K-Ar data for whole-rock basalts at ODP Hole 105-647A (Table 1)

Alteration of basalt samples in the basement rocks of Site 647 produced a range of K-Ar ages from 35 to 71 Ma. Microprobe data indicate that an alteration phase contributes nearly 50% of the potassium in the samples. Thus, a component with uncertain argon-retention characteristics is considered resp...

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Bibliographic Details
Main Author: Roddick, J C
Format: Dataset
Language:English
Published: PANGAEA 1989
Subjects:
105-647A
Age
dated
dated standard deviation
Argon-40
DEPTH
sediment/rock
DRILL
Drilling/drill rig
DSDP/ODP/IODP sample designation
Joides Resolution
Leg105
North Atlantic Ocean
Ocean Drilling Program
ODP
Potassium
standard deviation
Sample code/label
Sample code/label 2
North Atlantic
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.745269
https://doi.org/10.1594/PANGAEA.745269
Description
Summary:Alteration of basalt samples in the basement rocks of Site 647 produced a range of K-Ar ages from 35 to 71 Ma. Microprobe data indicate that an alteration phase contributes nearly 50% of the potassium in the samples. Thus, a component with uncertain argon-retention characteristics is considered responsible for the range of ages. While the older ages are consistent with the expected magnetic anomaly age and the fossil evidence, the presence of the alteration makes these ages unreliable for defining the age of the basaltic crust.

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