Ar-Ar Geochronology for basalts dredged from seamounts in the south Tasman Sea during RV Investigator voyage IN2018_V08

This dataset presents Ar-Ar geochronological ages for mafic dredged rock samples from seamounts in the southern Tasman Sea and l’Atalante Basin. Rock samples were dredged during RV Investigator voyage IN2018_V08 in 2019, and the AGSO96 voyage in 1996. We interpreted recovered mafic samples as seamount edifice material. Representative sections of the freshest whole rock mafic samples, least affected by post-magmatic alteration, were selected for geochronology and geochemical analyses.We selected samples based on thin section examination for 40Ar-39Ar incremental heating experiments. All basaltic rocks dredged from the seafloor exhibit some degree of low temperature alteration of primary minerals and groundmass to secondary minerals, such as clay and zeolite.The data contains the sample id, seamount name, latitude, longitude, material analysed, age and error, %39Ar, MSWD, comment on the quality of the sample (green highlighted are the ages selected to contribute to a final seamount age), final seamount age.