10.1130/0091-7613(2003)031<0311:SSTOTD>2.0.CO;2
Type:
doi
Creator:
Name:
MacLeod, Kenneth G.
Affiliation:
University of Missouri, Columbia, Department of Geological Sciences, Columbia, MO, United States
Role:
author
Name:
Fullagar, Paul D.
Affiliation:
University of North Carolina, United States
Role:
author
Name:
Huber, Brian T.
Affiliation:
Smithsonian Institution, United States
Role:
author
Identification:
Title:
(super 87) Sr/ (super 86) Sr test of the degree of impact-induced slope failure in the Maastrichtian of the western North Atlantic
Year:
2003
Source:
Geology (Boulder)
Publisher:
Geological Society of America (GSA), Boulder, CO, United States
Volume:
31
Issue:
4
Pages:
311-314
Abstract:
Analyses of (super 87) Sr/ (super 86) Sr in foraminifera and sedimentological observations suggest that the Chicxulub impact was not the trigger for slumps or a hiatus within the Maastrichtian section recovered at Ocean Drilling Program Sites 1049, 1050, and 1052 (subtropical western North Atlantic). The slumps and hiatus occur within a sequence dominated by pelagic chalk. The (super 87) Sr/ (super 86) Sr measurements show a general increase through the Maastrichtian at each site, but suggest chronostratigraphic gaps on the order of 10 (super 6) yr across the slumps. Some of the slumps have burrowed upper surfaces and are composed of material that is older and coarser grained than the bounding chalks. Pelagic deposition punctuated by gravity flows easily explains the Maastrichtian record on Blake Nose, whereas an impact-based explanation for slumping is difficult to reconcile with sedimentological and geochemical observations.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:30.0832 West:-76.3736 East:
-76.0644 South:29.5705
Keywords: Stratigraphy; Isotope geochemistry; alkaline earth metals; Atlantic Ocean; biochemistry; Blake Nose; Blake Plateau; carbonate rocks; Cenozoic; chalk; chronostratigraphy; Cretaceous; Foraminifera; geochemistry; gravity flows; Invertebrata; isotope ratios; isotopes; K-T boundary; Leg 171B; lower Paleocene; Maestrichtian; mass movements; Mesozoic; metals; microfossils; North Atlantic; Northwest Atlantic; Ocean Drilling Program; ODP Site 1049; ODP Site 1050; ODP Site 1052; paleo-oceanography; Paleocene; Paleogene; pelagic environment; planktonic taxa; Protista; sedimentary rocks; Senonian; slumping; Sr-87/Sr-86; stable isotopes; stratigraphic boundary; stratigraphic gaps; strontium; Tertiary; Upper Cretaceous;
.