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| Detailed File Information |
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Description
This upload contains the 40Ar/39Ar geochronology age determination of sample HO-HI-3 from Marquesas Islands in French Polynesia and was calculated using the ArArCALC freeware. The preferred age of 2.5933 ± 0.0028 Ma is the age plateau and is interpreted as the eruption age of the sample. The plateau displays a fairly long recoil pattern (consistant with the glass nature of the groundmass). The plateau steps downward in apparent age continually until about 45 % 39Ar is released. Then a more consistant plateau is produced followed by high temperature recoil effects. If the couple recoil steps prior to where I chose the plateau are included the age becomes 2598 ka. The age determination was carried out on a sample of basalt (groundmass) in an incremental heating experiment and using the in situ laser heating extraction method. The analyses were run on a ARGUS-VI mass spectrometer and the ages were calculated relative to flux monitor FCT-NM (R98) (4C25-14) (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: Hanaiapa Bay, Hiva Oa Island, Marquesas Islands, French Polynesia. Lat/Long/Elevation is approximate. . |
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Geological Age Range and Timescale
0.8972 - 0.8972 Ma |
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Location
9º 43.20' S - 9º 43.20' S 139º 00.60' W - 139º 00.60' W, French Polynesia, HO-HI-3, 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-HI-3 (IGSN), 15D04293 (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 mg (Sample Weight), Volcanic Island (Feature Type) |
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