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GSA Bulletin: Rock avalanches, ancient weather, astronomical clocks, anoxia, and volcanism
Date:4/4/2014

er part of the Whakamaru Group (termed the Paeroa Subgroup) indicates that these ignimbrites erupted in non-energetic manner, and from a linear vent zone source. This Paeroa linear vent zone coincides with the preset-day Paeroa Fault, and eruptions are speculated to have occurred in a fissure style. No caldera has been identified for such a large eruption, and collapse maybe concealed as fault related movement and/or collapse in adjacent calderas. Downs and colleagues note that the results of this study demonstrate the need for intensive field studies in volcanic areas, and that structural controls may play an as yet unknown role in controlling vent locations and eruptive styles.


Mid-Miocene rhyolite volcanism in northeastern Nevada: The Jarbidge Rhyolite and its relationship to the Cenozoic evolution of the northern Great Basin (USA)
Matthew E. Brueseke et al., Department of Geology, Kansas State University, 108 Thompson Hall, Manhattan, Kansas 66506, USA. Published online 1 Apr. 2014; http://dx.doi.org/10.1130/B30736.1.

This study of the Jarbidge Rhyolite by Matthew E. Brueseke and colleagues focuses on understanding the occurrence and cause of widespread mid-Miocene felsic volcanism in the northern Great Basin, USA. Physical characteristics, whole rock geochemistry, 40Ar/39Ar geochronology, and oxygen isotope data indicate that at least 500 cubic kilometers of primarily phenocryst-rich rhyolite lavas erupted 15 to 16.1 million years ago in the vicinity of the Jarbidge Mountains (Nevada). Brueseke and colleagues interpret the distribution of the Jarbidge Rhyolite in northeastern Nevada to reflect an intimate association with temporally and spatially coincident extension that resulted from the rapid collapse of the Nevadaplano high plateau approx. 17 to 16 million years ago, rather than the Yellowstone hotspot and its interaction with North America.


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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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GSA Bulletin: Rock avalanches, ancient weather, astronomical clocks, anoxia, and volcanism
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