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40Ar/39Ar Age Determination 06C2898 (KOP000008 - Savai'i Island, Samoa)
File Name KOP000008.06C2898.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.5.1
File Size 1.08 MB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Anthony A.P. Koppers
Source Koppers et al. 2008
http://earthref.org/erda/KOP000008
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample SAV-3 2F12-06 (ALIA 115-28) from Savai'i Island, Samoa and was calculated using the ArArCALC freeware. The preferred age of 5.04 ± 0.01 Ma is the age plateau and is interpreted as the eruption age of the sample. An excellent age plateau (with a high probability of 98%) that is concordant with the inverse and normal isochron ages. The air intercept in the inverse isochron is indistinguishable from atmospheric argon. Despite alteration hardly any lasting effects of this as soon as entering the age plateau. No serious recoil effects. The age determination was carried out on a sample of basalt (groundmass 210-300µm) in an incremental heating experiment and using the bulk laser heating extraction method. The analyses were run on a MAP215-50 mass spectrometer and the ages were calculated relative to flux monitor FCT-3 (biotite) with an age of 28.030 ± 0.010 Ma. This sample was collected by Stan Hart (shart@whoi.com). Location Description: Deep submarine flanks of Savai'i Island.
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