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Swiss Journal of Geosciences
Fig. 7. | Swiss Journal of Geosciences

Fig. 7.

From: Mid-Cretaceous extensional magmatism in the Alborz Mountains, north Iran; geochemistry and geochronology of Gasht-Masuleh gabbros

Fig. 7.

40Ar/39Ar incremental step heating age spectra, Ca/K ratios and fractions (%) of the radiogenic.40Ar of magmatic phlogopite of cumulate samples A 16FMN20A (Zudel intrusion) and B 16FMN45A (Gilvanderud intrusion) yielding plateau ages. C A forced plateau age (*) for 2 gas fractions of step 5–6 was calculated for phlogopite from 15FMN05A (Chapul intrusion)

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