EarthRef.org Digital Archive (ERDA)
Development and Maintenance by the EarthRef.org Database Team

Detailed File Information
40Ar/39Ar Age Determination 06C3069 (KOP000010 - Savai'i Island, Samoa)
File Name KOP000010.06C3069.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.5.1
File Size 760.00 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/KOP000010
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample SAV-4 2F11-06 (ALIA 115-18) from Savai'i Island, Samoa and was calculated using the ArArCALC freeware. The preferred age of 5.29 ± 0.10 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. The air intercept in the inverse isochron is indistinguishable from atmospheric argon. Relatively high uncertainty in the final age because of the low-K nature of this plagioclase mineral separate. The age determination was carried out on a sample of basalt (plagioclase 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
Click to return to previous page