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Reinterpreting origins, examining skeletal preservation, and understanding volcanics
Date:12/19/2013

make it the ideal island to focus the study. We analyzed the relationships between tectonics and magmatism, using different field and laboratory analyses. The morphology of the island is dominated by WNW-ESE major faults with oblique motion and NE-SW opening, probably related to the nearby transtensive Terceira Rift. Most of magmatic and tectonic features of the island are parallel to this system. Our field data allow to estimate the mean extension rate (between 3.4 and 8.2 mm/yr), which is similar or slightly larger than that of Terceira Rift. Part of the extension may be magma induced. We suggest that Faial, along with the nearby Pico Island, is a major locus of extension within the Azores and constitutes the offset, westward magmatic continuation of the Terceira Rift. The results of this study highlighted the importance of how extensional deformation along transtensive plate boundaries may influence volcanic activity.


Compaction and gas loss in welded pyroclastic deposits as revealed by porosity, permeability, and electrical conductivity measurements of the Shevlin Park Tuff
Heather M. Wright, U.S. Geological Survey, MS 910, 345 Middlefield Road, Menlo Park, California 94025, USA hwright@usgs.gov; and Katharine V. Cashman. Posted online ahead of print on 13 Dec. 2013; http://dx.doi.org/10.1130/B30668.1.

Explosive volcanic eruptions can produce pyroclastic flows, gravity-driven currents of hot volcanic gas and pyroclastic rocks. When these flows stop moving, they form deposits of pyroclastic material (pyroclastic-flow deposits) by losing gas (decreasing pore space) and compacting (densifying). In some cases, the pyroclastic material is sufficiently hot and the thickness of the deposit is great enough that the particles anneal to each other, a process called "welding." Here, Heather Wright of the U.S. Geological Survey and co
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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