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Detailed File Information
40Ar/39Ar Age Determination 06C3509 (KOP000009 - Savai'i Island, Samoa)
File Name KOP000009.06C3509.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.5.1
File Size 970.00 KB - 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/KOP000009
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample SAV-3 3E1-06 (ALIA 115-28) from Savai'i Island, Samoa and was calculated using the ArArCALC freeware. The preferred age of 4.98 ± 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 95%) that is concordant with the inverse and normal isochron ages. The air intercept in the inverse isochron is indistinguishable from atmospheric argon. Highly reproducible due to high K content feldspars between steps and also between plateau, total fusion and isochron ages. The age determination was carried out on a sample of basalt (k-feldspar <50µm) 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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