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Date:4/23/2013

assen region. Park and Ostos estimate ~7% magma in the overlying mantle wedge from its average electrical conductivity. Several conductive bodies are also found in the crust and located beneath surface expressions of recent eruptions; they infer that these are the magma chambers.


Quaternary landscape evolution over a strike-slip plate boundary: drainage network response to incipient orogenesis in Sakhalin, Russian far east
Uisdean Nicholson (David Macdonald, corresponding author) et al., School of Geosciences, University of Aberdeen, Aberdeen AB24 3UE, UK. Published online 4 Apr. 2013; http://dx.doi.org/10.1130/GES00883.1.

In some parts of Earth, the tectonic plates move past each other horizontally, creating large strike-slip faults. The best-known strike-slip boundary in the world is the San Andreas fault of California, but on the other side of the Pacific, San Andreas has a mirror image on the Russian island of Sakhalin, where the Sakhalin-Hokkaido Shear Zone forms part of the boundary between the North American and Eurasian plates. This shear zone has two main differences with San Andreas. First, it moves much slower than San Andreas at about one tenth of the rate. Second, the Amur River has deposited a delta across the shear zone. The Amur is the tenth largest river on earth, and the delta is large -- 220 km across -- with a sediment accumulation that is up to 5 km thick. This has created a new flat landscape in the north of Sakhalin, giving us an unrivalled opportunity to study the development of hills and the response of rivers to oblique compression on a strike-slip plate boundary over the past 3 million years. This lack of landscape inheritance is very rare in active deformation, so we can study the very early stages of mountain building.


Magnetostratigraphic importance of secondary chemical remanent magnetizations carried by greig
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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