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Detailed File Information
40Ar/39Ar Age Determination 07C1694 (KOP000046 - Tama'i, Samoa)
File Name KOP000046.07C1694.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.5.1
File Size 997.00 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/KOP000046
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample TAM-1 4D4-06 (ALIA 111-07) from Tama'i, Samoa and was calculated using the ArArCALC freeware. The preferred age of 1.87 ± 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 97%) that is compatible with the inverse and normal isochron ages (which have only a small spreading factor of 21.7%) but is concordant with the (recombined) total fusion age. The age determination was carried out on a sample of trachybasalt (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.edu).
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