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

Fig. 7

From: A step towards unraveling the paleogeographic attribution of pre-Mesozoic basement complexes in the Western Alps based on U–Pb geochronology of Permian magmatism

Fig. 7

a, b Tera-Wasserburg diagrams (207Pb/206Pb vs. 238U/206Pb) with the data obtained on zircon grains extracted from the Guil volcanics (sample BR 15-01) and the microdioritic sill (sample HL 15-01). c, d Tera-Wasserburg diagrams for the apatite grains from the same samples. The red discordia lines were obtained with a free regression of the data while the black discordia lines were obtained by forcing the regression to a (207Pb/206Pb)0 value of 0.855 obtained using the Stacey and Kramers Pb evolution model (1975) for an age of ca. 295 Ma

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