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Detailed File Information
40Ar/39Ar Age Determination 15D04625 (IEKK1-FH-OM-01 - Marquesas Islands)
File Name IEKK1-FH-OM-01.15D04625.pdf
Data Type spreadsheet
Computer Program ArArCALC 2.7.0
File Size 1.42 MB - 4 files [ pdf,xls,age,xml ]
Expert Level State-of-the-art Science
Contributor Kevin Konrad
Source Konrad et al. 2018
http://earthref.org/ERDA/IEKK1-FH-OM-01/
Description
This upload contains the 40Ar/39Ar geochronology age determination of sample FH-OM-1 from Marquesas Islands in French Polynesia and was calculated using the ArArCALC freeware. The preferred age of 1.5365 ± 0.0047 Ma is the age plateau and is interpreted as the eruption age of the sample. The plateau began with typical recoil step pattern, which continually decreases in apparent age. Then the age leveled off, producing a long plateau. The highest temperature steps display a dramatic decrease in both apparent age and K/Ca indicating high temperature recoil and degassing of pyroxene and olivine in the groundmass. The age determination was carried out on a sample of basalt (groundmass) in an incremental heating experiment and using the in situ 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 (R98) (4C22-14) (sanidine) with an age of 28.201 ± 0.082 Ma. This sample was collected by Kevin Konrad (Konradke@oregonstate.edu). Sample Description: 1x leach. Sample Treatment: Individual handsample from the Marquesas Islands. . Location Description: Omoa Bay, Fatu Hiva Island, Marquesas Islands, French Polynesia. Lat/Long/Elevation is approximate. .
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