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Detailed File Information
40Ar/39Ar Age Determination 06C3085 (KOP000049 - Tama'i, Samoa)
File Name KOP000049.06C3085.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.5.1
File Size 940.00 KB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Anthony A.P. Koppers
Source Koppers et al. 2011
http://earthref.org/erda/KOP000049
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample TAM-2 2F7-06 (ALIA 111-05) from Tama'i, Samoa and was calculated using the ArArCALC freeware. The preferred age of 2.07 ± 0.03 Ma is the age plateau and is interpreted as the eruption age of the sample. An excellent age plateau (with a high probability of 70%) that is concordant with the inverse and normal isochron ages, but also with teh (recombined) total fusion age. The air intercept in the inverse isochron is indistinguishable from atmospheric argon. The age determination was carried out on a sample of trachybasalt (biotite 300-500µm) 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.edu).
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