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Description
This upload contains the 40Ar/39Ar geochronology age determination of sample MV1203-D56-18 from Harpooner Guyot in Walvis Ridge and was calculated using the ArArCALC freeware. The preferred age of 35.46 ± 0.01 Ma is the age plateau and is interpreted as the eruption age of the sample. Good plateau The age determination was carried out on a sample of trachyte (biotite) in an incremental heating experiment and using the bulk 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 (4B17-14) (sanidine) with an age of 28.201 ± 0.082 Ma. This sample was collected by Anthony Koppers (akoppers@ceoas.oregonstate.edu). Sample Description: Standard but no leaching.
. Sample Treatment: Fine-grained, avesicular basalt. Slightly altered GM, moderately bt-phyric, sparsely plag-phyric. Trachyte composition unconfirmed - assumed based on mineralogy.. |
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Geological Age Range and Timescale
11.86 - 11.85 Ma |
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Location
37º 18.24' S - 37º 18.24' S 3º 49.32' W - 3º 49.32' W, MV1203-D56-18, Atlantic Ocean, African 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, IESS10046 (IGSN), 14D32879 (Experiment), WALVIS RIDGE, MV1203 (13-INT-04) (Project), Dredging (Collection Method), Ship (Platform Type), Individual Sample (Collection Object), Igneous>Volcanic>Mafic (Rock Classification), Phenocryst (Mineral Type), Biotite (Mineral Name), 300-500 µm (Grain Size), 5.1 mg (Sample Weight), Seamount (Feature Type) |
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