Table 1.

Results for the three-stage model applied to zircon Z2

	Th/Uorig = 0.5 and ɸUE = 2	Th/Uorig = 0.5 and ɸUE = 5	Th/Uorig = 1 and ɸUE = 2	Th/Uorig = 1 and ɸUE = 5
Domain	Age of alteration (Ma)	Age of alteration (Ma)	Age of alteration (Ma)	Age of alteration (Ma)
Z2_1	314	139	209	88
Z2_2	67	27	21	9
Z2_3	261	112	174	73
Z2_14	312	131	150	61
Z2_15	181	74	121	49
Avg. alteration age	227	97	135	56

Th/U_orig stands for the pre-alteration Th/U of the zircon and ɸUE is the uranium enrichment factor of the zircon due to alteration