U–Pb geochronology of detrital zircons from a contact metamorphic Brixen Quartzphyllite (South-Tyrol, Italy): evidence for a complex pre-Variscan evolution of the Southalpine basement

Swiss Journal of Geosciences

Table 2 Geochronological results

²⁰⁷Pb/²³⁵U	1σ	²⁰⁶Pb/²³⁸U	1σ	ρ	²⁰⁷Pb/²⁰⁶Pb	1σ	Single age	Age
0.8733	0.0476	0.1044	0.0044	0.38	0.0601	0.0018	639 ± 21
0.9060	0.0909	0.0993	0.0099	0.50	0.0651	0.0015	640 ± 45	638 ± 20
0.9320	0.0713	0.0994	0.0072	0.47	0.0645	0.0011	–
1.4478	0.0594	0.1482	0.0062	0.51	0.0701	0.0008	906 ± 24
1.3160	0.1761	0.1369	0.0103	0.28	0.0714	0.0033	835 ± 53
1.2807	0.1238	0.1445	0.0137	0.49	0.0637	0.0007	843 ± 53	882 ± 19
1.3414	0.1433	0.1404	0.0147	0.49	0.0677	0.0008	860 ± 60
1.2954	0.2836	0.1194	0.0170	0.33	0.0644	0.0048	759 ± 90
1.5593	0.1260	0.1727	0.0137	0.49	0.0632	0.0010	–
6.1915	0.3503	0.3539	0.0199	0.50	0.1232	0.0005	2,002 ± 50
6.1378	0.5703	0.3683	0.0362	0.53	0.1242	0.0014	1,995 ± 81	2023 ± 31
6.5625	0.4473	0.3587	0.0240	0.49	0.1313	0.0009	2,052 ± 60
6.5236	0.4849	0.3768	0.0277	0.49	0.1240	0.0007	–