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Geosphere adds 2 new special issue themes
Date:4/1/2013

emplaced in the course of these eruptions are found as much as 100 miles from their sources and are as much as 300 feet thick. As a result of geologically instantaneous withdrawals of such huge volumes of magma from the crust, collapse depressions, or calderas, formed over the evacuated magma chambers. The largest was 35 miles across and 3 miles deep -- as big as the better known Yellowstone caldera. These calderas are no longer evident in the landscape because of obliteration by millions of years of faulting and erosion, but the vast ignimbrite layers still reveal the enormity of these events.


Alteration of volcanic deposits in the ANDRILL AND-1B core: Influence of paleodeposition, eruptive style, and magmatic composition
Alessio Di Roberto et al., Istituto Nazionale di Geofisica e Vulcanologia, sezione di Pisa, Via della Faggiola, 32-56126 Pisa, Italy. Issue: April 2013. Originally posted online 6 March 2013; http://dx.doi.org/10.1130/GES00812.1 Themed issue: "The ANDRILL McMurdo Ice Shelf (MIS) AND Southern McMurdo Sound (SMS) Drilling Projects"

Alessio Di Roberto and colleagues studied alteration minerals, assemblages, and textures in a 175-m-thick volcanic sequence found between 759.32 and 584.19 m below seafloor within the 1285-m-long ANDRILL (Antarctic Geological Drilling project) McMurdo Ice Shelf core (MIS AND-1B). They identified three main alteration zones through the application of different analytical methods (optical and scanning electron microscopy, electron microprobe, and X-ray diffraction). Alteration zoning is guided by the texture of the volcanic deposits, which is in turn determined by the eruptive style, transport mechanisms, and paleodepositional conditions. In particular, alteration reflects the evolution of paleodepositional conditions from submarine or shallow water to subaerial due to the growth of a nearby volcanic edifice. The genera
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Contact: Kea Giles
kgiles@coyotesong.com
Geological Society of America
Source:Eurekalert

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