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40Ar/39Ar Age Determination 14D30840 (IESS10041 - Contest Seamount)
File Name IESS10041.14D30840.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.7.0
File Size 1.10 MB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Susan Schnur
Source http://earthref.org/ERDA/IESS10041/
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample MV1203-D60-04 from Contest Seamount in Walvis Ridge and was calculated using the ArArCALC freeware. The preferred age of 40.98 ± 0.01 Ma is the age plateau and is interpreted as the eruption age of the sample. Relatively few steps in plateau, but fine. The age determination was carried out on a sample of trachyte (alkali-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 (4B30-14) (sanidine) with an age of 28.201 ± 0.082 Ma. This sample was collected by Anthony Koppers (akoppers@ceoas.oregonstate.edu). Sample Description: Standard + heavy liquid separation.. Sample Treatment: Fine-grained, avesicular basalt. Moderately altered GM, moderately plag-phyric, sparsely bt-phyric. Trachyte composition unconfirmed - assumed based on mineralogy..
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