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| Detailed File Information |
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Description
This upload contains the 40Ar/39Ar geochronology age determination of sample HO-PUA-02 from Marquesas Islands in French Polynesia and was calculated using the ArArCALC freeware. The preferred age of 1.6980 ± 0.0018 Ma is the age plateau and is interpreted as the eruption age of the sample. The groundmass is clearly K rich and produced a long, high precision age spectrum. The sample displays a gradually decreasing apparent age. The decision on where to start the plateau was slightly subjective, however the resulting age doesn't vary more than a few ka depending on where the plateau begins. The higher temperature steps show some recoil patterns with a brief spike in apparent age, likely induced by the release of excess Ar from a melt inclusion. The age determination was carried out on a sample of basalt (groundmass) in an incremental heating experiment and using the in situ laser melting extraction method. The analyses were run on a ARGUS-VI mass spectrometer and the ages were calculated relative to flux monitor FCT-NM (6A6-15) (sanidine) with an age of 28.201 ± 0.082 Ma. This sample was collected by Kevin Konrad (Konradke@oregonstate.edu). Sample Description: 1x leach. Sample Treatment: Individual handsample from the Marquesas Islands. . Location Description: Puama'u Bay, Hiva Oa Island, Marquesas Islands, French Polynesia. Lat/Long/Elevation is approximate. . |
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Geological Age Range and Timescale
0.5213 - 0.5213 Ma |
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Location
9º 45.60' S - 9º 45.60' S 138º 52.80' W - 138º 52.80' W, French Polynesia, HO-PUA-02, 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/ArArCALC ... |
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Keywords
40Ar/39Ar, Geochronology, Radiometric Age Dating, K/Ar, Argon, Mass Spectrometry, ArArCALC, Data Reduction, IEKK1-HO-PUA-02 (IGSN), 16D06736 (Experiment), FRENCH POLYNESIA, MARQUESAS (14-INT-06) (Project), Manual (Collection Method), Individual Sample (Collection Object), Igneous>Volcanic>Mafic (Rock Classification), Groundmass (Mineral Type), 250-300 µm (Grain Size), 14.3 mg (Sample Weight), Volcanic Island (Feature Type) |
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