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Detailed File Information
40Ar/39Ar Age Determination 07C2033 (KOP000055 - Combe, Samoa)
File Name KOP000055.07C2033.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.5.1
File Size 952.00 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/KOP000055
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample COM-2 4D11-06 (ALIA 123-02) from Combe, Samoa and was calculated using the ArArCALC freeware. The preferred age of 11.12 ± 0.06 Ma is the age plateau and is interpreted as the eruption age of the sample. A good age plateau that is concordant with the inverse and normal isochron ages. Low temperature portion of the age spectra shows apparently higher ages likely due to some remaining alteration that is present in this altered submarine basalt sample. 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.edu).
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