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Geology tracks eruptions, earthquakes, erosion, extinctions & more
Date:7/12/2013

f 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 Tuff magma reservoir (Colorado, United States) as a function of absolute time. Systematic compositional variations in U-Pb dated zircons record ~440 thousand years 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 171 plus or minus 58 thousand years prior to eruption, and led to the generation of ~5000 cubic kilometers of eruptible crystal-rich (~45 vol%) dacite. Age-equivalent, but compositionally different, zircons in an andesite enclave from late-erupted Fish Canyon Tuff tie 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.


Thermal decomposition along natural carbonate faults during earthquakes
Cristiano Collettini et al., Dipartimento di Scienze della Terra, Universit di Perugia, Piazza dell'Universit 1, Perugia 06123, Italy; and Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy. First published on 28 June 2013, http://dx.doi.org/10.1130/G34421.1

Theory and laboratory experiments propose that fault lubrication during earthquakes is generated by physico-chemical processes triggered by a tem
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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