(Table 1) 87Sr/86Sr results for the Cretaceous-Tertiary boundary, ODP Hole 171-1049C, supplement to: MacLeod, Kenneth G; Huber, Brian T; Fullagar, Paul D (2001): Evidence for a small (~0.000030) but resolvable increase in seawater 87Sr/86Sr ratios across the Cretaceous-Tertiary boundary. Geology, 29(4), 303-306


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.

DOI https://doi.org/10.1594/PANGAEA.712627
Related Identifier https://doi.org/10.1130/0091-7613(2001)029<0303:EFASBR>2.0.CO
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.712627
Creator MacLeod, Kenneth G; Huber, Brian T; Fullagar, Paul D
Publisher PANGAEA - Data Publisher for Earth & Environmental Science
Publication Year 2001
Rights Creative Commons Attribution 3.0 Unported
OpenAccess true
Language English
Resource Type Supplementary Dataset
Format text/tab-separated-values
Size 155 data points
Discipline Earth System Research
Spatial Coverage (-76.112 LON, 30.142 LAT); Blake Nose, North Atlantic Ocean