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Abstract Details

(2020) The Ferrar Continental Flood Basalt: A ~1.6 Ma Long Duration Evidenced by High-Precision 40Ar/39Ar Ages

Ware B, Jourdan F, Chiaradia M & Nebel O

https://doi.org/10.46427/gold2020.2811

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06n: Room 2, View in program

Listed below are questions that have been submitted by the community that the author will try and cover in their presentation. To submit a question, ensure you are signed in to the website. Authors or session conveners approve questions before they are displayed here.

Submitted by Yuri Amelin on
Are there rocks in the Ferrar province where both zircon U-Pb and plagioclase 40Ar/39Ar dates are obtained? If yes, how do they compare to each other?

Submitted by Yankun Di on
Do you have a temperature estimate of the magma evolution? Can the K-Ar systems in plagioclase be closed to record ages before zircon saturation?

Submitted by Matthew Heizler on
Enjoyed your presentation. If you have a 70%-30% mixture of compositionally different plagioclase grains, this should be readily determined by microprobe analyses of your bulk mineral separation - do you observe this? Have you considered a fractionation model for 40Ar relative to 39Ar to explain your climbing spectra? This is commonly observed in sanidine age spectra and it would predict 1-2 Ma age difference from initial heating steps to the final heating steps. This would not predict the differences between the samples, thus I agree you likely are seeing a spread in apparent ages of bulk samples. Lastly, Yuri's question is a good one. You show a model argon loss spectra for a 185 Ma plagioclase. Did you use a reasonable thermal history that would allow dissolution of older zircons, but only minor argon loss?

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