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Description
This upload contains the 40Ar/39Ar geochronology age determination of sample TUL-1 2F9-06 (ALIA 109-07) from Tulaga, Samoa (Tulaga Ridge) and was calculated using the ArArCALC freeware. The preferred age of 0.88 ± 0.04 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 and also the (recombined) total fusion age. The age determination was carried out on a sample of phonolite (biotite 210-500µm) 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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Geological Age Range and Timescale
0.27 - 0.23 Ma |
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Location
14º 39.12' S - 14º 39.12' S 170º 01.44' E - 170º 01.44' E, American Samoa, TUL-1 2F9-06, Pacific Ocean, Pacific Plate |
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Instructions
This ERDA upload contains four separate 40Ar/39Ar age calculation files generated with ArArCALC. Both the XLS and PDF files are for easy viewing in Microsoft Excel or Adobe Acrobat Reader, whereas the AGE file is readable by the ArArCALC software only and the XML file is generated for the GEOCHRON online database project. For full age calculation functionality it is recommended that you open the AGE file in the ArArCALC software that is available as freeware online at http://earthref.org/tools/ararcalc.htm ... |
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Keywords
40Ar/39Ar, Geochronology, Radiometric Age Dating, K/Ar, Argon, Mass Spectrometry, ArArCALC, Data Reduction, KOP000036 (IGSN), 06C3109 (Experiment), SAMOA (Project), Dredging>Chain Bag (Collection Method), Ship (Platform Type), Mineral Specimen (Collection Object), Igneous>Volcanic>Mafic (Rock Classification), Phenocryst (Mineral Type), Biotite (Mineral Name), 210-500 µm (Grain Size), Seamount (Feature Type) |
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