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GSA Bulletin: From Titan to Tibet
Date:11/27/2012

n Formation. Mafic dikes (about 419 million years old) intrude previously folded strata attributed to the allochthon as well as the autochthonous Cambrian-Ordovician Albee Formation and Ordovician Ammonoosuc Volcanics. The 443-million-year-old Lost Nation pluton produces hornfels in previously deformed Albee. A 492-million-year-old tonalite intrudes the Albee, formerly interpreted as Silurian rocks of the allochthon. Silurian allochthonous rocks are restricted to a 25-square-kilometer klippe emplaced by hard rock thrusting in post-Emsian Devonian. Correlation along strikes to the northeast of the Albee with the Dead River Formation suggests that the Albee is of Ganderian affinity and that the Bronson hill magmatic arc in the Upper Connecticut Valley was built on Ganderian crust. Some of the pre-Silurian deformation in the Upper Connecticut Valley may be Penobscottian rather than Taconian.


The long-term topographic response of a continent adjacent to a hyperextended margin: A case study from Scandinavia
T.F. Redfield (corresponding) and P.T. Osmundsen, Geological Survey of Norway, N-7491 Trondheim, Norway. Posted online 21 November 2012; http://dx.doi.org/10.1130/B30691.1

Important advancements in our understanding of how continents break apart have been made throughout the past decade. Most recently it has been recognized that the story does not end with the beginning of sea floor spreading and the formation of oceanic crust. In this paper, T.F. Redfield and P.T. Osmundsen document "teleconnections," or far-field communications, between the faults that were responsible for pre-breakup crustal thinning and the landscapes that adorn the uplifted edge of today's Scandinavian continent. They show that the manner in which Scandinavian landscapes evolved (and continue evolving) was (and is) directly related to the width of the zone over which the crystalline contine
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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