K-Ar ages of basalts from islands of the Franz Josef Land archipelago

New K-Ar age determinations of basalt samples from three drill holes and outcrops on the Franz Josef Land suggest that flood volcanism throughout the archipelago fits in a very narrow age interval (116±5 Ma). For 95% of the samples we studied, age scatter is within analytical uncertainty. New data o...

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Bibliographic Details
Main Authors: Grachev, A F, Arakelyantz, M M, Lebedev, V A, Musatov, Evgeny E, Stolbov, N M
Format: Dataset
Language:English
Published: PANGAEA 2001
Subjects:
Alexandra Land Island
Franz Josef Land
Archive of Ocean Data
ARCOD
DRILL
Drilling/drill rig
FJL-5534-1
George Land
GL-5505-1A
Graham Bell Island
Greeley Island
H-5547-1
H-5547-2A
Hays-1
Hays Island
Hooker Island
Jackson Island
MK-1
Nagursk-1
Northern-1
OG-98-3A
V-98-4
VNIIO-1979
VNIIO-1980
Wiener Neustadt Island
WN-3674
Bell Island
Canada
Hooker
canada basin
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.746727
https://doi.org/10.1594/PANGAEA.746727
Description
Summary:New K-Ar age determinations of basalt samples from three drill holes and outcrops on the Franz Josef Land suggest that flood volcanism throughout the archipelago fits in a very narrow age interval (116±5 Ma). For 95% of the samples we studied, age scatter is within analytical uncertainty. New data on basaltic bulk-rock, trace element, and REE compositions point to mantle plume affinity for Early Cretaceous magmatism on the Franz Josef Land, which preceded the onset of seafloor spreading in the Canada Basin.

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