Page 56 - Caldera Volcanism Analysis, Modelling and Response

Residence Times of Silicic Magmas Associated with Calderas 31

for and and and 8001C) [H&D92],
used Qtz in Qtz in Qtz in (at quartz. (2002).
elements isotopes 7001C) isotopes 7001C) isotopes 7001C) San in Qtz, al. et

and O (at O (at O (at Sr sanidine, Wolff [W02],
Mineral di¡usion calc. [W02] San [W02] San [W02] San [H&D92] San, (2001),

modeling [W02] [W02] calc., =calculation, al. et

from y y y [W02]o10 ky [H&D92] Winick

Time di¡usion 1–200 1–200 1–200 rock equivalent. [W01],
system. dense (1996), al.

Valles-Toledo Oldest ages 14.6071.50 Ma [W01] 11.5470.87 Ma [W01] in Volumes et Self [Se96],

the Vol, (1996),
of age [P03] [S96] given. al.
rates K--Ar 1.55070.008 Ma 1.21270.007 Ma are et Spell
process 1.212 Ma70.006 Ma 1.25670.009 Ma 1.61170.008 Ma former the [S96],

and 40 Ar/ 39 Ar or (eruption) [S96] From to [S96] only (2003),
times available al. et

data, [Se96] [Se96] are Phillips

age (km 3 ) Vol 250 400 ages K–Ar [P03],
volumes, and (1992),

Units, Bandelier Tshirege or Toledo Bandelier Otowi or 40 Ar/ 39 Ar Dunbar

7 V alles/T oledo system Upper Tuff member Rhyolites Lower Tuff member both If and
Table Cerro Note: Hervig