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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Tracking the evolution of large-volume silicic magma reservoirs from assembly to supereruption
Geology, Volume 41, No. 8, Year 2013
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Description
The most voluminous silicic volcanic eruptions in the geological past were associated with caldera collapses above giant silicic magma reservoirs. The thermal evolution of these subcaldera magma reservoirs controls the volume of eruptible magma and eruptive style. Here we combine high-precision zircon U-Pb geochronology, trace element analyses of the same mineral grains, and mass balance modeling of zircon trace element compositions allowing us to track the thermal and chemical evolution of the Oligocene Fish Canyon Tuffmagma reservoir (Colorado, United States) as a function of absolute time. Systematic compositional variations in U-Pb dated zircons record ~440 k.y. of magma evolution. An early phase of volumetric growth was followed by a period of cooling and crystallization, during which the Fish Canyon magma approached complete solidification. Subsequent remelting, due to underplated andesitic recharge magmas, began 219 ± 45 k.y. prior to eruption, and led to the generation of ~5000 km3 of eruptible crystal-rich (~45 vol%) dacite. Age-equivalent, but compositionally different, zircons in an andesite enclave from late-erupted Fish Canyon Tufftie the growth and thermal evolution of the upper-crustal reservoir to a lower-crustal magma processing zone. Our results demonstrate that the combination of high-precision dating and trace element analyses of accessory zircons can reveal invaluable information about the chemical and thermal histories of silicic magmatic systems and provides critical input parameters for fluid dynamic modeling. © 2013 Geological Society of America.
Authors & Co-Authors
Wotzlaw, Jörn Frederik
Switzerland, Geneva
Université de Genève
Schaltegger, Urs
Switzerland, Geneva
Université de Genève
Frick, Daniel A.
Switzerland, Zurich
Laboratorium Für Anorganische Chemie
Dungan, Michael A.
Switzerland, Geneva
Université de Genève
United States, Eugene
University of Oregon
Gerdes, A. G.
Germany, Frankfurt am Main
Goethe-universität Frankfurt am Main
South Africa, Stellenbosch
Stellenbosch University
Günther, Detlef
Switzerland, Zurich
Laboratorium Für Anorganische Chemie
Statistics
Citations: 212
Authors: 6
Affiliations: 5
Identifiers
Doi:
10.1130/G34366.1
ISSN:
00917613
e-ISSN:
19432682