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Lithosphere highlights: Slab dynamics, the Troodos ophiolite, and the Jurassic Bonanza arc
Date:11/15/2012

e Jurassic arc section on Vancouver Island match that of the Talkeetna arc-crustal section in Alaska, suggesting that the two arcs are correlative and evolved by either forearc erosion above of an east-dipping slab, or slab rollback during west-dipping subduction.


Detrital zircon U-Pb geochronology of Mesozoic sandstones from the Lower Yana River, northern Russia
D. Harris et al., West Virginia University, Geology and Geography, 98 Beechurst Ave, 330 Brooks Hall, P.O. Box 6300, Morgantown, West Virginia 26506-6300, USA. Posted online 26 Oct. 2012; http://dx.doi.org/10.1130/L250.1.

The tectonic history of the large basins of the Arctic and of northern Russia remains poorly understood despite a growing body of research. Sandstone dating is quickly becoming a useful tool for determining depositional timing, which can then be used in tectonic reconstructions. D. Harris and colleagues date sandstones from northern Russia in order to determine timing of deposition and thus proximity to their source areas at specific intervals during the tectonic evolution of northern Russia. Their results add to a growing database of sandstone ages in the Arctic, support previous models regarding movement pathways for some of the large landmasses surrounding the Arctic, and suggest that a fault currently interpreted as a suture between two separate terranes is more likely not to be a suture after all.


Stalled slab dynamics
E. Burkett and M. Gurnis, Seismological Laboratory, California Institute of Technology, Pasadena, California 91001, USA. Posted online 26 Oct. 2012; http://dx.doi.org/10.1130/L249.1.

Seismic imaging of the Earth's upper mantle, particularly beneath Western North America where data coverage is unprecedented, has revealed complexities interpreted as structures ran
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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