Strontium and rubidium concentrations of ODP Site 104-642 (Table 1)

• Main Authors: Smalley, P Craig, Qvale, G, Qvale, H
• Format: Dataset
• Language: English
• Published: PANGAEA 1989
• Subjects: 104-642B; 104-642D; Age; dated; dated standard deviation; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Isotope dilution; Joides Resolution; Leg104; Material; Norwegian Sea; Ocean Drilling Program; ODP; Rubidium; Rubidium/Strontium ratio; Rubidium-87/Strontium-86 ratio; Sample code/label; Strontium; Strontium-87/Strontium-86 ratio; error
• Online Access: https://doi.pangaea.de/10.1594/PANGAEA.736458; https://doi.org/10.1594/PANGAEA.736458

We have attempted to date several samples from Site 642 using a combination of Sr isotope stratigraphy and Rb-Sr dating of glauconite. A carbonate shell fragment from Sample 104-642B-22H-6, 70-73 cm gives a Sr isotope stratigraphy date of 17.3 +/- 1.0 Ma, which agrees well with available biostratigraphic and paleomagnetic data. Glauconites from a nearby sample (104-642B-23H-1, 66-69 cm) give a similar date. One carbonate shell fragment and two fish teeth samples from Core 104-642D-12X give concordant Sr isotope stratigraphy ages of about 37 Ma (latest Eocene). Rb-Sr glauconite analyses from one of the samples, while showing some substrate contamination, also support an Eocene age. Our results are in conflict with Miocene palynomorph dates from Core 104-642D-12X. As specific reworking of fish teeth and carbonate macrofossils (and also glauconite) from 37 Ma old sediments into three different samples in Core 104-642D-12X is most unlikely, we view the 37-Ma date as the depositional age of the core.