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40Ar/39Ar Age Determination 13D04550 (IESS10020 - Dusky Guyot)
File Name IESS10020.13D04550.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.7.0
File Size 1.15 MB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Susan Schnur
Source http://earthref.org/ERDA/IESS10020/
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample MV1203-D40-02 from Dusky Guyot in Walvis Ridge and was calculated using the ArArCALC freeware. The preferred age of 25.15 ± 0.01 Ma is the age plateau and is interpreted as the eruption age of the sample. Slight downwards slant, but age seems acceptable. The age determination was carried out on a sample of trachyandesite (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 (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: Aphanitic, sparsely vesicular basalt. Highly altered GM, sparsely cpx-plag phyric, tr hbl and bt..
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