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40Ar/39Ar Age Determination 14D32879 (IESS10046 - Harpooner Guyot)
File Name IESS10046.14D32879.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.7.0
File Size 1.22 MB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Susan Schnur
Source Schnur 2017
http://earthref.org/ERDA/IESS10046/
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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