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GEOLOGY starts 2013 with 25 new articles posted online ahead of print
Date:1/30/2013

ssure eruption with four associated vents, the shallowest topping at only 89 m of water depth. Despite the fact that the eruption added about 0.006% to the volume of the overall edifice only, the shallow depth reached by the growing volcano raised serious concern since shallow water volcanism may lead to explosive eruptions and tsunami generation. This small, geologically frequent growth episode contrasts with the destruction by large-scale catastrophic flank collapses that affect most volcanic islands. The most recent giant debris avalanche in El Hierro, which occurred 13 to 134-thousand ago, mobilized in a single event a volume equivalent to 450 to 550 eruptions similar in size to the one described. This seems to be the fate of ocean islands.


Synchronous vertical and horizontal tectonism at late stages of Archean cratonization and genesis of Hemlo gold deposit, Superior craton, Ontario, Canada
Shoufa Lin, Dept. of Earth and Environmental Sciences, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada; and School of Resources and Environment, Hefei University of Technology, Hefei 230026, P.R. China; and Gary P. Beakhouse. Posted online 4 Jan. 2013; http://dx.doi.org/10.1130/G33887.1.

The tectonic processes in modern Earth are characterized by large scale horizontal motion (plate tectonics, a form of horizontal tectonism), whereas those at the early stages of Earth's evolution were probably very different and dominated by vertical motion (vertical tectonism). The transition from dominant vertical to dominant horizontal tectonism took place about 2.7 to 2.6 billion years ago in the Superior craton in Canada and is characterized by the synchronous and interactive operation of vertical and horizontal tectonism. Such a transitional process is important for gold mineralization. The world-class Hemlo gold deposit in Ontario (containing more than 700 tons of gold) formed
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Contact: Kea Giles
kgiles@geosociety.org
303-357-1057
Geological Society of America
Source:Eurekalert  

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