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40Ar/39Ar Age Determination 16D10472 (IESS10074 - Humpback Seamount)
File Name IESS10074.16D10472.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.7.0
File Size 1.11 MB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Susan Schnur
Source http://earthref.org/ERDA/IESS10074/
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample MV1203-D20B-05 from Humpback Seamount in Walvis Ridge and was calculated using the ArArCALC freeware. The preferred age of 4.25 ± 0.00 Ma is the age plateau and is interpreted as the eruption age of the sample. Slight upward slant with low and high-T plateaus. High-T plateau selected in this case. The age determination was carried out on a sample of phonolite (k-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 (7A36-15) (sanidine) with an age of 28.201 ± 0.082 Ma. This sample was collected by Anthony Koppers (akoppers@ceoas.oregonstate.edu). Sample Description: Standard. Sample Treatment: Aphanitic, moderately vesicular basalt. Moderately altered GM, moderately cpx-phyric, sparsely ol-hbl-phyric..
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