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40Ar/39Ar Age Determination 13D04309 (IESS10014 - Crawford Guyot)
File Name IESS10014.13D04309.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.7.0
File Size 1.08 MB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Susan Schnur
Source http://earthref.org/ERDA/IESS10014/
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample MV1203-D43B-07 from Crawford Guyot in Walvis Ridge and was calculated using the ArArCALC freeware. The preferred age of 11.54 ± 0.01 Ma is the age plateau and is interpreted as the eruption age of the sample. Slanting slightly upwards but plateau is fine. Excess argon signature. The age determination was carried out on a sample of trachyte (feldspar) 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 + heavy liquid separation.. Sample Treatment: Aphanitic, moderately vesicular basalt. Slightly altered GM, sparsely plag-phyric, tr bt phenox..
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