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

ural style characteristic of normal fault displacement across the STFS. Peak temperatures in key samples were determined by measuring heat-induced structural reorganization of incorporated organic carbonaceous material. Their results show a drop in peak temperature of about 140 degrees Celsius that coincides with a significant change in observed outcrop-scale deformation 80 km south of the main STFS trace in the direction of fault motion, placing a minimum constraint on STFS displacement of 80 km. This is comparable to displacement estimates on the major thrust faults to the south, suggesting that normal faulting has played a fundamental role, perhaps as important as thrust faulting, in the evolution of the mountain range.

Age, construction, and exhumation of mid-crust of the Jurassic Bonanza arc, Vancouver Island, Canada
D. Canil et al., University of Victoria, School of Earth and Ocean Sciences, 3800 Finnerty Road, Victoria, British Columbia V8W 3P6, Canada http://dx.doi.org/10.1130/L225.1.

Dante Canil and colleagues present new U-Pb zircon ages for heterogeneous mafic-felsic rocks of the West Coast complex, a midcrustal plutonic component of exposed Jurassic arc-crustal section on Vancouver Island. They examine the timing of juvenile plutonic crust production and consanguinity of volcanism and plutonism in this arc. The midcrustal plutons were emplaced between 174 and 193 million years ago, contemporaneous with the upper-crustal (less than 10 km deep) plutonic component of the arc (Island plutonic suite). A 12-km thickness of plutonic arc crust was built as a series of sheets at a rate of about 0.003 cubic kilometers per year. Deformation and emplacement were contemporaneous, and there are no correlations among age, differentiation (peridotite to granite), or structural level of plutons in the arc. The age range and a weak eastward younging age polarity of th
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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