(Table 1) 87Sr/86Sr results for the Cretaceous-Tertiary boundary, ODP Hole 171-1049C

Previous studies of 87Sr/86Sr 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 ra...

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Bibliographic Details
Main Authors: MacLeod, Kenneth G, Huber, Brian T, Fullagar, Paul D
Format: Dataset
Language:English
Published: PANGAEA 2001
Subjects:
171-1049C
Blake Nose
North Atlantic Ocean
Calculated
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Joides Resolution
Leg171B
Mass spectrometer VG Sector 54
Ocean Drilling Program
ODP
Sample code/label
Sample comment
Sample type
Strontium-87/Strontium-86 ratio
error
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.712627
https://doi.org/10.1594/PANGAEA.712627
Description
Summary:Previous studies of 87Sr/86Sr 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 ~0.000030 in seawater 87Sr/ 86Sr 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 ~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 87Sr/86Sr excursion can be explained by enhanced continental weathering, perhaps related to acid rain in the aftermath of the K-T impact.

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