Page 50 - Caldera Volcanism Analysis, Modelling and Response

Residence Times of Silicic Magmas Associated with Calderas 25

Rb-Sr isochron age Oldest ages Magma residence Time from Magma
time a di¡usion modeling production rate
3
km y 1 (vol/
residence
time)

30–200 ky [R97] o1 10 6

2777124 ka [H&D97] b 167 ky [H&D97] o1 10 5
b
257739 ka [H02] 33–150 ky [H02]
b 5
2777124 ka [H&D97] , 177 ky [H&D97], ca. o1 10
188741 ka–2777124 ka 88–125 ky [R97], up
b
257739 ka [H02] to 160 ky [H02]
Up to 50 ky [H02] 8 10 5

1.4–2.5 Ma (Early BT, 2.370.3 Ma ca. 1.1 My [vdB&S95], o10 ky 1.4 10 3 [C&D93],
[C&H96]), ca. 1.0 Ma [vdB&S95], ca. ca. 300 ky [C&H96], [H&D92], 100 ky– 0.4–0.75 10 2
3
(Late and intermediate 210 Ma [R&C00], ca. 390 ky [D&H98], 1 My [A00],o10 ky [D&H98], 2 10 –
BT [C&H96]), 0.77– 3.771.00 Ma ca. 100 ky [R&C00], [B&W02], 114 ky 1 10 2 [S&R05]
1.15 Ma (feldspars, [W01] 50–80 ky [S&R05] [M&B06]o100 y
[D&H98]) [W07]

3
0.75 10 [D94 and
D&H98]
b 5
1.1470.08 Ma [H89] , 0.35 My o1 10
1.1570.01 Ma [H89], 0.36 My
b
[D&H98] , 0.77–1.08 Ma [D&H98], 190 ky
(feldspars, [D&H98]) [S&R05]
b 4
1.0970.03 Ma [D&H98] , 1.4-2.1 Ma [S&R05] o17 ky [S&R05], up to o2 10
0.84–1.01 Ma (feldspars, 0.3 My [D&H98]
[D&H98])
2.0970.06 Ma [H89] , b 0.7 My [H89], 0.36 My o1 10 5
b
2.04770.013 Ma [D94] [D94], up to 170 ky
[S&R05]
1.9070.02 Ma [H89] b 0.5 My [H89], 180 ky o5 10 6
b
1.89470.013 Ma [D94] [D94]
2.0970.06 Ma [H89] , b o170 ky [H89],o50 ky o2 10 5
b
2.04770.013 Ma [D94] [D94],