MacLeod, Kenneth G. et al. (2001): Evidence for a small ( approximately 0.000 030) but resolvable increase in seawater (super 87) Sr/ (super 86) Sr ratios across the Cretaceous-Tertiary boundary
Leg/Site/Hole:
Related Expeditions:
ODP 171B
Identifier:
ID:
2001-030985
Type:
georefid
Creator:
Name:
MacLeod, Kenneth G.
Affiliation:
University of Missouri, Department of Geological Sciences, Columbia, MO, United States
Role:
author
Name:
Huber, Brian T.
Affiliation:
Smithsonian Institution, United States
Role:
author
Name:
Fullagar, Paul D.
Affiliation:
University of North Carolina at Chapel Hill, United States
Role:
author
Identification:
Title:
Evidence for a small ( approximately 0.000 030) but resolvable increase in seawater (super 87) Sr/ (super 86) Sr ratios across the Cretaceous-Tertiary boundary
Year:
2001
Source:
Geology (Boulder)
Publisher:
Geological Society of America (GSA), Boulder, CO, United States
Volume:
29
Issue:
4
Pages:
303-306
Abstract:
Previous studies of (super 87) Sr/ (super 86) Sr patterns across the Cretaceous-Tertiary (K-T) boundary have generated inconsistent results. Analyses of samples from Ocean Drilling Program Hole 1049C provide better taphonomic and diagenetic control than has been previously achieved and indicate (1) that there was a rapid increase of approximately 0.000 030 in seawater (super 87) Sr/ (super 86) Sr ratios across the K-T boundary, (2) that post-K-T Cretaceous foraminifera at this site are reworked, and (3) that subtle diagenetic overprinting affects the basal approximately 15 cm of the Danian ooze. These conclusions are consistent with the asteroid impact hypothesis. Reworking rather than survivorship confirms nearly complete extinction of Cretaceous Tethyan planktic foraminifera; the (super 87) Sr/ (super 86) Sr excursion can be explained by enhanced continental weathering, perhaps related to acid rain in the aftermath of the K-T impact.
Language:
English
Genre:
Serial
Rights:
URL:
Coverage: Geographic coordinates: North:30.0832 West:-76.0644 East:
-76.0644 South:30.0832
Keywords: Stratigraphy; Isotope geochemistry; alkaline earth metals; Atlantic Ocean; biochemistry; Blake Nose; Blake Plateau; Cenozoic; chemostratigraphy; clastic sediments; cores; Cretaceous; diagenesis; extinction; Foraminifera; geochemical anomalies; geochemistry; Invertebrata; isotope ratios; isotopes; K-T boundary; Leg 171B; lower Paleocene; marine sediments; Mesozoic; metals; microfossils; North Atlantic; Ocean Drilling Program; ODP Site 1049; ooze; paleo-oceanography; Paleocene; paleoecology; Paleogene; planktonic taxa; Protista; reworking; sediments; Sr-87/Sr-86; stable isotopes; stratigraphic boundary; strontium; Tertiary; Tethys; Upper Cretaceous; weathering;
.