Supplementary Data Table 1. Ar-Ar analytical data of the Sample G2, Bufa Formation (ignimbrite).
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1 Supplementary Data Table 1. Ar-Ar analytical data of the Sample G2, Bufa Formation (ignimbrite). Sample G2. Laser step-heating experiments with feldspar concentrate Long. W Lat. N Pwr 39 Ar 10-6 % 39 Ar 40 Ar*/ 39 Ar K 1 Age (Ma) 1 % 40 Ar* 40 Ar/ 36 Ar 37 Ar Ca / 39 Ar K a b c d e f g h i j k l m n o Integrated results 39 Ar Ar*/ 39 Ar K 1 Age (Ma) 1 % 40 Ar* 40 Ar/ 36 Ar 37 Ar Ca / 39 Ar K CIC 71 RIII J = ± t p = ± 0.48 Ma; weighted mean of fractions g to m and o, representing 99.18% of 39 Ar released in 8 fractions, MSWD = 0.64 t c = ± 0.46 Ma; ( 40 Ar/ 36 Ar) i = 297 ± 11, MSWD = 0.95 for n = 14 fraction ignored in the isochron given in the figure Note: The integrated results for the second experiment are given for comparison. It is necessary to take in account that these results are not accurate since for fraction n was very close in size to the blank, therefore for this fraction mass 36 is not reliable and no age information can be reported. However, since this is a very small fraction with only ~0.82% of the 39 Ar released, it has very little effect in the integrated results.
2 Supplementary Data Table 2. Ar-Ar analytical data of the Sample G5, Calderones Formation (ignimbrite) Sample G5. Laser step-heating experiments with plagioclase concentrate Long. W Lat. N Pwr 39 Ar 10-6 % 39 Ar 40 Ar*/ 39 Ar K 1 Age (Ma) 1 % 40 Ar* 40 Ar/ 36 Ar 37 Ar Ca / 39 Ar K a b c d e f g h i j k l m n o Integrated results 39 Ar Ar*/ 39 Ar K 1 Age (Ma) 1 % 40 Ar* 40 Ar/ 36 Ar 37 Ar Ca / 39 Ar K CIC 71 B J = ± t p = ± 0.29 Ma; weighted mean of fractions f to h representing 52.31% of 39 Ar released in 3 consecutive fractions, MSWD = 0.13 t c = ± 0.35 Ma; ( 40 Ar/ 36 Ar) i = 313 ± 8, MSWD = 6 for n = 12 fraction ignored in the isochron given in the figure.
3 Supplementary Data Table 3. Zircon U/Pb ICPMS Laser Ablation analytical data of the dated samples. SAMPLE U Th T/U G-1 Zircon_G01-32_043_ Zircon_G01-24_033_ Zircon_G01-3_008_ Zircon_G01-13_020_ Zircon_G01-14_021_ Zircon_G01-20_028_ Zircon_G01-36_048_ Zircon_G01-40_052_ Zircon_G01-17_025_ Zircon_G01-22_031_ Zircon_G01-5_010_ Zircon_G01-15_022_ Zircon_G01-35_046_ Zircon_G01-6_012_ Zircon_G01-12_019_ Zircon_G01-29_039_ Zircon_G01-16_024_ Zircon_G01-39_051_ Zircon_G01-23_032_ Zircon_G01-30_040_ Zircon_G01-37_049_ Zircon_G01-4_009_ Zircon_G01-1_006_ Zircon_G01-8_014_ Zircon_G01-27_037_ Zircon_G01-38_050_ CED-4 Zircon_10_ Zircon_11_ Zircon_13_ Zircon_14_ Zircon_15_ Zircon_16_ Zircon_18_ Zircon_19_ Zircon_20_ Zircon_22_ Zircon_23_ Zircon_24_ Zircon_25_ Zircon_26_ Zircon_27_ Zircon_28_
4 U Th T/U CED-4 cont. Zircon_3_ Zircon_30_ Zircon_33_ Zircon_34_ Zircon_35_ Zircon_36_ Zircon_37_ Zircon_38_ Zircon_39_ Zircon_4_ Zircon_40_ Zircon_5_ Zircon_6_ Zircon_7_ Zircon_2_ Zircon_8_ Zircon_9_ CED-5B Zircon_8_ Zircon_14_ Zircon_23_ Zircon_24_ Zircon_21_ Zircon_32_ Zircon_20_ Zircon_3_ Zircon_10_ Zircon_15_ Zircon_30_ Zircon_27_ Zircon_5_ Zircon_12_ Zircon_19_ Zircon_25_ Zircon_39_ Zircon_22_ Zircon_33_ Zircon_1_ Zircon_18_ Zircon_34_ Zircon_4_ Zircon_11_ Zircon_9_ Zircon_35_
5 U Th T/U CED-5B cont. Zircon_6_ Zircon_7_ Zircon_28_ Zircon_37_ Zircon_38_ Zircon_13_ Zircon_16_ JBCAL-1 Zircon_17_ Zircon_18_ Zircon_06_ Zircon_04_ Zircon_75_ Zircon_32_ Zircon_48_ Zircon_12_ Zircon_47_ Zircon_53_ Zircon_11_ Zircon_13_ Zircon_23_ Zircon_20_ Zircon_21_ Zircon_61_ Zircon_34_ Zircon_35_ Zircon_43_ Zircon_49_ Zircon_54_ Zircon_76_ Zircon_57_ Zircon_19_ Zircon_55_ Zircon_64_ Zircon_65_ Zircon_68_ Zircon_31_ Zircon_39_ Zircon_01_ Zircon_15_ Zircon_59_ Zircon_60_ Zircon_03_ Zircon_66_
6 U Th T/U JBCAL-1 cont. Zircon_78_ Zircon_28_ Zircon_40_ Zircon_44_ Zircon_62_ Zircon_69_ Zircon_79_ Zircon_02_ Zircon_58_ Zircon_36_ Zircon_70_ Zircon_38_ Zircon_45_ Zircon_33_ Zircon_63_ Zircon_73_ Zircon_41_ Zircon_08_ Zircon_37_ Zircon_29_ Zircon_25_ Zircon_77_ Zircon_05_ Zircon_24_ RCHI-2 Zircon_12_ Zircon_23_ Zircon_07_ Zircon_34_ Zircon_02_ Zircon_16_ Zircon_36_ Zircon_27_ Zircon_08_ Zircon_21_ Zircon_13_ Zircon_15_ Zircon_19_ Zircon_26_ Zircon_31_ Zircon_29_ Zircon_04_ Zircon_06_ Zircon_14_
7 U Th T/U RCHI-2 cont. Zircon_18_ Zircon_33_ Zircon_37_ Zircon_22_ Zircon_11_ Zircon_05_ Zircon_20_ Zircon_30_ Zircon_10_ Zircon_35_ Zircon_01_ Zircon_24_ Zircon_28_ Zircon_39_ M-1 Zircon_M01-15_022_ Zircon_M01-20_028_ Zircon_M01-19_027_ Zircon_M01-4_009_ Zircon_M01-37_049_ Zircon_M01-24_033_ Zircon_M01-14_021_ Zircon_M01-30_040_ Zircon_M01-13_020_ Zircon_M01-16_024_ Zircon_M01-10_016_ Zircon_M01-33_044_ Zircon_M01-5_010_ Zircon_M01-7_013_ Zircon_M01-1_006_ Zircon_M01-23_032_ Zircon_M01-40_052_ Zircon_M01-17_025_ Zircon_M01-18_026_ Zircon_M01-12_019_ Zircon_M01-21_030_ Zircon_M01-25_034_ Zircon_M01-34_045_ Zircon_M01-32_043_ Zircon_M01-3_008_ Zircon_M01-6_012_ Zircon_M01-9_015_ Zircon_M01-11_018_ Zircon_M01-27_037_
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